/* Layout: RTL reference library — top bar, content column; reader = toc | text | assistant */
:root{
  --paper:#F5F6F2; --surface:#FFFFFF; --sunk:#ECEEE8; --line:#DADDD3;
  --ink:#14211E; --ink-2:#4A5753; --ink-3:#7B8682;
  --accent:#0E6B5A; --accent-soft:#DCEDE7; --accent-ink:#FFFFFF;
  --saffron:#C98A12; --saffron-soft:#F6EAD0;
  --plum:#6A4C93; --plum-soft:#ECE5F4;
  --ok:#2E7D4F; --warn:#B7791F; --idle:#8A938F;
  --code-bg:#0F1A18; --code-fg:#DDE7E3;
  --f-display:"Lalezar","Vazirmatn",system-ui,sans-serif;
  --f-body:"Vazirmatn",Tahoma,system-ui,sans-serif;
  --f-latin:"IBM Plex Sans",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --r:10px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0E1513; --surface:#141D1B; --sunk:#1A2522; --line:#26332F;
  --ink:#E6ECE9; --ink-2:#AAB6B2; --ink-3:#7E8A86;
  --accent:#4FC2A6; --accent-soft:#163A32; --accent-ink:#06201A;
  --saffron:#E5AE45; --saffron-soft:#3A2E14; --plum:#B39AD8; --plum-soft:#2D2440;
  --code-bg:#0A100F; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0E1513; --surface:#141D1B; --sunk:#1A2522; --line:#26332F;
  --ink:#E6ECE9; --ink-2:#AAB6B2; --ink-3:#7E8A86;
  --accent:#4FC2A6; --accent-soft:#163A32; --accent-ink:#06201A;
  --saffron:#E5AE45; --saffron-soft:#3A2E14; --plum:#B39AD8; --plum-soft:#2D2440;
  --code-bg:#0A100F; color-scheme:dark}

*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.wrap{max-width:1240px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.ltr{direction:ltr;font-family:var(--f-latin);unicode-bidi:isolate}
.num{font-variant-numeric:tabular-nums}

/* top bar */
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:24px;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-family:var(--f-display);font-size:26px;line-height:1}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);display:grid;place-items:center}
.brand small{display:block;font-family:var(--f-body);font-size:11px;color:var(--ink-3);margin-top:4px}
.nav{display:flex;gap:4px}
.nav a{color:var(--ink-2);padding:8px 12px;border-radius:8px;font-weight:500;font-size:14px}
.nav a:hover{background:var(--sunk);text-decoration:none}
.nav a.on{color:var(--ink);background:var(--sunk)}
.search{margin-inline-start:auto;display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:0 12px;height:38px;width:300px;color:var(--ink-3)}
.search input{border:0;background:none;outline:none;flex:1;font:inherit;color:var(--ink);min-width:0}
.kbd{font-family:var(--f-latin);font-size:11px;border:1px solid var(--line);border-radius:5px;padding:1px 6px}
.icon-btn{background:none;border:1px solid var(--line);border-radius:9px;width:38px;height:38px;display:grid;place-items:center;color:var(--ink-2)}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--saffron-soft);color:var(--saffron);display:grid;place-items:center;font-weight:700}

/* type */
h1,h2,h3{text-wrap:balance;margin:0}
.display{font-family:var(--f-display);font-weight:400;letter-spacing:0;line-height:1.25}
.eyebrow{font-size:12px;font-weight:600;color:var(--accent);letter-spacing:.02em}
.muted{color:var(--ink-2)}
.faint{color:var(--ink-3);font-size:13px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:9px;padding:10px 18px;font-weight:600;border:1px solid transparent;font-size:14px}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:2px 10px;border-radius:99px;background:var(--sunk);color:var(--ink-2);white-space:nowrap}
.st{width:8px;height:8px;border-radius:50%;display:inline-block;flex:none}
.st-done{background:var(--ok)} .st-review{background:var(--warn)} .st-queued{background:transparent;border:1.5px solid var(--idle)}

/* HOME */
.hero{padding-block:56px 40px;display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:52px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{font-size:17px;color:var(--ink-2);max-width:34em;margin:18px 0 26px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.bili{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 18px 40px -24px rgba(10,40,34,.35)}
.bili-head{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink-3)}
.bili-row{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}
.bili-row:last-child{border-bottom:0}
.bili-row>div{padding:14px 16px;font-size:13.5px;line-height:1.8;min-width:0}
.bili-row .ltr{border-inline-start:1px solid var(--line);color:var(--ink-2);font-size:12.5px;line-height:1.7}
.bili-row.hl>div:first-child{background:var(--accent-soft)}
.bili code{font-family:var(--f-mono);font-size:12px}
.preserve{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.preserve span{font-size:12.5px;border:1px dashed var(--line);border-radius:7px;padding:3px 10px;color:var(--ink-2)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);border-block:1px solid var(--line);margin-bottom:48px}
.stats>div{padding:20px 0;padding-inline-start:20px;border-inline-start:1px solid var(--line)}
.stats>div:first-child{border-inline-start:0;padding-inline-start:0}
.stats b{display:block;font-family:var(--f-display);font-size:32px;font-weight:400;line-height:1.2}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:20px}
.section-head h2{font-size:28px}

.continue{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:48px}
.ring{width:58px;height:58px;flex:none}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:16px;margin-bottom:56px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:12px;color:var(--ink);transition:border-color .15s, transform .15s}
.card:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-2px)}
.card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.org{font-size:12px;color:var(--ink-3)}
.card h3{font-size:19px;font-weight:700;line-height:1.5}
.card .en{font-size:13px;color:var(--ink-3)}
.card p{margin:0;font-size:13.5px;color:var(--ink-2);line-height:1.8}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.bar{height:6px;background:var(--sunk);border-radius:9px;overflow:hidden;display:flex}
.bar i{display:block;height:100%}
.bar .b-done{background:var(--ok)} .bar .b-review{background:var(--warn)}
.card-foot{display:flex;justify-content:space-between;font-size:12px;color:var(--ink-3);margin-top:auto}
.badge-new{font-size:11px;background:var(--saffron-soft);color:var(--saffron);padding:1px 8px;border-radius:99px;font-weight:600}
.spine{width:4px;border-radius:4px;align-self:stretch}
.c-teal{--c:var(--accent);--cs:var(--accent-soft)} .c-saffron{--c:var(--saffron);--cs:var(--saffron-soft)} .c-plum{--c:var(--plum);--cs:var(--plum-soft)} .c-ink{--c:var(--ink);--cs:var(--sunk)}
.glyph{width:44px;height:44px;border-radius:10px;background:var(--cs);color:var(--c);display:grid;place-items:center;font-family:var(--f-latin);font-weight:700;font-size:14px;flex:none}

.how{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:14px;background:var(--surface);margin-bottom:64px}
.how>div{padding:22px;border-inline-start:1px solid var(--line)}
.how>div:first-child{border-inline-start:0}
.how h4{margin:8px 0 6px;font-size:15px}
.how p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.8}
.how .ic{color:var(--accent)}
footer{border-top:1px solid var(--line);padding-block:28px;color:var(--ink-3);font-size:13px}

/* COURSE */
.crumbs{font-size:13px;color:var(--ink-3);padding-top:22px;display:flex;gap:8px;flex-wrap:wrap}
.crumbs a{color:var(--ink-2)}
.course-head{display:grid;grid-template-columns:1fr 320px;gap:40px;padding-block:20px 32px}
.course-head h1{font-size:40px}
.course-head .en-title{font-family:var(--f-latin);color:var(--ink-3);font-size:16px;margin-top:4px}
.meta{display:flex;flex-wrap:wrap;gap:18px;margin-top:18px;font-size:13px;color:var(--ink-2)}
.meta b{color:var(--ink);font-weight:600}
.side-box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:14px;align-self:start}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--ink-2)}
.legend span{display:inline-flex;gap:6px;align-items:center}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}
.tabs button{background:none;border:0;padding:10px 14px;color:var(--ink-2);font-weight:500;border-bottom:2px solid transparent;white-space:nowrap}
.tabs button.on{color:var(--ink);border-bottom-color:var(--accent)}
.part{background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden}
.part-h{display:flex;align-items:center;gap:14px;padding:14px 18px;width:100%;background:none;border:0;text-align:start}
.part-n{font-family:var(--f-latin);font-weight:700;font-size:12px;color:var(--accent);background:var(--accent-soft);border-radius:6px;min-width:36px;text-align:center;padding:2px 6px}
.part-h h3{font-size:16px;font-weight:700}
.part-h .en{font-size:12px;color:var(--ink-3);font-family:var(--f-latin)}
.part-h .count{margin-inline-start:auto;font-size:12px;color:var(--ink-3)}
.chev{transition:transform .2s;color:var(--ink-3)}
.part.open .chev{transform:rotate(-90deg)}
.lessons{border-top:1px solid var(--line)}
.lesson{display:grid;grid-template-columns:28px 44px 1fr auto auto;gap:12px;align-items:center;padding:10px 18px;border-top:1px solid var(--sunk);color:var(--ink)}
.lesson:first-child{border-top:0}
.lesson:hover{background:var(--sunk);text-decoration:none}
.lesson .ln{font-family:var(--f-latin);color:var(--ink-3);font-size:13px}
.lesson .lt{min-width:0}
.lesson .lt div{font-weight:500;font-size:14.5px}
.lesson .lt .ltr{font-size:12px;color:var(--ink-3);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.check{width:20px;height:20px;border-radius:6px;border:1.5px solid var(--line);display:grid;place-items:center;color:transparent;background:var(--surface)}
.check.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.res{display:flex;gap:6px}
.empty-part{padding:14px 18px;color:var(--ink-3);font-size:13px;border-top:1px solid var(--line)}

/* READER */
.reader{display:grid;grid-template-columns:260px minmax(0,1fr) 330px;gap:0;min-height:calc(100vh - 64px)}
.toc{border-inline-end:1px solid var(--line);padding:20px 16px;position:sticky;top:64px;height:calc(100vh - 64px);overflow:auto;font-size:13px}
.toc h4{font-size:12px;color:var(--ink-3);margin:18px 0 8px;font-weight:600}
.toc a{display:flex;gap:8px;align-items:center;color:var(--ink-2);padding:5px 8px;border-radius:7px;line-height:1.6}
.toc a.on{background:var(--accent-soft);color:var(--ink);font-weight:600}
.toc a:hover{text-decoration:none;background:var(--sunk)}
.toc .sub{padding-inline-start:22px;font-size:12.5px}
.article{padding:28px 44px 80px;min-width:0}
.article-in{max-width:760px;margin:0 auto}
.modebar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;position:sticky;top:64px;z-index:5;background:var(--paper);padding-block:10px;border-bottom:1px solid var(--line);margin-bottom:24px}
.seg{display:inline-flex;background:var(--sunk);border-radius:9px;padding:3px}
.seg button{border:0;background:none;padding:5px 14px;border-radius:7px;font-size:13px;color:var(--ink-2)}
.seg button.on{background:var(--surface);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.08);font-weight:600}
.article h1{font-size:34px;margin-top:6px}
.article .entitle{font-family:var(--f-latin);color:var(--ink-3);margin-top:4px}
.prov{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:12.5px;color:var(--ink-3);margin:16px 0 26px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.blk{position:relative;margin-block:0 18px}
.blk .fa{font-size:16.5px;line-height:2.05}
.blk .en{display:none;direction:ltr;font-family:var(--f-latin);font-size:14.5px;line-height:1.75;color:var(--ink-2)}
.mode-orig .blk .fa{display:none}
.mode-orig .blk .en{display:block;color:var(--ink);font-size:15.5px}
.mode-both .blk.pair{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.mode-both .blk.pair .en{display:block;border-inline-start:1px solid var(--line);padding-inline-start:22px}
.mode-both .article-in{max-width:none}
.blk.pair:hover{background:color-mix(in srgb,var(--accent-soft) 45%,transparent);border-radius:8px;outline:6px solid color-mix(in srgb,var(--accent-soft) 45%,transparent)}
.blk.sel{background:var(--accent-soft);border-radius:8px;outline:6px solid var(--accent-soft)}
.ask{position:absolute;inset-inline-end:-36px;top:2px;opacity:0;border:1px solid var(--line);background:var(--surface);border-radius:7px;width:28px;height:28px;display:grid;place-items:center;color:var(--accent)}
.blk:hover .ask,.blk.sel .ask{opacity:1}
.article h2{font-size:22px;margin:34px 0 14px;font-weight:800}
.note{border:1px solid var(--line);border-inline-start:3px solid var(--accent);background:var(--surface);border-radius:8px;padding:12px 16px}
.note.quote{border-inline-start-color:var(--saffron);font-style:normal}
.note .lab{font-size:11.5px;font-weight:700;color:var(--accent);display:block;margin-bottom:2px}
.note.quote .lab{color:var(--saffron)}
.formula{direction:ltr;text-align:center;font-family:"Cambria Math","Latin Modern Math","STIX Two Math",Georgia,serif;font-size:21px;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:10px;margin-bottom:18px;overflow-x:auto}
.formula.rtl{direction:rtl;font-size:17px}
.fig{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:6px}
.fig .ph{min-width:0;min-height:90px;aspect-ratio:16/7;max-width:100%;border-radius:10px;background:repeating-linear-gradient(135deg,var(--sunk) 0 10px,var(--surface) 10px 20px);border:1px solid var(--line);display:grid;place-items:center;color:var(--ink-3);font-size:13px;text-align:center;padding:10px}
.figcap{font-size:12.5px;color:var(--ink-3);text-align:center;margin-bottom:22px}
.code{direction:ltr;background:var(--code-bg);color:var(--code-fg);border-radius:10px;overflow:hidden;margin-bottom:22px}
.code-h{display:flex;justify-content:space-between;align-items:center;padding:8px 14px;font-family:var(--f-latin);font-size:12px;color:#8FA39D;border-bottom:1px solid #22302C}
.code-h button{background:#1C2926;border:1px solid #2A3A36;color:#C9D6D2;border-radius:6px;padding:2px 10px;font-size:12px}
.code pre{margin:0;padding:14px 16px;overflow-x:auto;font-family:var(--f-mono);font-size:13px;line-height:1.7}
.tok-k{color:#7FD4C1} .tok-c{color:#7C8F89;font-style:italic} .tok-n{color:#F0C46B} .tok-s{color:#E6A3C2} .tok-f{color:#A9C7FF}
.cmt-fa{direction:rtl;font-family:var(--f-body);color:#9FB7B0;font-style:normal}
.quiz{display:flex;align-items:center;gap:12px;background:var(--saffron-soft);border-radius:10px;padding:12px 16px;font-weight:600;font-size:14px;color:var(--ink)}
.quiz .ltr{font-weight:400;color:var(--ink-2);font-size:12.5px}
.quiz a{margin-inline-start:auto;font-size:13px}
.challenge{background:var(--plum-soft);border-radius:10px;padding:14px 16px}
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:40px;padding-top:22px;border-top:1px solid var(--line)}
.lesson-nav a{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:10px;padding:10px 16px;background:var(--surface);color:var(--ink);min-width:0}
.lesson-nav a small{color:var(--ink-3)}
.lesson-nav a:hover{text-decoration:none;border-color:var(--accent)}
ul.fa-list{margin:0;padding-inline-start:22px}

/* assistant panel */
.assist{border-inline-start:1px solid var(--line);background:var(--surface);position:sticky;top:64px;height:calc(100vh - 64px);display:flex;flex-direction:column}
.assist .tabs{margin:0;padding:0 12px}
.assist-body{padding:16px;overflow:auto;flex:1;display:flex;flex-direction:column;gap:14px}
.ctx{font-size:12.5px;background:var(--sunk);border-radius:8px;padding:10px 12px;color:var(--ink-2);line-height:1.7}
.ctx b{color:var(--ink);display:block;font-size:11.5px;margin-bottom:2px}
.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.actions button{background:var(--paper);border:1px solid var(--line);border-radius:9px;padding:10px;text-align:start;font-size:13px;font-weight:600;display:flex;flex-direction:column;gap:2px}
.actions button small{font-weight:400;color:var(--ink-3);font-size:11.5px}
.actions button.on{border-color:var(--accent);background:var(--accent-soft)}
.answer{border:1px solid var(--line);border-radius:10px;padding:14px;font-size:13.5px;line-height:1.95;white-space:pre-line}
.answer .who{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--ink-3);margin-bottom:6px}
.answer .dot{width:18px;height:18px;border-radius:5px;background:var(--accent)}
.composer{display:flex;gap:8px;border-top:1px solid var(--line);padding:12px}
.composer input{flex:1;min-width:0;border:1px solid var(--line);border-radius:9px;padding:8px 12px;font:inherit;font-size:13px;background:var(--paper);color:var(--ink)}
.note-area{width:100%;min-height:120px;border:1px solid var(--line);border-radius:9px;padding:10px;font:inherit;font-size:13.5px;background:var(--paper);color:var(--ink);resize:vertical}
.saved-note{border:1px solid var(--line);border-radius:9px;padding:10px 12px;font-size:13px;background:var(--paper)}
.saved-note small{color:var(--ink-3);display:block}
.ex{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--sunk);font-size:13.5px;background:none;border-inline:0;border-top:0;width:100%;text-align:start}
.ex .ltr{font-size:11.5px;color:var(--ink-3);display:block}

/* DASHBOARD */
.dash{display:grid;grid-template-columns:1.4fr 1fr;gap:20px;padding-block:24px 64px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.panel h3{font-size:16px;margin-bottom:14px}
.prog-row{display:grid;grid-template-columns:44px 1fr 60px;gap:14px;align-items:center;padding:10px 0;border-top:1px solid var(--sunk)}
.prog-row:first-of-type{border-top:0}
.prog-row .bar{height:8px}
.prog-row .bar i{background:var(--c)}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:6px}
.week div{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:11.5px;color:var(--ink-3)}
.week i{width:100%;border-radius:6px;background:var(--accent);display:block}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}
.kpis div{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.kpis b{font-family:var(--f-display);font-weight:400;font-size:28px;display:block;line-height:1.3}

/* search overlay */
.overlay{position:fixed;inset:0;background:rgba(8,20,17,.45);z-index:50;display:grid;place-items:start center;padding-top:12vh}
.palette{width:min(620px,92vw);background:var(--surface);border-radius:14px;border:1px solid var(--line);overflow:hidden;box-shadow:0 30px 60px -20px rgba(0,0,0,.4)}
.palette input{width:100%;border:0;border-bottom:1px solid var(--line);padding:16px 18px;font:inherit;font-size:16px;background:none;color:var(--ink);outline:none}
.palette .r{display:flex;gap:10px;align-items:center;padding:10px 18px;color:var(--ink);font-size:14px;border-top:1px solid var(--sunk)}
.palette .r:hover{background:var(--sunk);text-decoration:none}
.palette .r small{color:var(--ink-3);margin-inline-start:auto}

.toast{position:fixed;bottom:calc(24px + env(safe-area-inset-bottom,0px));left:50%;transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:10px 18px;border-radius:10px;font-size:13.5px;z-index:60}

/* responsive */
@media (max-width:1100px){
  .reader{grid-template-columns:minmax(0,1fr) 320px}.toc{display:none}
  .hero{grid-template-columns:1fr}.course-head{grid-template-columns:1fr}
}
@media (max-width:820px){
  .nav,.search{display:none}
  .reader{grid-template-columns:1fr}.assist{position:static;height:auto;border-inline-start:0;border-top:1px solid var(--line)}
  .article{padding:12px max(16px,env(safe-area-inset-right,0px)) 40px max(16px,env(safe-area-inset-left,0px))}
  .modebar{top:64px}
  .mode-both .blk.pair{grid-template-columns:1fr}
  .mode-both .blk.pair .en{border-inline-start:0;padding-inline-start:0;border-top:1px dashed var(--line);padding-top:8px}
  .hero h1{font-size:36px}
  .stats{grid-template-columns:repeat(2,1fr)}.stats>div:nth-child(3){border-inline-start:0;padding-inline-start:0}
  .how{grid-template-columns:1fr 1fr}.how>div:nth-child(3){border-inline-start:0}.how>div:nth-child(n+3){border-top:1px solid var(--line)}
  .grid{grid-template-columns:1fr}
  .quiz .ltr{display:none}
  .dash{grid-template-columns:1fr}
  .lesson{grid-template-columns:24px 36px 1fr auto}.lesson .res{display:none}
  .bili-row{grid-template-columns:1fr}.bili-row .ltr{border-inline-start:0;border-top:1px dashed var(--line)}
  .ask{inset-inline-end:4px;top:-30px}
  .continue{grid-template-columns:auto 1fr}.continue .btn{grid-column:1/-1;justify-content:center}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* ===== v2: home + lesson (try-it, section quiz) ===== */
:root{--sun:#E9A93A;--hero:#0B2A25;--hero-2:#123B34;--hero-ink:#EAF4F0;--hero-mute:#9FC0B7;--good:#1F9D63;--good-soft:#E1F4EA;--bad:#D2513C;--bad-soft:#FBE7E2}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--hero:#08201C;--hero-2:#0F302A;--good-soft:#173A2A;--bad-soft:#3E1F19}}
:root[data-theme="dark"]{--hero:#08201C;--hero-2:#0F302A;--good-soft:#173A2A;--bad-soft:#3E1F19}
.btn-sun{background:var(--sun);color:#2A1C02;border:0}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.top-chip{display:inline-flex;align-items:center;gap:4px;font-weight:700;font-size:13px;padding:5px 10px;border-radius:99px;background:var(--saffron-soft);color:var(--saffron)}
.top-chip.xp{background:var(--accent-soft);color:var(--accent)}

.h2-hero{background:radial-gradient(900px 420px at 20% 10%,rgba(233,169,58,.16),transparent 60%),radial-gradient(700px 500px at 90% 90%,rgba(79,194,166,.18),transparent 60%),linear-gradient(160deg,var(--hero),var(--hero-2));color:var(--hero-ink);position:relative;overflow:hidden}
.h2-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(to bottom,#000,transparent 85%)}
.h2-hero-in{position:relative;display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center;padding-block:64px 72px}
.h2-pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);padding:4px 12px;border-radius:99px;color:var(--hero-mute)}
.h2-pill i{width:7px;height:7px;border-radius:50%;background:#4FD1A5;box-shadow:0 0 0 4px rgba(79,209,165,.2)}
.h2-copy h1{font-size:58px;margin:18px 0 16px;color:#fff}
.h2-copy h1 .hl{color:var(--sun);white-space:nowrap;background:linear-gradient(transparent 72%,rgba(233,169,58,.22) 72%)}
.h2-copy>p{font-size:17px;color:var(--hero-mute);max-width:36em;margin:0 0 26px}
.h2-search{display:flex;align-items:center;gap:10px;background:#fff;border-radius:14px;padding:6px 6px 6px 6px;padding-inline-start:16px;color:#5B6B66;box-shadow:0 20px 50px -20px rgba(0,0,0,.5);max-width:620px}
.h2-search input{flex:1;border:0;outline:0;font:inherit;font-size:15px;min-width:0;background:none;color:#14211E;height:44px}
.h2-sugg{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px;font-size:13px;color:var(--hero-mute)}
.h2-sugg a{color:var(--hero-ink);border:1px solid rgba(255,255,255,.16);border-radius:99px;padding:2px 12px}
.h2-sugg a:hover{background:rgba(255,255,255,.08);text-decoration:none}
.h2-trust{display:flex;flex-wrap:wrap;gap:22px;align-items:center;margin-top:34px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1)}
.h2-trust span{font-size:12px;color:var(--hero-mute)}
.h2-trust b{font-size:17px;color:rgba(255,255,255,.72);font-weight:500;letter-spacing:.01em}
.h2-stage{position:relative;padding:28px 10px 40px}
.h2-ide{background:#0A1513;border:1px solid rgba(255,255,255,.1);border-radius:16px;overflow:hidden;box-shadow:0 40px 80px -30px rgba(0,0,0,.7);transform:rotate(-1.2deg)}
.h2-ide-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.08);font-size:12px;color:#8FA39D}
.dots{display:flex;gap:6px}.dots i{width:10px;height:10px;border-radius:50%;background:#2B3A36}
.h2-run{background:var(--sun);color:#2A1C02;font-weight:700;padding:3px 12px;border-radius:7px}
.h2-ide pre{margin:0;padding:18px;font-family:var(--f-mono);font-size:14px;line-height:1.8;color:#DDE7E3;overflow-x:auto}
.h2-out{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.08);padding:12px 18px;font-family:var(--f-mono);font-size:13px;color:#DDE7E3;background:#071010}
.h2-out .ok{font-family:var(--f-body);color:#4FD1A5;font-weight:600}
.h2-float{position:absolute;background:var(--surface);color:var(--ink);border-radius:14px;padding:12px 16px;box-shadow:0 24px 50px -20px rgba(0,0,0,.55);font-size:13px;border:1px solid var(--line)}
.h2-quiz{inset-inline-start:-18px;bottom:-6px;width:230px}
.h2-quiz b{font-size:15px}
.h2-qbar{display:flex;gap:4px;margin:8px 0 6px}.h2-qbar i{flex:1;height:7px;border-radius:9px;background:var(--sunk)}.h2-qbar .g{background:var(--good)}.h2-qbar .r{background:var(--bad)}
.h2-streak{inset-inline-end:-6px;top:0;display:flex;gap:10px;align-items:center}

.h2-today{display:grid;grid-template-columns:1.6fr 1fr;gap:16px;margin-top:-36px;position:relative;z-index:2;margin-bottom:64px}
.h2-cont,.h2-goal{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px 20px;box-shadow:0 18px 40px -28px rgba(10,40,34,.45)}
.h2-cont{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center;color:inherit}
.h2-cont:hover{text-decoration:none;border-color:var(--accent)}
.h2-cont h3{font-size:18px;margin:2px 0 8px}
.h2-cont-thumb{width:64px;height:64px;border-radius:14px;background:linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 55%,#000));display:grid;place-items:center;color:#fff;font-weight:700;font-size:20px}
.h2-steps{display:flex;gap:5px;margin-bottom:6px;max-width:320px}.h2-steps i{flex:1;height:6px;border-radius:9px;background:var(--sunk)}.h2-steps .d{background:var(--accent)}.h2-steps .a{background:linear-gradient(90deg,var(--sunk) 40%,var(--accent) 40%)}
.h2-goal{display:flex;gap:16px;align-items:center}
.h2-week{display:flex;gap:5px;margin-top:8px}.h2-week span{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:11.5px;background:var(--sunk);color:var(--ink-3)}
.h2-week .on{background:var(--saffron-soft);color:var(--saffron);font-weight:700}.h2-week .today{border:2px solid var(--sun);color:var(--ink);font-weight:700}

.h2-sec{margin-bottom:64px}
.h2-paths{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.h2-path{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;color:var(--ink);display:flex;flex-direction:column;gap:8px;position:relative;overflow:hidden}
.h2-path::before{content:"";position:absolute;inset-block-start:0;inset-inline:0;height:5px;background:var(--c)}
.h2-path:hover{text-decoration:none;border-color:var(--c)}
.h2-path h3{font-size:19px}
.h2-path p{margin:0;font-size:13.5px;color:var(--ink-2);line-height:1.8}
.h2-track{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:0}
.h2-track li{display:flex;align-items:center;gap:10px;font-size:13.5px;padding:6px 0;position:relative;color:var(--ink-2)}
.h2-track li span{width:16px;height:16px;border-radius:50%;border:2px solid var(--line);background:var(--surface);flex:none;position:relative;z-index:1}
.h2-track li:not(:last-child)::after{content:"";position:absolute;inset-inline-start:7px;top:22px;bottom:-8px;width:2px;background:var(--line)}
.h2-track li.done span{background:var(--c);border-color:var(--c)}
.h2-track li.done::after{background:var(--c)!important}
.h2-track li.now{color:var(--ink);font-weight:700}
.h2-track li.now span{border-color:var(--c);box-shadow:0 0 0 4px var(--cs)}
.h2-filter{display:flex;gap:6px;flex-wrap:wrap}
.h2-filter button{border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:5px 14px;font-size:13px;color:var(--ink-2)}
.h2-filter button.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.h2-courses{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.h2-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;color:var(--ink);display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.h2-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:0 22px 40px -26px rgba(10,40,34,.5)}
.h2-cover{height:118px;position:relative;background:radial-gradient(120px 120px at 85% 20%,rgba(255,255,255,.22),transparent 70%),repeating-linear-gradient(135deg,rgba(255,255,255,.07) 0 2px,transparent 2px 14px),linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 50%,#000));padding:14px 16px;display:flex;align-items:flex-start;gap:8px}
.h2-cover .g{position:absolute;inset-inline-start:16px;bottom:-4px;font-size:54px;font-weight:700;color:rgba(255,255,255,.9);line-height:1}
.h2-cover .org{font-size:12px;color:#fff;background:rgba(0,0,0,.22);padding:2px 10px;border-radius:99px}
.c-ink .h2-cover{background:radial-gradient(120px 120px at 85% 20%,rgba(233,169,58,.35),transparent 70%),repeating-linear-gradient(135deg,rgba(255,255,255,.06) 0 2px,transparent 2px 14px),linear-gradient(135deg,#1F3A5F,#0E1C2E)}
.h2-card-b{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px}
.h2-card-b h3{font-size:17.5px}
.h2-card-b .en{font-size:12.5px;color:var(--ink-3)}
.h2-meta{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:12.5px;color:var(--ink-2)}
.h2-loop{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:34px;margin-bottom:56px}
.h2-loop-head{max-width:560px;margin-bottom:24px}.h2-loop-head h2{font-size:30px}.h2-loop-head p{margin:6px 0 0}
.h2-loop-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.h2-loop-grid>div{background:var(--paper);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:6px}
.h2-loop-grid .n{font-family:var(--f-display);font-size:24px;color:var(--accent)}
.h2-loop-grid h4{margin:0;font-size:15px}
.h2-loop-grid p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.8;flex:1}
.mini{margin-top:8px;border-radius:10px;height:62px;padding:10px;background:var(--surface);border:1px solid var(--line);display:grid;gap:6px}
.mini-bili{grid-template-columns:1fr 1fr}.mini-bili i{background:var(--sunk);border-radius:4px}.mini-bili .s{background:var(--accent-soft)}
.mini-code{background:#0A1513;color:#DDE7E3;font-family:var(--f-mono);font-size:12px;line-height:1.6;display:block;border:0}.mini-code span{color:var(--sun)}.mini-code b{color:#4FD1A5;font-weight:400}
.mini-quiz{grid-template-columns:repeat(4,1fr);align-items:center}.mini-quiz i{height:10px;border-radius:9px;background:var(--sunk)}.mini-quiz .g{background:var(--good)}.mini-quiz .r{background:var(--bad)}
.mini-chat{align-content:center}.mini-chat i{height:12px;border-radius:9px;background:var(--sunk);width:80%}.mini-chat .me{background:var(--accent-soft);width:55%;justify-self:end}
.h2-py{display:grid;grid-template-columns:1fr 1.2fr;gap:40px;align-items:center;background:linear-gradient(135deg,#1F3A5F,#0E1C2E);color:#E8EEF6;border-radius:20px;padding:40px}
.h2-py h2{font-size:32px;color:#fff;margin:6px 0 10px}
.h2-py p{color:#B6C3D6;margin:0 0 20px}
.h2-py-list{display:flex;flex-direction:column;gap:8px}
.h2-py-list a{display:grid;grid-template-columns:1fr auto;grid-template-areas:"b f" "e f";gap:0 12px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:10px 16px;color:#fff}
.h2-py-list a:hover{background:rgba(255,255,255,.1);text-decoration:none}
.h2-py-list b{grid-area:b;font-weight:600}.h2-py-list .ltr{grid-area:e;font-size:12px;color:#9FB0C8}.h2-py-list .faint{grid-area:f;align-self:center;color:#F2C46B}

/* lesson step bar */
.lsteps{display:flex;gap:4px;flex:1;max-width:420px;margin-inline:12px}
.lsteps span{flex:1;font-size:10.5px;color:var(--ink-3);display:flex;flex-direction:column;gap:4px;text-align:center;white-space:nowrap}
.lsteps i{height:5px;border-radius:9px;background:var(--sunk)}
.lsteps .d i{background:var(--accent)}.lsteps .a i{background:linear-gradient(270deg,var(--accent) 55%,var(--sunk) 55%)}.lsteps .a{color:var(--ink);font-weight:700}

/* try-it editor */
.tryit{border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:6px 0 26px;background:var(--surface);box-shadow:0 18px 40px -30px rgba(10,40,34,.5)}
.tryit-h{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 16px;border-bottom:1px solid var(--line)}
.tryit-h b{font-size:15px}
.tryit-tag,.sq-tag{font-size:11.5px;font-weight:700;background:var(--sun);color:#2A1C02;padding:2px 10px;border-radius:99px;margin-inline-end:8px}
.tryit-body{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);min-height:330px}
.ed{display:flex;background:#0D1917;color:#DDE7E3;min-width:0;order:1}
.out{order:2}
.gut{padding:14px 8px;text-align:right;color:#4E625C;font-family:var(--f-mono);font-size:13px;line-height:1.7;user-select:none;background:#0A1412;min-width:36px}
.ed-in{position:relative;flex:1;min-width:0}
.ed-hl,.ed-ta{margin:0;position:absolute;inset:0;padding:14px;font-family:var(--f-mono);font-size:13px;line-height:1.7;white-space:pre;overflow:auto;tab-size:4;border:0;letter-spacing:0}
.ed-hl{pointer-events:none;color:#DDE7E3}
.ed-ta{background:transparent;color:transparent;caret-color:#F2C46B;resize:none;outline:none;-webkit-text-fill-color:transparent}
.ed-ta::selection{background:rgba(79,194,166,.3);-webkit-text-fill-color:transparent}
.ed-ta:focus-visible{box-shadow:inset 0 0 0 2px var(--sun)}
.out{display:flex;flex-direction:column;border-inline-start:1px solid var(--line);min-width:0;background:var(--paper)}
.out-h{display:flex;justify-content:space-between;align-items:center;padding:8px 14px;font-size:12.5px;font-weight:600;border-bottom:1px solid var(--line);color:var(--ink-2)}
.out-st{font-weight:600;font-size:11.5px;padding:1px 10px;border-radius:99px;background:var(--sunk)}
.out-st.st-ok{background:var(--good-soft);color:var(--good)}.out-st.st-err{background:var(--bad-soft);color:var(--bad)}.out-st.st-loading,.out-st.st-running{background:var(--saffron-soft);color:var(--saffron)}
.console{margin:0;padding:12px 14px;font-family:var(--f-mono);font-size:12.5px;line-height:1.75;overflow:auto;flex:1;color:var(--ink);white-space:pre-wrap}
.console .err{color:var(--bad)}
.tryit-f{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 16px;border-top:1px solid var(--line)}
.kbd2{font-size:11px;opacity:.75;border:1px solid currentColor;border-radius:5px;padding:0 5px}
.tryit-hint{font-size:12.5px;color:var(--ink-2);flex:1;min-width:200px}
.tryit-hint::before{content:"چالش: ";font-weight:700;color:var(--saffron)}

/* section quiz */
.squiz{border:2px solid var(--accent-soft);border-radius:16px;padding:20px 22px;margin:8px 0 30px;background:var(--surface)}
.sq-h{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.sq-h b{font-size:16px}
.sq-tag{background:var(--accent);color:var(--accent-ink)}
.sq-dots{display:flex;gap:5px}.sq-dots i{width:34px;height:7px;border-radius:9px;background:var(--sunk)}
.sq-dots .g{background:var(--good)}.sq-dots .r{background:var(--bad)}.sq-dots .cur{background:var(--ink-3)}
.sq-q p{font-size:17px;font-weight:600;margin:4px 0 14px;line-height:1.9}
.sq-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sq-o{display:flex;align-items:center;gap:12px;text-align:start;background:var(--paper);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14.5px;transition:border-color .12s,transform .12s}
.sq-o:hover:not([disabled]){border-color:var(--accent);transform:translateY(-1px)}
.sq-o .k{width:28px;height:28px;border-radius:8px;background:var(--surface);border:1px solid var(--line);display:grid;place-items:center;font-size:12.5px;font-weight:700;flex:none}
.sq-o .m{margin-inline-start:auto;font-weight:800}
.sq-o.sel{border-color:var(--accent);background:var(--accent-soft)}
.sq-o.ok{border-color:var(--good);background:var(--good-soft)}.sq-o.ok .k{background:var(--good);color:#fff;border-color:var(--good)}.sq-o.ok .m{color:var(--good)}
.sq-o.bad{border-color:var(--bad);background:var(--bad-soft)}.sq-o.bad .k{background:var(--bad);color:#fff;border-color:var(--bad)}.sq-o.bad .m{color:var(--bad)}
.sq-o.dim{opacity:.55}
.sq-fb{margin-top:14px;border-radius:12px;padding:12px 16px;font-size:14px;line-height:1.9}
.sq-fb.ok{background:var(--good-soft)}.sq-fb.ok b{color:var(--good)}
.sq-fb.bad{background:var(--bad-soft)}.sq-fb.bad b{color:var(--bad)}
.sq-f{display:flex;justify-content:space-between;align-items:center;margin-top:16px;gap:10px}
.sq-done{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center}
.sq-score{font-family:var(--f-display);font-size:48px;color:var(--accent);line-height:1}.sq-score small{font-size:22px;color:var(--ink-3)}
.sq-act{display:flex;gap:8px}

@media (max-width:1100px){.h2-hero-in{grid-template-columns:1fr}.h2-courses,.h2-paths{grid-template-columns:1fr 1fr}.h2-loop-grid{grid-template-columns:1fr 1fr}.lsteps{display:none}}
@media (max-width:820px){
  .top-chip{display:none}
  .h2-copy h1{font-size:38px}.h2-today{grid-template-columns:1fr;margin-top:-24px}
  .h2-courses,.h2-paths,.h2-loop-grid,.h2-py{grid-template-columns:1fr}.h2-py,.h2-loop{padding:22px}
  .h2-quiz{inset-inline-start:0}.h2-stage{padding-inline:0}
  .tryit-body{grid-template-columns:1fr}.ed{order:1;min-height:300px}.out{order:2;border-inline-start:0;border-top:1px solid var(--line)}
  .sq-opts{grid-template-columns:1fr}.sq-done{grid-template-columns:1fr}
  .h2-cont{grid-template-columns:auto 1fr}.h2-cont .btn{grid-column:1/-1;justify-content:center}
}
/* v2 polish */
.nav a,.brand small{white-space:nowrap}
.search{width:250px}
pre,code,.ed-hl,.ed-ta,.console,.gut{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0}
.h2-copy h1 .hl{background:linear-gradient(transparent 82%,rgba(233,169,58,.25) 82%)}
.tryit-body{grid-template-columns:minmax(0,1.7fr) minmax(0,1fr)}
@media (max-width:1240px){.top .wrap{gap:14px}.brand small{display:none}}
.top-chip{white-space:nowrap}.h2-paths{align-items:start}

/* ===== v3: AI look + three progress tracks ===== */
:root{--read:#0284C7;--read-soft:#E0F2FE;--exc:#B7791F;--exc-soft:#FDF0D5;--quiz:#7C3AED;--quiz-soft:#EDE7FB;
  --ga:#0E9F6E;--gb:#C98A12;--gc:#DC4B3E;--glass:rgba(255,255,255,.7);--glow:rgba(14,107,90,.25);--grad:linear-gradient(90deg,#0E8F75,#0284C7 55%,#7C3AED)}
:root[data-theme="dark"]{
  --paper:#05080D;--surface:#0B1118;--sunk:#111A24;--line:#1C2836;
  --ink:#E9F1F7;--ink-2:#A6B5C4;--ink-3:#6D7F92;
  --accent:#2EE6B8;--accent-soft:#0C2A26;--accent-ink:#03140F;
  --saffron:#F5B841;--saffron-soft:#2A2110;--plum:#A78BFA;--plum-soft:#1E1838;
  --read:#38BDF8;--read-soft:#0B2536;--exc:#F5B841;--exc-soft:#2A2110;--quiz:#A78BFA;--quiz-soft:#1E1838;
  --ga:#2EE6B8;--gb:#F5B841;--gc:#F87171;--good:#2EE6B8;--good-soft:#0C2A26;--bad:#F87171;--bad-soft:#2F1416;
  --glass:rgba(13,20,30,.62);--glow:rgba(46,230,184,.35);--grad:linear-gradient(90deg,#2EE6B8,#38BDF8 50%,#A78BFA);
  --code-bg:#070C12;color-scheme:dark}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#05080D;--surface:#0B1118;--sunk:#111A24;--line:#1C2836;--ink:#E9F1F7;--ink-2:#A6B5C4;--ink-3:#6D7F92;
  --accent:#2EE6B8;--accent-soft:#0C2A26;--accent-ink:#03140F;--read:#38BDF8;--read-soft:#0B2536;--exc:#F5B841;--exc-soft:#2A2110;--quiz:#A78BFA;--quiz-soft:#1E1838;
  --ga:#2EE6B8;--gb:#F5B841;--gc:#F87171;--glass:rgba(13,20,30,.62);--glow:rgba(46,230,184,.35);--grad:linear-gradient(90deg,#2EE6B8,#38BDF8 50%,#A78BFA)}}
body{background:var(--paper)}
.top{background:color-mix(in srgb,var(--paper) 80%,transparent)}
.brand-mark{background:linear-gradient(135deg,#0E8F75,#2EE6B8);box-shadow:0 0 20px var(--glow)}
.auth-slot{display:flex;align-items:center;gap:8px}
.avatar{background:linear-gradient(135deg,#38BDF8,#A78BFA);color:#fff;text-decoration:none!important}
.btn.sm{padding:7px 14px;font-size:13px}
.btn.wide{width:100%;justify-content:center}
.btn-glow{background:linear-gradient(135deg,#14B892,#2EE6B8);color:#03140F;border:0;box-shadow:0 8px 30px -8px var(--glow),inset 0 1px 0 rgba(255,255,255,.35)}
.btn-glow:hover{filter:brightness(1.08)}
.btn-line{background:transparent;border:1px solid var(--line);color:var(--ink)}
.btn-line:hover{border-color:var(--accent)}
.glass{background:var(--glass);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border:1px solid rgba(255,255,255,.09);border-radius:18px;box-shadow:0 30px 60px -30px rgba(0,0,0,.7)}

.ai-hero{position:relative;overflow:hidden;background:radial-gradient(800px 500px at 25% 40%,rgba(56,189,248,.10),transparent 60%),radial-gradient(700px 500px at 80% 0%,rgba(46,230,184,.12),transparent 60%),radial-gradient(600px 400px at 10% 100%,rgba(167,139,250,.12),transparent 60%),#04070B;color:#E9F1F7;border-bottom:1px solid #121C27}
.ai-hero #nn{position:absolute;inset:0;width:100%;height:100%}
.ai-hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);background-size:26px 26px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%);pointer-events:none}
.ai-hero-in{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding-block:72px 84px}
.ai-pill{display:inline-flex;gap:8px;align-items:center;font-size:13px;color:#9FB4C6;border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.04);border-radius:99px;padding:5px 14px}
.ai-pill i{width:7px;height:7px;border-radius:50%;background:#2EE6B8;box-shadow:0 0 12px #2EE6B8}
.ai-copy h1{font-size:64px;line-height:1.22;margin:20px 0 18px;color:#fff;display:flex;flex-direction:column}
.ai-copy h1 .grad{background:linear-gradient(90deg,#2EE6B8,#38BDF8 45%,#A78BFA 80%);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 24px rgba(46,230,184,.25));padding-bottom:4px}
.ai-copy>p{font-size:17px;color:#9FB4C6;max-width:34em;margin:0 0 28px}
.ai-cta{display:flex;gap:12px;flex-wrap:wrap}
.ai-cta .btn{padding:13px 24px;font-size:15px}
.ai-hero .btn-line{color:#E9F1F7;border-color:rgba(255,255,255,.18)}
.ai-trust{display:flex;flex-wrap:wrap;gap:24px;align-items:center;margin-top:40px}
.ai-trust span{font-size:12px;color:#6D7F92}.ai-trust b{color:rgba(233,241,247,.6);font-weight:500;font-size:16px}
.ai-stage{position:relative;padding:20px 0 40px}
.ai-chat{padding:18px;max-width:430px;margin-inline-start:auto;color:#E9F1F7}
.ai-chat-h{display:flex;gap:8px;align-items:center;font-size:13px;margin-bottom:12px}
.ai-chat .faint{color:#6D7F92}
.orb{width:22px;height:22px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff,#2EE6B8 35%,#0284C7 70%,#7C3AED);box-shadow:0 0 18px rgba(46,230,184,.6);animation:orb 4s ease-in-out infinite}
@keyframes orb{50%{box-shadow:0 0 28px rgba(56,189,248,.8)}}
.bubble{border-radius:14px;padding:10px 14px;font-size:14px;line-height:1.95;margin-bottom:10px}
.bubble.me{background:rgba(56,189,248,.14);border:1px solid rgba(56,189,248,.25);margin-inline-end:40px}
.bubble.ai{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);margin-inline-start:20px}
.xor{display:block;width:100%;max-width:220px;height:auto;margin:8px auto;direction:ltr}
.xor .ax{stroke:rgba(255,255,255,.2)}.xor .bd{stroke:#F5B841;stroke-width:2;stroke-dasharray:5 4;fill:none}.xor .p{fill:#2EE6B8}.xor .n{fill:none;stroke:#F87171;stroke-width:2.5}
.caret{display:inline-block;width:8px;height:16px;background:#2EE6B8;vertical-align:middle;margin-inline-start:4px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.ai-chips{display:flex;gap:6px;flex-wrap:wrap}.ai-chips span{font-size:12px;border:1px solid rgba(255,255,255,.12);border-radius:99px;padding:3px 10px;color:#A6B5C4}
.ai-run{position:absolute;inset-inline-start:-10px;bottom:6px;padding:12px 16px;font-family:var(--f-mono);font-size:13px;color:#DDE7E3;line-height:1.7}
.ai-run .k{color:#F5B841}.ai-run .o{color:#fff}.ai-run .ok{font-family:var(--f-body);color:#2EE6B8;font-weight:600;margin-inline-start:8px}
.ai-tr{position:absolute;inset-inline-start:30px;top:-6px;padding:10px 16px;display:flex;gap:10px;align-items:center;font-size:14px;color:#E9F1F7}
.ai-tr .ltr{color:#9FB4C6}.ai-tr .arr{color:#2EE6B8}

/* report-card strip */
.rc{margin:-44px 0 64px;position:relative;z-index:2}
.rc-h{display:flex;justify-content:space-between;align-items:end;margin-bottom:16px;gap:12px}
.rc-h h2{font-size:26px}
.rc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rc-card{--tc:var(--read);--ts:var(--read-soft);background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--tc);border-radius:16px;padding:18px 20px;color:var(--ink);display:flex;flex-direction:column;gap:8px;box-shadow:0 20px 40px -30px rgba(0,0,0,.8)}
.rc-card:hover{text-decoration:none;border-color:var(--tc)}
.t-read{--tc:var(--read);--ts:var(--read-soft)}.t-ex{--tc:var(--exc);--ts:var(--exc-soft)}.t-quiz{--tc:var(--quiz);--ts:var(--quiz-soft)}
.rc-ic{width:36px;height:36px;border-radius:10px;background:var(--ts);color:var(--tc);display:grid;place-items:center}
.rc-ic svg{width:20px;height:20px}
.rc-lab{font-weight:700;font-size:15px}.rc-lab small{font-weight:500;color:var(--tc);font-size:11.5px;margin-inline-start:6px;background:var(--ts);padding:1px 8px;border-radius:99px}
.rc-num{font-family:var(--f-display);font-size:34px;line-height:1.2}.rc-num small{font-family:var(--f-body);font-size:13px;color:var(--ink-3)}
.rc-card .bar i,.tri-sum .bar i,.dcol .bar i{background:var(--tc)}
.rc-card p{margin:0;font-size:12.5px;color:var(--ink-2);line-height:1.8}
.qmini{display:flex;gap:5px;align-items:flex-end;height:40px}.qmini i{flex:1;border-radius:4px 4px 0 0}
.g-a{background:var(--ga)}.g-b{background:var(--gb)}.g-c{background:var(--gc)}

/* cards with neural cover */
.ai-card .h2-cover{background:radial-gradient(160px 120px at 80% 20%,color-mix(in srgb,var(--c) 45%,transparent),transparent 70%),linear-gradient(135deg,color-mix(in srgb,var(--c) 30%,#05080D),#05080D)}
.c-ink.ai-card .h2-cover{background:radial-gradient(160px 120px at 80% 20%,rgba(56,189,248,.4),transparent 70%),linear-gradient(135deg,#0B2236,#05080D)}
.c-ink{--c:#38BDF8;--cs:var(--read-soft)}
.net{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.net line{stroke:color-mix(in srgb,var(--c) 70%,#fff);stroke-width:.6;opacity:.45}
.net circle{fill:color-mix(in srgb,var(--c) 60%,#fff)}
.ai-card .h2-cover .g{text-shadow:0 0 30px color-mix(in srgb,var(--c) 70%,transparent)}
.ai-card{transition:transform .15s,box-shadow .15s,border-color .15s}
.ai-card:hover{border-color:color-mix(in srgb,var(--c) 60%,var(--line));box-shadow:0 20px 50px -24px color-mix(in srgb,var(--c) 50%,transparent)}
.tri{display:flex;gap:6px;flex-wrap:wrap;margin-top:4px}
.tri span{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;color:var(--tc);background:var(--ts);padding:2px 9px;border-radius:99px}
.tri svg{width:13px;height:13px}
.h2-loop,.h2-path,.h2-card{background:var(--surface)}
.h2-loop-grid>div{background:var(--sunk)}
.h2-py{background:radial-gradient(500px 300px at 90% 10%,rgba(245,184,65,.15),transparent 60%),linear-gradient(135deg,#0B2236,#05080D);border:1px solid var(--line)}

/* course page */
.course-band{background:radial-gradient(700px 300px at 85% 0%,color-mix(in srgb,var(--c) 18%,transparent),transparent 70%),var(--paper);border-bottom:1px solid var(--line)}
.course-head{padding-bottom:36px}
.tri-sum{display:flex;flex-direction:column;gap:12px}
.tri-sum>div{border:1px solid var(--line);border-inline-start:3px solid var(--tc);border-radius:12px;padding:10px 14px;background:var(--surface)}
.ts-h{display:flex;align-items:center;gap:8px;color:var(--tc)}.ts-h b{color:var(--ink);font-size:14px}.ts-h small{margin-inline-start:auto;font-size:11px;color:var(--ink-3)}
.ts-n{font-family:var(--f-display);font-size:26px;line-height:1.3}.ts-n small{font-family:var(--f-body);font-size:12.5px;color:var(--ink-3)}
.ts-trans{border-top:1px dashed var(--line);padding-top:12px;display:flex;flex-direction:column;gap:6px}
.bar.thin{height:4px}
.login-nudge{display:flex;flex-direction:column;gap:10px;color:var(--read)}
.login-nudge b{color:var(--ink)}
.key{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;font-size:12.5px;margin-bottom:14px}
.key>span:not(.faint){display:inline-flex;gap:6px;align-items:center;color:var(--tc);font-weight:600}
.part-h{flex-wrap:wrap}
.pmini{display:flex;gap:6px;margin-inline-start:auto}
.pmini>span{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;color:var(--tc);background:var(--ts);padding:2px 9px;border-radius:99px}
.pmini svg{width:13px;height:13px}
.pmini+.count{margin-inline-start:12px}
.lesson.v3{grid-template-columns:96px minmax(0,1fr) auto 120px;padding:8px 18px;gap:14px}
.lrow-link{display:grid;grid-template-columns:40px minmax(0,1fr);gap:10px;align-items:center;color:var(--ink);min-width:0}
.lrow-link:hover{text-decoration:none}.lrow-link:hover .lt div{color:var(--accent)}
.readbtn{display:inline-flex;align-items:center;gap:6px;justify-content:center;border:1.5px dashed var(--line);background:transparent;border-radius:9px;padding:5px 10px;font-size:12.5px;color:var(--ink-3)}
.readbtn:hover{border-color:var(--read);color:var(--read)}
.readbtn.on{border:1.5px solid var(--read);background:var(--read-soft);color:var(--read);font-weight:700}
.exchip{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:600;padding:3px 10px;border-radius:8px;border:1px solid var(--line);color:var(--ink-3);white-space:nowrap}
.exchip svg{width:13px;height:13px}
.exchip.part{color:var(--exc);border-color:color-mix(in srgb,var(--exc) 50%,transparent)}
.exchip.full{color:#1A1203;background:var(--exc);border-color:var(--exc)}
.exchip.na{border:0;font-weight:400;opacity:.6}
.trs{font-size:11.5px;color:var(--ink-3);display:inline-flex;gap:6px;align-items:center;white-space:nowrap}
.qrow{display:grid;grid-template-columns:36px minmax(0,1fr) auto auto auto;gap:14px;align-items:center;padding:12px 18px;background:color-mix(in srgb,var(--quiz-soft) 60%,transparent);border-top:1px solid var(--line)}
.qrow-ic{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--quiz-soft);color:var(--quiz)}
.qrow .lt div{font-weight:700;color:var(--quiz)}
.qmeta{font-size:12px}
.score{font-weight:800;font-size:13px;padding:3px 12px;border-radius:99px;color:#04120E}
.score.none{background:transparent;color:var(--ink-3);font-weight:500;border:1px dashed var(--line)}
.lessons .lesson{border-top:1px solid var(--sunk)}

/* auth modal */
.auth-ov{place-items:center;padding-top:0;background:rgba(2,5,9,.7);backdrop-filter:blur(4px)}
.auth{width:min(420px,92vw);padding:24px;display:flex;flex-direction:column;gap:14px;color:var(--ink);background:color-mix(in srgb,var(--surface) 92%,transparent)}
.auth-h{display:flex;gap:12px;align-items:center}.auth-h b{font-size:17px}
.auth label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--ink-2)}
.auth input{background:var(--sunk);border:1px solid var(--line);border-radius:10px;padding:10px 12px;font:inherit;color:var(--ink);outline:none}
.auth input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.or{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--ink-3)}.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.auth-what{display:flex;justify-content:space-between;gap:6px;flex-wrap:wrap;font-size:11.5px;border-top:1px dashed var(--line);padding-top:12px}
.auth-what span{display:inline-flex;align-items:center;gap:4px;color:var(--tc);font-weight:600}
.auth-what svg{width:13px;height:13px}

/* report card page */
.dash-h{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:14px 0 24px;flex-wrap:wrap}
.dash-h h1{font-size:40px}.dash-h p{margin:6px 0 0;max-width:44em}
.xp-box{display:grid;grid-template-columns:auto auto;align-items:baseline;gap:0 6px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 18px}
.xp-box b{font-family:var(--f-display);font-size:32px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.xp-box small{grid-column:1/-1;font-size:11.5px;color:var(--ink-3)}
.dash3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-bottom:64px;align-items:start}
.dcol{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--tc);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:10px}
.dcol-h{display:flex;align-items:center;gap:10px;color:var(--tc);padding-bottom:10px;border-bottom:1px solid var(--line)}
.dcol-h svg{width:24px;height:24px;flex:none}
.dcol-h b{color:var(--ink);display:block;font-size:15px}.dcol-h small{color:var(--ink-3);font-size:11.5px}
.dcol-h .big{margin-inline-start:auto;font-family:var(--f-display);font-size:30px;color:var(--tc)}
.drow{display:grid;grid-template-columns:1fr auto;gap:4px 10px;color:var(--ink);font-size:13.5px;padding:4px 0}
.drow:hover{text-decoration:none;color:var(--tc)}
.drow .bar{grid-column:1/-1;height:6px}
.dnote{font-size:12px;color:var(--ink-3);background:var(--sunk);border-radius:10px;padding:8px 12px;line-height:1.8}
.dex{display:grid;grid-template-columns:24px 1fr auto;gap:10px;align-items:center;padding:8px 0;border-bottom:1px solid var(--sunk);font-size:13px}
.dex b{font-weight:600;display:block}.dex small{color:var(--ink-3);font-size:11.5px}
.dex-st{width:22px;height:22px;border-radius:7px;border:1.5px solid var(--line);display:grid;place-items:center;font-size:12px;font-weight:800}
.dex.on .dex-st{background:var(--exc);border-color:var(--exc);color:#1A1203}
.qchart{display:flex;gap:10px;align-items:flex-end;height:130px;padding:8px 4px 0;border-bottom:1px solid var(--line)}
.qbar{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%;justify-content:flex-end;font-size:11px;color:var(--ink-3)}
.qbar i{width:100%;max-width:38px;border-radius:7px 7px 0 0;display:flex;justify-content:center;position:relative}
.qbar i b{position:absolute;top:-18px;font-size:11.5px;color:var(--ink)}
.qtable{width:100%;border-collapse:collapse;font-size:12.5px}
.qtable th{text-align:start;font-weight:500;color:var(--ink-3);padding:6px 4px;border-bottom:1px solid var(--line)}
.qtable td{padding:8px 4px;border-bottom:1px solid var(--sunk);vertical-align:middle}
.qtable td b{display:block;font-weight:600}.qtable td small{color:var(--ink-3)}

@media (max-width:1100px){.ai-hero-in{grid-template-columns:1fr}.dash3,.rc-grid{grid-template-columns:1fr}}
@media (max-width:820px){
  .ai-copy h1{font-size:42px}.ai-run,.ai-tr{display:none}.rc{margin-top:-28px}
  .lesson.v3{grid-template-columns:auto minmax(0,1fr);}.lesson.v3 .exchip,.lesson.v3 .trs{grid-column:2;justify-self:start}
  .qrow{grid-template-columns:32px 1fr}.qrow>*:nth-child(n+3){grid-column:2;justify-self:start}
  .pmini{width:100%;margin-inline-start:50px}
  .auth-slot .btn-line{display:none}
}
.ai-tr{top:-34px}.ai-run{bottom:-34px}
.rc{margin:56px 0 64px}
.qtable td.num{white-space:nowrap}
.xp-box{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 8px;max-width:320px}.xp-box small{flex-basis:100%}

/* ===== v4: showcase home, use-case art, challenges, tutor, certificate, quests ===== */
.contbar{background:linear-gradient(90deg,rgba(46,230,184,.10),rgba(56,189,248,.06));border-bottom:1px solid var(--line)}
.contbar .wrap{display:flex;align-items:center;gap:12px;padding-block:8px;font-size:13.5px;flex-wrap:wrap}
.cb-av{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,#38BDF8,#A78BFA);color:#fff;display:grid;place-items:center;font-weight:700;font-size:12px}
.contbar .btn{margin-inline-start:auto}.cb-link{font-size:13px}
.sc-hero .ai-hero-in{padding-block:56px 64px}
.sc-search{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:0 14px;height:52px;max-width:520px;color:#9FB4C6;cursor:pointer}
.sc-search:hover{border-color:rgba(46,230,184,.5)}
.sc-search input{flex:1;background:none;border:0;outline:0;color:#E9F1F7;font:inherit;font-size:15px;cursor:pointer;min-width:0}
.sc-search .kbd{border-color:rgba(255,255,255,.2);color:#9FB4C6}
.sc-stage{position:relative;aspect-ratio:16/11;max-width:100%}
.sc-slide{position:absolute;inset:0;opacity:0;transition:opacity .8s ease,transform .8s ease;transform:scale(.98);pointer-events:none;color:inherit}
.sc-slide.on{opacity:1;transform:none;pointer-events:auto}
.sc-slide:hover{text-decoration:none}
.sc-art{position:absolute;inset:0;border-radius:20px;overflow:hidden;border:1px solid rgba(255,255,255,.1);box-shadow:0 40px 80px -30px rgba(0,0,0,.8),0 0 60px -20px rgba(46,230,184,.35)}
.sc-art svg,.use-art svg{display:block;width:100%;height:100%}
.sc-cap{position:absolute;inset-inline-end:16px;bottom:16px;padding:12px 16px;display:flex;flex-direction:column;gap:2px;color:#E9F1F7;max-width:80%}
.sc-cap b{font-size:16px}.sc-cap small{color:#9FB4C6}
.sc-ind{font-size:11.5px;color:#2EE6B8;font-weight:600}
.sc-dots{position:absolute;bottom:-26px;inset-inline:0;display:flex;justify-content:center;gap:6px}
.sc-dots button{width:22px;height:5px;border-radius:9px;border:0;background:rgba(255,255,255,.18);padding:0}
.sc-dots button.on{background:#2EE6B8;width:34px}
.sc-filter{display:flex;gap:8px;flex-wrap:wrap;padding-block:28px 8px;position:sticky;top:calc(64px + env(safe-area-inset-top,0px));z-index:6;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px)}
.sc-filter button{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:99px;padding:7px 16px;font-size:13.5px}
.sc-filter button span{font-size:11px;color:var(--ink-3)}
.sc-filter button.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}.sc-filter button.on span{color:var(--paper);opacity:.7}
.sc-list{display:flex;flex-direction:column;gap:28px;padding-block:20px 72px}
.sc-course{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr);gap:32px;padding:28px;border:1px solid var(--line);border-radius:22px;background:radial-gradient(600px 260px at 100% 0%,color-mix(in srgb,var(--c) 10%,transparent),transparent 70%),var(--surface);scroll-margin-top:140px}
.sc-org{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-3)}
.sc-org .glyph{width:38px;height:38px;font-size:12px}
.sc-info{display:flex;flex-direction:column;gap:12px;min-width:0}
.sc-info h2{font-size:30px}
.sc-info .en{font-family:var(--f-latin);color:var(--ink-3);font-size:14px;margin-top:-8px}
.sc-info p{margin:0;color:var(--ink-2);font-size:14px;line-height:1.95}
.sc-facts{display:flex;flex-wrap:wrap;gap:6px}
.sc-facts span{font-size:12px;border:1px solid var(--line);border-radius:8px;padding:3px 10px;color:var(--ink-2)}
.sc-proj,.pj{display:flex;gap:12px;align-items:flex-start;border:1px dashed color-mix(in srgb,var(--c) 50%,var(--line));border-radius:12px;padding:10px 14px;color:var(--c)}
.sc-proj small,.pj small{display:block;color:var(--ink-3);font-size:11.5px}.sc-proj b,.pj b{color:var(--ink);font-size:14px}
.pj p{margin:4px 0 0;color:var(--ink-2);font-size:13px}
.pj{margin-top:18px;max-width:560px}
.sc-trans{display:flex;flex-direction:column;gap:4px}
.sc-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}
.sc-uses-h,.cuses-h{display:flex;gap:8px;align-items:center;font-size:13px;font-weight:700;color:var(--c);margin-bottom:12px}
.sc-uses-grid,.cuses{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.use{margin:0;border-radius:16px;overflow:hidden;border:1px solid var(--line);background:#070C12;transition:transform .2s,box-shadow .2s}
.use:hover{transform:translateY(-3px);box-shadow:0 20px 40px -24px color-mix(in srgb,var(--c) 60%,transparent)}
.use-art{aspect-ratio:16/10;max-width:100%}
.use figcaption{padding:10px 12px 12px;display:flex;flex-direction:column;gap:2px;background:var(--surface);border-top:1px solid var(--line)}
.use figcaption b{font-size:13.5px;line-height:1.6}.use figcaption span{font-size:12px;color:var(--c)}.use figcaption small{font-size:11.5px;color:var(--ink-3)}
.cuses-h{margin-top:22px}
.cuses{max-width:720px}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:32px;margin-bottom:56px}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}
.feat-grid>div{--tc:var(--accent);background:var(--sunk);border-radius:14px;padding:18px;color:var(--tc);border-top:2px solid var(--tc)}
.feat-grid .t-ai{--tc:var(--accent)}
.feat-grid h4{margin:10px 0 6px;color:var(--ink);font-size:15px}.feat-grid p{margin:0;color:var(--ink-2);font-size:13px;line-height:1.85}
.feat-grid svg{width:24px;height:24px}

/* course page additions */
.cert{border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:12px;background:var(--surface)}
.cert-h{display:flex;align-items:center;gap:8px;color:var(--saffron)}.cert-h b{color:var(--ink);font-size:14px}.cert-h span{margin-inline-start:auto;font-weight:700}
.cert-card{display:flex;gap:12px;align-items:center;border-radius:12px;padding:14px;background:linear-gradient(135deg,rgba(245,184,65,.14),rgba(167,139,250,.10));border:1px solid rgba(245,184,65,.35);filter:grayscale(.75);opacity:.7}
.cert.ok .cert-card{filter:none;opacity:1}
.cert-card small{display:block;font-size:11px;color:var(--ink-2)}.cert-card b{font-family:var(--f-display);font-size:20px;font-weight:400}
.cert-seal{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--saffron);color:#1A1203;flex:none}
.cert-req{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;font-size:12.5px}
.cert-req li{display:flex;gap:8px;align-items:center;color:var(--ink-3)}.cert-req li span{flex:1;color:var(--ink-2)}
.cert-req li.on{color:var(--ga)}.cert-req li.info{opacity:.75}
.cert-req svg{width:14px;height:14px}

/* lesson: challenge, glossary, tutor, read */
.tryit-tag.ch{background:var(--exc);color:#1A1203}
.tryit.is-ch{border-color:color-mix(in srgb,var(--exc) 45%,var(--line))}
.ch-task{padding:12px 16px;font-size:14px;line-height:1.95;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--exc-soft) 50%,transparent)}
.ch-task code,.ch-hints code{font-family:var(--f-mono);font-size:12.5px;background:var(--sunk);padding:1px 6px;border-radius:5px}
.ch-state{display:inline-flex;gap:6px;align-items:center;font-size:12px;font-weight:600;color:var(--exc);border:1px solid color-mix(in srgb,var(--exc) 50%,transparent);border-radius:99px;padding:3px 10px}
.ch-state.on{background:var(--exc);color:#1A1203}
.ch-state svg{width:13px;height:13px}
.ch-hints{display:flex;flex-direction:column;gap:6px;padding:10px 16px;border-top:1px solid var(--line);font-size:13.5px;background:color-mix(in srgb,var(--quiz-soft) 50%,transparent)}
.ch-hints b{color:var(--quiz);margin-inline-end:6px}
.console .pass{color:var(--ga);font-weight:700}
.out-st.st-pass{background:var(--good-soft);color:var(--ga)}.out-st.st-fail{background:var(--bad-soft);color:var(--gc)}
.term{border-bottom:1.5px dotted var(--accent);font-weight:700;position:relative;cursor:help}
.term .tip{position:absolute;bottom:calc(100% + 8px);inset-inline-start:50%;transform:translateX(50%);width:240px;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:12.5px;font-weight:400;line-height:1.8;color:var(--ink-2);box-shadow:0 20px 40px -20px rgba(0,0,0,.7);opacity:0;visibility:hidden;transition:opacity .15s;z-index:20}
.term .tip b{display:block;color:var(--accent);font-size:12px}
.term:hover .tip,.term:focus .tip{opacity:1;visibility:visible}
.answer .who{flex-wrap:wrap}
.live{margin-inline-start:auto;font-size:10.5px;font-weight:700;color:var(--ga);border:1px solid currentColor;border-radius:99px;padding:0 8px}
.live.off{color:var(--ink-3)}
.orb.sm{width:16px;height:16px}
.answer.thinking #tutorOut{animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{50%{opacity:.4}}
.read-end{display:flex;flex-direction:column;gap:6px;align-items:flex-start;margin-top:28px}
.readbtn.big{padding:10px 18px;font-size:14px}
.sq-hint{display:flex;gap:10px;align-items:flex-start;margin-top:12px;padding:10px 14px;border-radius:12px;background:var(--quiz-soft);color:var(--quiz);font-size:13.5px;line-height:1.9}
.sq-hint b{margin-inline-end:6px}.sq-hint div{color:var(--ink)}
.sq-score.g-t-a{color:var(--ga)}.sq-score.g-t-b{color:var(--gb)}.sq-score.g-t-c{color:var(--gc)}
.rv-ov{place-items:center;padding:16px;background:rgba(2,5,9,.72);backdrop-filter:blur(4px)}
.rv-box{width:min(760px,100%);max-height:90vh;overflow:auto;border-radius:18px}
.rv-box .squiz{margin:0;background:var(--surface)}

/* auth demo + report card extras */
.demo-note{font-size:12.5px;line-height:1.85;color:var(--ink-2);background:var(--sunk);border-radius:10px;padding:10px 12px;border-inline-start:3px solid var(--saffron)}
.auth .chk{flex-direction:row;align-items:center;gap:8px}
.auth .chk input{width:16px;height:16px;padding:0}
.demo-chip{font-size:11px;font-weight:700;color:var(--saffron);border:1px dashed var(--saffron);border-radius:99px;padding:2px 10px;white-space:nowrap}
.avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}
.quests{display:flex;flex-wrap:wrap;gap:10px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin-bottom:20px}
.q-h{display:flex;gap:8px;align-items:center;color:var(--saffron);margin-inline-end:6px}.q-h b{color:var(--ink)}
.quest{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--line);border-radius:12px;padding:7px 12px;font-size:13px;color:var(--tc)}
.quest span{color:var(--ink-2)}.quest b{color:var(--ga)}
.quest.on{background:var(--ts);border-color:var(--tc)}.quest.on span{color:var(--ink)}
.quest svg{width:15px;height:15px}
.quests .btn{margin-inline-start:auto}
a.dex{color:inherit}a.dex:hover{text-decoration:none;background:var(--sunk)}
.empty-state{text-align:center;padding-block:80px;display:flex;flex-direction:column;align-items:center;gap:14px}
.es-icons{display:flex;gap:10px}.es-icons span{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:var(--ts);color:var(--tc)}
.es-icons svg{width:24px;height:24px}

@media (max-width:1100px){.sc-course{grid-template-columns:1fr}.feat-grid{grid-template-columns:1fr 1fr}}
@media (max-width:820px){
  .sc-uses-grid,.cuses{grid-template-columns:1fr 1fr}.sc-uses-grid .use:nth-child(3){display:none}
  .sc-course{padding:18px}.feat-grid{grid-template-columns:1fr}.feat{padding:20px}
  .sc-stage{margin-top:10px}.sc-cap{max-width:92%}
  .quests .btn{width:100%;justify-content:center}
  .term .tip{width:200px}
}
.console [dir="rtl"]{display:block;text-align:right;font-family:var(--f-body)}
.term .tip{display:none}.term:hover .tip,.term:focus .tip{display:block}

/* ===== v5: carousel, strips, paywall, pricing, goals, requests, report card ===== */
:root{--gok:#0E9F6E}
:root[data-theme="dark"]{--gok:#86EFAC}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--gok:#86EFAC}}
.g-b{background:var(--gok)}.g-m{background:var(--gb)}
.g-t-a{color:var(--ga)}.g-t-b{color:var(--gok)}.g-t-m{color:var(--gb)}.g-t-c{color:var(--gc)}
.nav{gap:2px}.nav a{padding:8px 10px}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.car{position:relative;outline:none;user-select:none;-webkit-user-select:none}
.car:focus-visible .car-view{box-shadow:0 0 0 2px var(--accent)}
.car-view{overflow:hidden;border-radius:20px;touch-action:pan-y;cursor:grab;aspect-ratio:16/11;max-width:100%;border:1px solid rgba(255,255,255,.1);box-shadow:0 40px 80px -30px rgba(0,0,0,.8),0 0 60px -20px rgba(46,230,184,.35)}
.car.dragging .car-view{cursor:grabbing}
.car-track{display:flex;height:100%;transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.car-slide{flex:0 0 100%;position:relative;height:100%;color:inherit;-webkit-user-drag:none}
.car-slide:hover{text-decoration:none}
.car-slide .sc-art{border:0;border-radius:0;box-shadow:none}
.car-btn{position:absolute;top:calc(50% - 20px);width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.18);background:rgba(5,8,13,.55);backdrop-filter:blur(6px);color:#E9F1F7;font-size:24px;line-height:1;display:grid;place-items:center;transform:translateY(-50%)}
.car-btn:hover{border-color:#2EE6B8;color:#2EE6B8}
.car-btn.prev{inset-inline-start:10px}.car-btn.next{inset-inline-end:10px}
.car .sc-dots{bottom:-24px}
.car-hint{position:absolute;top:12px;inset-inline-start:12px;font-size:11px;color:#C9D6D2;background:rgba(5,8,13,.55);border-radius:99px;padding:2px 10px;pointer-events:none}
.strip{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:8px;cursor:grab;scrollbar-width:thin}
.strip.dragging{cursor:grabbing;scroll-snap-type:none}
.strip .use{flex:0 0 calc((100% - 28px) / 2.4);scroll-snap-align:start;min-width:200px;user-select:none}
.strip .use svg{pointer-events:none}
.sc-uses{min-width:0}
.req-band{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;border:1px dashed var(--line);border-radius:20px;padding:24px 28px;margin-bottom:56px}
.req-band h2{font-size:24px}
/* paywall */
.lesson.v3.locked .lt div{color:var(--ink-2)}
.acc{display:inline-flex;align-items:center;justify-content:center;gap:4px;font-size:12px;font-weight:600;color:var(--ink-3);border:1px solid var(--line);border-radius:9px;padding:5px 8px}
.acc.free{color:var(--ga);border-color:color-mix(in srgb,var(--ga) 50%,transparent)}
.lock-wrap{max-width:860px;padding-bottom:80px}
.lock-wrap h1{font-size:34px;margin-top:14px}
.teaser{font-size:16.5px;line-height:2.05;margin:22px 0 0;max-height:150px;overflow:hidden;-webkit-mask-image:linear-gradient(#000 30%,transparent);mask-image:linear-gradient(#000 30%,transparent)}
.lock-card{display:flex;gap:18px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px;margin-top:-10px}
.lock-card h3{margin:0 0 6px;font-size:19px}.lock-card p{margin:0 0 16px}
.lock-ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);flex:none}
.lock-plans,.co-plans{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.lp{display:flex;flex-direction:column;gap:2px;align-items:flex-start;text-align:start;border:1.5px solid var(--line);background:var(--paper);border-radius:12px;padding:12px;color:var(--ink);position:relative}
.lp b{font-size:14px}.lp span{font-weight:700;font-size:13.5px;color:var(--accent)}.lp small{font-size:11.5px;color:var(--ink-3)}
.lp.best{border-color:color-mix(in srgb,var(--accent) 60%,var(--line))}
.lp.on{border-color:var(--accent);background:var(--accent-soft)}
.lp:hover{border-color:var(--accent)}
.lock-free{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;margin-top:14px;font-size:13px}
.co .co-sum{display:flex;justify-content:space-between;align-items:center;border-top:1px dashed var(--line);border-bottom:1px dashed var(--line);padding:10px 0;font-size:13.5px}
.co .co-sum b{font-size:16px;color:var(--accent)}
.auth.co{width:min(520px,94vw)}
/* pricing */
.pr-head{max-width:640px;margin:18px 0 26px}.pr-head h1{font-size:38px}.pr-head p{margin:8px 0 0}
.pr-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:28px}
.pr-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px;display:flex;flex-direction:column;gap:8px}
.pr-card.best{border-color:var(--accent);box-shadow:0 20px 50px -30px var(--glow)}
.pr-card h3{margin:0;font-size:18px}
.pr-price{font-family:var(--f-display);font-size:32px;line-height:1.3}
.pr-note{font-size:13px;color:var(--accent);margin-bottom:10px;flex:1}
.pr-tag{position:absolute;top:-11px;inset-inline-start:20px;background:var(--accent);color:var(--accent-ink);font-size:11.5px;font-weight:700;padding:2px 10px;border-radius:99px}
.pr-cmp{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:16px;margin-bottom:28px}
.pr-cmp table{width:100%;border-collapse:collapse;font-size:14px}
.pr-cmp th,.pr-cmp td{padding:11px 16px;border-bottom:1px solid var(--sunk);text-align:center}
.pr-cmp th:first-child,.pr-cmp td:first-child{text-align:start}
.pr-cmp td.y{color:var(--ga);font-weight:700}.pr-cmp th{color:var(--ink-3);font-weight:500}
.pr-faq{max-width:760px;margin-bottom:70px}.pr-faq h3{font-size:18px}
.pr-faq details{border-bottom:1px solid var(--line);padding:12px 0}.pr-faq summary{cursor:pointer;font-weight:600}.pr-faq p{margin:8px 0 0;color:var(--ink-2)}
/* goals */
.goal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-bottom:40px}
.goal{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--c);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:10px}
.goal.on{box-shadow:0 0 0 1px var(--c),0 20px 40px -28px var(--c)}
.goal h3{margin:0;font-size:17px}.goal p{margin:0;color:var(--ink-2);font-size:13.5px;flex:1}
.goal-top{display:flex;gap:6px}.chip.on{background:var(--accent-soft);color:var(--accent);font-weight:700}
.goal-cs{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.glyph.sm{width:26px;height:26px;font-size:10px;border-radius:7px}
.gb{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:26px;margin-bottom:70px}
.gb-h{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:16px}
.gb-h h2{font-size:26px}.gb-h p{margin:6px 0 0}
.gb-sel{display:flex;flex-direction:column;align-items:center;background:var(--sunk);border-radius:14px;padding:10px 18px}
.gb-sel b{font-family:var(--f-display);font-size:30px;color:var(--accent);line-height:1.2;font-weight:400}.gb-sel span{font-size:12px;color:var(--ink-3)}
.gb-lock{display:flex;gap:10px;align-items:center;background:var(--saffron-soft);color:var(--saffron);border-radius:12px;padding:10px 14px;margin-bottom:14px;flex-wrap:wrap}
.gb-lock span{color:var(--ink);flex:1}
.gb-body{display:grid;grid-template-columns:220px minmax(0,1fr) 300px;gap:16px}
.gb-body.dim{opacity:.55}
.gb-courses{display:flex;flex-direction:column;gap:4px}
.gb-courses button{display:flex;gap:8px;align-items:center;text-align:start;border:1px solid transparent;background:none;border-radius:10px;padding:7px 8px;font-size:13px;color:var(--ink-2)}
.gb-courses button span.num{margin-inline-start:auto}
.gb-courses button.on{background:var(--sunk);border-color:var(--line);color:var(--ink);font-weight:600}
.gb-list{max-height:460px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:6px}
.gb-part{font-size:12px;font-weight:700;color:var(--ink-3);padding:10px 8px 4px}
.gb-l{display:grid;grid-template-columns:26px 1fr;gap:2px 10px;width:100%;text-align:start;background:none;border:0;border-radius:9px;padding:7px 8px;font-size:13.5px;color:var(--ink)}
.gb-l .ltr{grid-column:2;font-size:11.5px}
.gb-l:hover{background:var(--sunk)}.gb-l.on{background:var(--accent-soft)}
.gb-ck{grid-row:span 2;width:22px;height:22px;border-radius:7px;border:1.5px solid var(--line);display:grid;place-items:center;font-size:11.5px;font-weight:700}
.gb-l.on .gb-ck{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.gb-form{display:flex;flex-direction:column;gap:12px}
.gb-form label,.rq-form label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--ink-2)}
.gb-form input,.rq-form input,.rq-form textarea{background:var(--sunk);border:1px solid var(--line);border-radius:10px;padding:10px 12px;font:inherit;color:var(--ink);outline:none}
.gb-form input:focus,.rq-form input:focus,.rq-form textarea:focus{border-color:var(--accent)}
.gb-picked{display:flex;flex-wrap:wrap;gap:6px;max-height:220px;overflow:auto}
.gb-picked .chip button{background:none;border:0;color:var(--ink-3);padding:0 2px}
/* requests */
.rq{display:grid;grid-template-columns:340px minmax(0,1fr);gap:20px;margin-bottom:70px;align-items:start}
.rq-form{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:12px;position:sticky;top:84px}
.rq-form h3{margin:0;font-size:17px}.rq-form textarea{min-height:70px;resize:vertical}
.rq-sort{display:flex;gap:6px;margin-bottom:10px}
.rq-sort button,.dfilter button{border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:99px;padding:5px 14px;font-size:13px;display:inline-flex;gap:6px;align-items:center}
.rq-sort button.on,.dfilter button.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.dfilter button span{font-size:11px;opacity:.7}
.rq-item{display:grid;grid-template-columns:58px minmax(0,1fr) auto;gap:14px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:10px}
.rq-item p{margin:4px 0;font-size:13.5px;color:var(--ink-2)}.rq-item a{font-size:12px}
.vote{display:flex;flex-direction:column;align-items:center;gap:2px;border:1.5px solid var(--line);background:var(--paper);border-radius:12px;padding:8px 0;color:var(--ink-2)}
.vote b{font-size:15px}.vote:hover{border-color:var(--accent);color:var(--accent)}
.vote.on{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
/* report card */
.goalbar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:20px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:18px 22px;margin-bottom:16px}
.goalbar .ring{width:72px;height:72px}
.gbar-t{display:flex;flex-direction:column;gap:4px;min-width:0}.gbar-t b{font-size:19px}
.gbar-n{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:13px;color:var(--ink-2)}
.gbar-n span{display:inline-flex;gap:5px;align-items:center}.gbar-n .t-read{color:var(--read)}.gbar-n .t-quiz{color:var(--quiz)}
.gbar-n svg{width:14px;height:14px}
.gbar-a{display:flex;flex-direction:column;gap:8px;align-items:stretch}
.bands{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}
.band{display:flex;flex-direction:column;align-items:flex-start;gap:0;text-align:start;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 14px;color:var(--ink-2);border-inline-start:4px solid currentColor}
.band b{font-family:var(--f-display);font-size:28px;font-weight:400;line-height:1.2;color:inherit}
.band span{color:var(--ink);font-weight:600;font-size:13.5px}.band small{font-size:11.5px;color:var(--ink-3)}
.band.on{background:var(--sunk);box-shadow:0 0 0 1px currentColor}
.dfilter{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.dlist{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:6px 14px}
.dgroup+.dgroup{border-top:1px solid var(--line)}
.dg-h{display:flex;gap:8px;align-items:center;font-weight:700;padding:12px 0 6px;font-size:14px}
.di{display:grid;grid-template-columns:28px minmax(0,1fr) auto 110px;gap:12px;align-items:center;padding:9px 0;border-top:1px solid var(--sunk)}
.di a{color:var(--ink);min-width:0}.di a:hover{text-decoration:none;color:var(--accent)}
.di b{display:block;font-weight:500;font-size:14px}.di small{font-size:11.5px;color:var(--ink-3)}
.di-st{width:24px;height:24px;border-radius:7px;border:1.5px dashed var(--line);display:grid;place-items:center;color:var(--read)}
.di.is-read .di-st{border:1.5px solid var(--read);background:var(--read-soft)}
.di-st svg{width:14px;height:14px}
.di-st.q{border:0;background:var(--quiz-soft);color:var(--quiz)}
.di-tag{font-size:12px;font-weight:600;text-align:center;color:var(--ink-3);border-radius:99px;padding:2px 8px;border:1px solid var(--line)}
.di-tag.r{color:var(--read);border-color:color-mix(in srgb,var(--read) 50%,transparent)}
.di-tag[class*="g-t-"]{border-color:currentColor}
.di.is-left b{color:var(--ink-2)}
.quests{margin-top:16px}
.has-x .fa::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--ga);margin-inline-end:6px;vertical-align:middle;box-shadow:0 0 8px var(--ga)}
.xcov{display:flex;flex-direction:column;gap:6px}
.answer .who svg{width:15px;height:15px;color:var(--accent)}
@media (max-width:1100px){.gb-body{grid-template-columns:1fr}.gb-courses{flex-direction:row;flex-wrap:wrap}.rq{grid-template-columns:1fr}.rq-form{position:static}}
@media (max-width:820px){
  .nav{display:none}
  .lock-plans,.co-plans,.pr-grid{grid-template-columns:1fr}
  .lock-card{flex-direction:column;padding:18px}
  .bands{grid-template-columns:1fr 1fr}
  .goalbar{grid-template-columns:auto 1fr}.gbar-a{grid-column:1/-1}
  .di{grid-template-columns:24px minmax(0,1fr) auto}.di .exchip{display:none}
  .strip .use{flex-basis:78%}
  .car-btn{display:none}
  .gb{padding:18px}.gb-h{flex-direction:column}
}
.btn{white-space:nowrap}

/* ===== v6: constellation hero, AI on selection, reading levels, about, python docs ===== */
.h-sub{font-family:var(--f-display);font-size:22px!important;color:#2EE6B8!important;margin:-6px 0 14px!important;letter-spacing:.01em}
.cons{position:relative;display:flex;flex-direction:column;align-items:center;gap:14px;outline:none}
.cons-ring{position:relative;width:min(440px,100%);aspect-ratio:1;max-width:100%}
.cons-cv{position:absolute;inset:0;width:100%;height:100%}
.cons-core{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:2px;filter:drop-shadow(0 0 22px rgba(46,230,184,.55))}
.cons-core span{font-family:var(--f-display);font-size:15px;color:#E9FFF8}
.cons-node{position:absolute;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:4px;background:none;border:0;color:#9FB4C6;padding:0;cursor:pointer}
.cons-node svg{width:42px;height:42px;padding:10px;border-radius:50%;background:rgba(11,17,24,.85);border:1px solid rgba(56,189,248,.35);transition:all .25s}
.cons-node span{font-size:11.5px;white-space:nowrap;background:rgba(5,8,13,.6);padding:0 6px;border-radius:6px}
.cons-node:hover svg{border-color:#2EE6B8;color:#2EE6B8}
.cons-node.on{color:#E9FFF8}.cons-node.on svg{background:#2EE6B8;color:#03140F;border-color:#2EE6B8;box-shadow:0 0 0 6px rgba(46,230,184,.15),0 0 30px rgba(46,230,184,.6)}
.cons-node:focus-visible svg{outline:2px solid #F5B841}
.cons-card{display:grid;grid-template-columns:150px minmax(0,1fr);gap:14px;align-items:center;width:min(480px,100%);background:rgba(11,17,24,.78);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:10px;color:#E9F1F7;touch-action:pan-y;cursor:grab;user-select:none;transition:transform .2s,opacity .2s}
.cons-card.in{animation:cin .45s ease}
@keyframes cin{from{opacity:0;transform:translateY(6px)}}
.cc-art{aspect-ratio:16/10;border-radius:10px;overflow:hidden;max-width:100%}.cc-art svg{width:100%;height:100%;display:block;pointer-events:none}
.cc-t{display:flex;flex-direction:column;gap:2px;min-width:0}
.cc-ind{display:inline-flex;gap:6px;align-items:center;font-size:12px;color:#2EE6B8;font-weight:600}.cc-ind svg{width:16px;height:16px}
.cc-t b{font-size:15px;line-height:1.6}.cc-t small{color:#9FB4C6;font-size:12px}
.cc-link{font-size:12.5px;color:#F5B841;margin-top:2px}
.cons-nav{display:flex;align-items:center;gap:12px;color:#9FB4C6;font-size:12.5px}
.cons-nav button{width:32px;height:32px;border-radius:50%;border:1px solid rgba(255,255,255,.18);background:rgba(5,8,13,.5);color:#E9F1F7;font-size:18px;line-height:1}
.cons-nav button:hover{border-color:#2EE6B8;color:#2EE6B8}
/* reading levels */
.seg{flex-wrap:wrap}.seg button{padding:5px 11px}
.plus-tag{display:inline-block;font-size:11px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:6px;padding:0 6px;margin-inline-end:6px;vertical-align:middle}
.plus-note{font-size:13px;line-height:1.9;background:var(--accent-soft);border-radius:12px;padding:10px 14px;margin-bottom:20px;color:var(--ink)}
.mode-enplus .blk .fa{display:none}.mode-enplus .blk .en{display:block;color:var(--ink);font-size:15.5px}
.prq{display:inline-flex;align-items:center;gap:4px;font-size:.88em;border:1px dashed var(--accent);border-radius:7px;padding:0 6px;margin-inline:2px}
.prq::before{content:"پیش‌نیاز";font-size:10px;font-weight:700;color:var(--ink-3)}
.prq:hover{text-decoration:none;background:var(--accent-soft)}
/* AI on selection */
.selbar{position:fixed;z-index:70;display:flex;align-items:center;gap:4px;background:var(--surface);border:1px solid var(--accent);border-radius:12px;padding:4px;box-shadow:0 14px 40px -12px rgba(0,0,0,.7)}
.selbar>span{color:var(--accent);display:grid;place-items:center;padding:0 4px}.selbar svg{width:16px;height:16px}
.selbar button{border:0;background:none;color:var(--ink);font-size:12.5px;padding:6px 9px;border-radius:8px;white-space:nowrap}
.selbar button:hover{background:var(--accent-soft);color:var(--accent)}
.ai-how{display:flex;gap:8px;align-items:flex-start;font-size:12.5px;color:var(--ink-2);line-height:1.8}.ai-how svg{flex:none;color:var(--accent);width:16px;height:16px;margin-top:3px}
.ai-quote{font-size:13px;line-height:1.9;background:var(--sunk);border-inline-start:3px solid var(--accent);border-radius:8px;padding:10px 12px}
.ai-quote.empty{color:var(--ink-3);border-inline-start-color:var(--line)}
.ai-kinds{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.ai-kinds button{background:var(--paper);border:1px solid var(--line);border-radius:9px;padding:8px 10px;text-align:start;font-size:13px;font-weight:600;display:flex;flex-direction:column;gap:1px;color:var(--ink)}
.ai-kinds button small{font-weight:400;color:var(--ink-3);font-size:11px}
.ai-kinds button:hover:not([disabled]){border-color:var(--accent)}.ai-kinds button.on{border-color:var(--accent);background:var(--accent-soft)}
.ai-kinds button[disabled]{opacity:.5}
.ai-kinds button:last-child{grid-column:1/-1}
.ai-lock{display:flex;flex-direction:column;gap:8px;align-items:flex-start;padding:10px 0;color:var(--accent)}.ai-lock b{color:var(--ink)}.ai-lock p{margin:0}
.ai-src{font-size:11.5px}
.assist .tabs button{padding:10px 10px;font-size:13px}
.assist .composer{border-top:0;padding:0}
/* google button */
.gbtn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;background:#fff;color:#1F1F1F;border:1px solid #DADCE0;border-radius:10px;padding:10px;font-weight:600;font-size:14px}
.gbtn:hover{box-shadow:0 1px 6px rgba(0,0,0,.25)}
/* petitions */
.pet{display:flex;align-items:center;gap:10px;margin:6px 0}.pet .bar{flex:1;max-width:260px}
/* about */
.ab-hero{position:relative;overflow:hidden;background:radial-gradient(700px 400px at 30% 20%,rgba(46,230,184,.14),transparent 60%),#04070B;color:#E9F1F7;border-bottom:1px solid #121C27}
.ab-hero #nn{position:absolute;inset:0;width:100%;height:100%}
.ab-in{position:relative;padding-block:80px 70px;max-width:820px;margin-inline-start:auto}
.ab-in h1{font-size:52px;margin:10px 0 16px;color:#fff}.ab-in h1 .grad{background:linear-gradient(90deg,#2EE6B8,#38BDF8,#A78BFA);-webkit-background-clip:text;background-clip:text;color:transparent}
.ab-in p{font-size:17px;color:#A6B5C4;line-height:2;max-width:40em}
.ab{padding-block:40px 20px}
.ab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:40px}
.ab-grid>div{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:8px;align-items:flex-start}
.ab-grid h3{margin:0;font-size:18px}.ab-grid p{margin:0;color:var(--ink-2);line-height:1.95}
.ab-n{font-family:var(--f-display);font-size:28px;color:var(--accent);line-height:1}
.ab-soon{background:radial-gradient(500px 240px at 10% 0%,rgba(167,139,250,.18),transparent 70%),var(--surface);border:1px solid var(--line);border-radius:20px;padding:28px;margin-bottom:40px}
.ab-soon h2{font-size:28px;margin:10px 0}.ab-soon p{color:var(--ink-2);max-width:46em;line-height:2}
.ab-flow{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px}
.ab-flow span{display:inline-flex;gap:6px;align-items:center;border:1px solid var(--line);border-radius:99px;padding:5px 14px;font-size:13px;background:var(--paper)}
.ab-flow i{width:40px;height:2px;background:linear-gradient(90deg,var(--accent),var(--plum));border-radius:2px}
.ab-contact{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;margin-bottom:60px}
.ab-contact h2{font-size:28px}
.mailbox{display:flex;gap:10px;align-items:center;flex-wrap:wrap;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-top:12px}
.mailbox span{font-size:16px;font-weight:600;user-select:all}
/* python docs (docs.python.org layout, site theme) */
.pyd-bar{background:var(--surface);border-bottom:1px solid var(--line);font-size:13px;position:sticky;top:calc(64px + env(safe-area-inset-top,0px));z-index:8}
.pyd-bar-in{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding-block:7px}
.pyd-brand{display:inline-flex;align-items:center;gap:6px;color:var(--ink)}
.pyd-mark{width:24px;height:24px;border-radius:6px;display:grid;place-items:center;font-family:var(--f-latin);font-weight:700;font-size:11px;background:linear-gradient(135deg,#3B6FA0,#F5C542);color:#fff}
.pyd-sep{color:var(--ink-3)}.pyd-sp{flex:1}
.pyd-sel select{background:var(--sunk);color:var(--ink);border:1px solid var(--line);border-radius:7px;padding:3px 6px;font:inherit;font-size:12.5px}
.pyd-search{border:1px solid var(--line);background:var(--sunk);color:var(--ink-2);border-radius:8px;padding:4px 10px;font-size:12.5px;display:inline-flex;gap:8px;align-items:center}
.pyd{padding-block:24px 40px}
.pyd-home h1,.pyd-main h1{font-size:30px;font-weight:800;margin:6px 0 10px;position:relative}
.pyd-lead{font-size:16px;color:var(--ink-2);max-width:52em;line-height:2}
.pyd-status{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.pyd-home h2{font-size:18px;margin:26px 0 12px;font-weight:700}
.pyd-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:4px 28px}
.pyd-card{display:grid;grid-template-columns:1fr auto;grid-template-areas:"b i" "e i" "s i";padding:10px 4px;border-bottom:1px solid var(--sunk);color:var(--ink)}
.pyd-card b{grid-area:b;color:var(--accent);font-weight:700}.pyd-card .ltr{grid-area:e;font-size:12px;color:var(--ink-3)}.pyd-card small{grid-area:s;color:var(--ink-2);font-size:13px}
.pyd-card i{grid-area:i;align-self:center;font-style:normal;font-size:11px;color:var(--ink-3);border:1px dashed var(--line);border-radius:99px;padding:1px 8px}
.pyd-card.soon b{color:var(--ink-2)}.pyd-card:hover{text-decoration:none;background:var(--sunk)}
.pyd-cols{display:grid;grid-template-columns:1fr 1fr;gap:28px}.pyd-cols ul{margin:0;padding-inline-start:20px;line-height:2.1;color:var(--ink-2)}
.pyd-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:36px}
.pyd-side{font-size:13px;position:sticky;top:120px;align-self:start;max-height:calc(100vh - 140px);overflow:auto;display:flex;flex-direction:column;gap:4px}
.pyd-side h3{font-size:13.5px;margin:14px 0 4px;color:var(--ink)}.pyd-side p{margin:0}
.pyd-side ul{list-style:none;margin:0;padding-inline-start:12px;line-height:1.9}.pyd-local{padding-inline-start:0!important}
.pyd-side a{color:var(--ink-2)}.pyd-side a:hover{color:var(--accent)}
.pyd-this{padding-inline-start:0!important}
.pyd-main{min-width:0;max-width:820px;font-size:15.5px;line-height:2.05}
.pyd-main.pyd-solo{max-width:860px}
.pyd-main p{margin:0 0 14px}
.pyd-main code{font-family:var(--f-mono);font-size:.86em;background:var(--sunk);border-radius:5px;padding:1px 5px;direction:ltr;unicode-bidi:isolate}
.pyd-main h2{font-size:23px;margin:34px 0 12px;font-weight:800}.pyd-main h3{font-size:19px;margin:26px 0 10px;font-weight:700}
.pyd-en{font-size:13px;font-weight:400;color:var(--ink-3);margin-inline-start:8px}
.pyd-pil{opacity:0;margin-inline-start:8px;color:var(--ink-3);font-weight:400}
h1:hover .pyd-pil,h2:hover .pyd-pil,h3:hover .pyd-pil{opacity:1}
.pyd-meta{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:12.5px;color:var(--ink-3);padding-bottom:14px;margin-bottom:18px;border-bottom:1px solid var(--line)}
.pyd-code{direction:ltr;border:1px solid color-mix(in srgb,#9FE870 30%,var(--line));background:color-mix(in srgb,#EEFFCC 7%,var(--code-bg));border-radius:10px;margin:0 0 16px;overflow:hidden}
:root[data-theme="light"] .pyd-code{background:#F3FBE6;border-color:#D7EBB8}
:root[data-theme="light"] .pyd-code pre{color:#14211E}
.pyd-code-h{display:flex;justify-content:space-between;align-items:center;padding:4px 10px;font-family:var(--f-latin);font-size:11.5px;color:#8FA39D;border-bottom:1px solid color-mix(in srgb,#9FE870 18%,transparent)}
.pyd-acts{display:flex;gap:6px}
.pyd-code-h button{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#C9D6D2;border-radius:6px;padding:1px 9px;font-size:11.5px;font-family:var(--f-body)}
:root[data-theme="light"] .pyd-code-h button{background:#fff;border-color:#D7EBB8;color:#2C4A3A}
.pyd-code-h button[data-runrepl]{color:#2EE6B8;border-color:rgba(46,230,184,.4)}
.pyd-code pre{margin:0;padding:10px 14px;font-family:var(--f-mono);font-size:13px;line-height:1.75;color:#DDE7E3;overflow-x:auto}
.pyd-code .pr{color:#C65D09;font-weight:700;user-select:none}.pyd-code .go{color:#9FB4C6}
:root[data-theme="light"] .pyd-code .go{color:#333}
.pyd-out{border-top:1px dashed rgba(46,230,184,.35);background:rgba(46,230,184,.05)}
.pyd-out-h{font-size:11px;color:#2EE6B8;padding:4px 14px 0;font-family:var(--f-body);direction:rtl}
.pyd-out .err,.pyd-code .err{color:var(--gc)}
.pyd-note{direction:rtl;border:1px solid var(--line);border-inline-start:3px solid var(--saffron);background:var(--surface);border-radius:8px;padding:10px 14px;font-size:14px;margin:0 0 14px}
.pyd-note b{display:block;color:var(--saffron);font-size:12.5px}
.pyd-fn{display:flex;gap:10px;font-size:13.5px;color:var(--ink-2)}.pyd-fn p{margin:0}
.pyd-main hr{border:0;border-top:1px solid var(--line);margin:30px 0 14px}
.pyd-pn{display:flex;justify-content:space-between;gap:12px;margin-top:30px;padding-top:16px;border-top:1px solid var(--line)}
.pyd-pn a{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:10px;padding:8px 14px;color:var(--ink);font-size:14px}.pyd-pn small{color:var(--ink-3)}
.pyd-toc ul{line-height:2.2}.pyd-toc ul ul{font-size:14px}
.pyd-foot{border-top:1px solid var(--line);padding-block:20px;color:var(--ink-3);font-size:12.5px}
@media (max-width:1100px){.ab-contact{grid-template-columns:1fr}}
@media (max-width:900px){.pyd-layout{grid-template-columns:1fr}.pyd-side{position:static;max-height:none;border-bottom:1px solid var(--line);padding-bottom:12px}.pyd-grid,.pyd-cols{grid-template-columns:1fr}}
@media (max-width:820px){
  .cons-card{grid-template-columns:110px minmax(0,1fr)}.cons-node span{font-size:10px}.cons-node svg{width:36px;height:36px;padding:8px}
  .ab-in h1{font-size:36px}.ab-grid{grid-template-columns:1fr}
  .selbar{flex-wrap:wrap;max-width:calc(100vw - 16px)}
  .pyd-bar{position:static}.pyd-sp{display:none}
  .h-sub{font-size:18px!important}
}

/* ===== v7: W3Schools-style tree, chapter outline, focus mode, exam hall, AI heading fx ===== */
/* tree */
.wtree{display:flex;flex-direction:column;font-size:13.5px}
.wt-h{font-weight:800;font-size:14px;padding:10px 12px 8px;color:var(--ink);display:flex;flex-direction:column;gap:0}
.wt-h .ltr{font-size:11px;font-weight:400;color:var(--ink-3)}
.wt-h.link:hover{text-decoration:none;color:var(--accent)}
.wt-g{border-top:1px solid var(--sunk)}
.wt-part{display:flex;align-items:center;gap:8px;width:100%;background:none;border:0;text-align:start;padding:9px 10px;font-weight:700;color:var(--ink);font-size:13px}
.wt-part:hover{background:var(--sunk)}
.wt-pn{min-width:26px;height:22px;border-radius:6px;display:grid;place-items:center;font-family:var(--f-latin);font-size:11px;background:var(--accent-soft);color:var(--accent);flex:none}
.wt-cnt{margin-inline-start:auto;font-size:11px;color:var(--ink-3);font-weight:500}
.wt-c{color:var(--ink-3);font-weight:400;transition:transform .2s;display:inline-block}
.wt-g.open .wt-c{transform:rotate(-90deg)}
.wt-items{padding-bottom:6px}
.wt-i{display:flex;align-items:center;gap:8px;padding:6px 12px;color:var(--ink-2);border:0;background:none;width:100%;text-align:start;font:inherit;font-size:13px;line-height:1.7;border-inline-start:3px solid transparent}
.wt-i:hover{background:var(--sunk);color:var(--ink);text-decoration:none}
.wt-i.on{background:var(--accent);color:var(--accent-ink);font-weight:700;border-inline-start-color:var(--accent)}
.wt-i.on .wt-n{color:var(--accent-ink);opacity:.8}
.wt-i.ch{font-weight:600;color:var(--ink)}.wt-i.dim{color:var(--ink-3)}
.wt-n{font-size:11px;color:var(--ink-3);min-width:18px}
.wt-i .wt-ok{margin-inline-start:auto;color:var(--read);display:grid}.wt-i.on .wt-ok{color:var(--accent-ink)}
.wt-i .wt-lk{margin-inline-start:auto;color:var(--ink-3);display:grid}
.wt-i.lock{color:var(--ink-3)}
.wt-sub{border-inline-start:1px dashed var(--line);margin-inline-start:22px}
.wt-i.s{font-size:12.5px;padding:3px 12px}
.wt-i.exam{margin:4px 8px 0;width:calc(100% - 16px);border:1px dashed color-mix(in srgb,var(--quiz) 60%,transparent);border-radius:9px;color:var(--quiz);font-weight:700;background:color-mix(in srgb,var(--quiz-soft) 60%,transparent)}
.wt-i.exam:hover{background:var(--quiz-soft);color:var(--quiz)}
.wt-i.exam svg{width:15px;height:15px}
.toc{padding:8px 0 30px}
/* docs layouts */
.pyd-layout2{display:grid;grid-template-columns:250px minmax(0,1fr);gap:30px}
.pyd-layout3{display:grid;grid-template-columns:240px minmax(0,1fr) 210px;gap:30px}
.pyd-layout2 .wtree,.pyd-layout3 .wtree{position:sticky;top:120px;max-height:calc(100vh - 140px);overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding-bottom:10px;align-self:start}
.pyd-tools{display:flex;justify-content:flex-end;margin-bottom:-6px}
.chap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:20px}
.chap{display:flex;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px 14px;color:var(--ink)}
.chap:hover{text-decoration:none;border-color:var(--accent)}
.chap-n{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-weight:800;background:linear-gradient(135deg,var(--accent-soft),transparent);color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent);flex:none}
.chap-t{display:flex;flex-direction:column;min-width:0;flex:1}.chap-t b{font-size:14px}.chap-t small{font-size:11.5px;color:var(--ink-3)}
.chap.queued{opacity:.75}
/* course outline: chapter cards + timeline */
.part{border-radius:16px;margin-bottom:14px;border:1px solid var(--line);background:var(--surface)}
.part-h{padding:16px 20px;gap:16px}
.part-n{min-width:52px;height:52px;border-radius:14px;font-size:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;background:linear-gradient(135deg,color-mix(in srgb,var(--c, var(--accent)) 28%,transparent),transparent);border:1px solid color-mix(in srgb,var(--c, var(--accent)) 40%,transparent);color:var(--c, var(--accent));line-height:1.1;padding:0}
.part-n::before{content:"فصل";font-family:var(--f-body);font-size:10px;font-weight:600;color:var(--ink-3)}
.part-h h3{font-size:17px}
.part.open{box-shadow:0 18px 40px -30px rgba(0,0,0,.7)}
.lessons{position:relative;padding:6px 0 10px}
.lessons::before{content:"";position:absolute;top:10px;bottom:70px;inset-inline-start:62px;width:2px;background:linear-gradient(var(--accent-soft),var(--line))}
.lesson.v3{border-top:0!important;padding:10px 20px;grid-template-columns:96px minmax(0,1fr) auto 110px}
.lesson.v3 .lrow-link{grid-template-columns:34px minmax(0,1fr)}
.lesson.v3 .ln{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--paper);border:2px solid var(--line);font-size:11.5px;position:relative;z-index:1;color:var(--ink-2)}
.lesson.v3 .lt div{font-size:15px;font-weight:600}
.lesson.v3:hover .ln{border-color:var(--accent);color:var(--accent)}
.qrow{margin:8px 16px 4px;border-radius:14px;border:1px dashed color-mix(in srgb,var(--quiz) 55%,transparent)}
/* focus reading mode */
.focus-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:9px;padding:5px 11px;font-size:12.5px}
.focus-btn:hover{border-color:var(--accent);color:var(--accent)}
.focus-btn.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
body.focus .top,body.focus .toc,body.focus .assist,body.focus .pyd-bar,body.focus .wtree,body.focus .pyd-side,body.focus .lsteps,body.focus .crumbs,body.focus .lesson-nav,body.focus .pyd-pn,body.focus footer{opacity:.12;filter:saturate(.3);transition:opacity .35s,filter .35s}
body.focus .top:hover,body.focus .toc:hover,body.focus .assist:hover,body.focus .pyd-bar:hover,body.focus .wtree:hover,body.focus .pyd-side:hover{opacity:.9;filter:none}
body.focus .article,body.focus .pyd-main{background:radial-gradient(900px 500px at 50% 0%,rgba(46,230,184,.05),transparent 70%)}
body.focus .article .blk .fa,body.focus .pyd-main p{font-size:17.5px;line-height:2.15}
body.focus .modebar{background:transparent;border-bottom-color:transparent}
/* exam card */
.exam-card{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:16px;align-items:center;background:radial-gradient(400px 160px at 100% 0%,rgba(167,139,250,.16),transparent 70%),var(--surface);border:1px solid color-mix(in srgb,var(--quiz) 45%,var(--line));border-radius:18px;padding:16px 20px;margin:10px 0 30px}
.ec-hg .hg{width:44px;height:66px}
.ec-t{display:flex;flex-direction:column;gap:3px;min-width:0}.ec-t b{font-size:17px}.ec-t small{color:var(--ink-3)}
.ec-t .eyebrow{color:var(--quiz)}.ec-t .score{align-self:flex-start;margin-top:4px}
/* hourglass */
.hg{width:90px;height:135px;overflow:visible}
.hg-glass{fill:rgba(255,255,255,.04);stroke:rgba(159,255,230,.55);stroke-width:1.5}
.hg-top{transform-box:fill-box;transform-origin:50% 100%;transform:scaleY(calc(1 - var(--p)));transition:transform .12s linear}
.hg-bot{transform-box:fill-box;transform-origin:50% 100%;transform:scaleY(var(--p));transition:transform .12s linear}
.hg-stream{stroke:#9FFFE6;stroke-width:1.6;stroke-dasharray:2 5;animation:hgs .6s linear infinite}
@keyframes hgs{to{stroke-dashoffset:-14}}
.hg-neur circle{fill:#F5B841}.hg-neur path{stroke:#F5B841;stroke-width:.6;fill:none;opacity:.7}
.hg.late .hg-glass{stroke:#F87171}.hg.late{animation:hgl .8s ease-in-out infinite}
@keyframes hgl{50%{filter:drop-shadow(0 0 12px rgba(248,113,113,.7))}}
.hg.sm .hg-stream{animation-duration:1.2s}
/* exam hall */
body.in-hall{overflow:hidden}
body.in-hall>header,body.in-hall>main{filter:blur(6px) brightness(.35);transition:filter .5s}
.hall{position:fixed;inset:0;z-index:90;display:flex;flex-direction:column;color:#E9F1F7;padding:env(safe-area-inset-top,0) max(16px,env(safe-area-inset-right,0px)) env(safe-area-inset-bottom,0) max(16px,env(safe-area-inset-left,0px));animation:hallin .5s ease}
@keyframes hallin{from{opacity:0}}
.hall-bg{position:absolute;inset:0;background:radial-gradient(800px 500px at 50% 0%,rgba(46,230,184,.12),transparent 60%),radial-gradient(700px 400px at 50% 100%,rgba(167,139,250,.12),transparent 60%),rgba(3,6,10,.94);z-index:-1}
.hall-bg::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse at center,#000 20%,transparent 75%)}
.hall-top{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.08);max-width:1000px;width:100%;margin:0 auto}
.hall-t{display:inline-flex;gap:8px;align-items:center;font-weight:700;color:#C9B8FF}.hall-t svg{width:18px;height:18px}
.hall-top .btn{margin-inline-start:auto;color:#E9F1F7;border-color:rgba(255,255,255,.2)}
.hall-dots{display:flex;gap:5px}.hall-dots i{width:26px;height:6px;border-radius:9px;background:rgba(255,255,255,.12)}
.hall-dots .g{background:#2EE6B8}.hall-dots .r{background:#F87171}.hall-dots .cur{background:#F5B841}
.hall-body{flex:1;display:grid;place-items:center;overflow:auto;padding:20px 0}
.hall-card{background:rgba(11,17,24,.85);border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:28px;width:min(720px,100%);box-shadow:0 40px 90px -40px rgba(0,0,0,.9)}
.hall-card .sq-o{background:rgba(255,255,255,.03);border-color:rgba(255,255,255,.12);color:#E9F1F7}
.hall-card .sq-o .k{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.14);color:#E9F1F7}
.hall-card .sq-o.sel{background:rgba(46,230,184,.12);border-color:#2EE6B8}
.hall-card .muted,.hall-card .faint{color:#9FB4C6}
.rules h2{font-size:30px;margin:0 0 4px}.rules ul{margin:18px 0 24px;padding-inline-start:22px;line-height:2.2;color:#C9D6D2}
.btn.big{padding:13px 26px;font-size:16px}
.hall-q{display:grid;grid-template-columns:auto minmax(0,720px);gap:28px;align-items:center;width:min(1000px,100%)}
.hall-clock{display:flex;flex-direction:column;align-items:center;gap:2px}
.hg-sec{font-family:var(--f-display);font-size:40px;line-height:1;color:#9FFFE6}.hall-clock small{color:#9FB4C6}
.hq{font-size:20px;font-weight:700;line-height:1.9;margin:6px 0 18px}
.hall-confirm{position:absolute;inset:0;display:grid;place-items:center;background:rgba(0,0,0,.55);z-index:3}
.hall-confirm>div{background:#0B1118;border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:22px;width:min(380px,92vw)}
.hall-confirm p{margin:6px 0 14px}
.done-h{display:flex;gap:18px;align-items:center;margin-bottom:14px}.done-h .ring{width:96px;height:96px}.done-h h2{font-size:34px;margin:0}
.done-list{margin:0 0 12px;padding-inline-start:0;list-style:none;display:flex;flex-direction:column;gap:6px;font-size:14px}
.done-list li{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border-radius:10px;background:rgba(255,255,255,.03)}
.done-list li span{font-weight:800}.done-list li.ok span{color:#2EE6B8}.done-list li.bad span{color:#F87171}
/* gate */
.gate{position:fixed;inset:0;display:grid;place-items:center;overflow:hidden}
.door{position:absolute;top:0;bottom:0;width:50%;background:linear-gradient(90deg,#060A10,#0B1520);border-inline:1px solid rgba(46,230,184,.25);animation:door 1.6s cubic-bezier(.7,0,.3,1) .5s forwards}
.door.l{left:0}.door.r{right:0;animation-name:doorr}
.door::after{content:"";position:absolute;top:50%;width:6px;height:80px;border-radius:4px;background:#2EE6B8;box-shadow:0 0 20px #2EE6B8;transform:translateY(-50%)}
.door.l::after{right:14px}.door.r::after{left:14px}
@keyframes door{to{transform:translateX(-102%)}}@keyframes doorr{to{transform:translateX(102%)}}
.gate-t{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;animation:gtt 2s ease forwards}
.gate-t b{font-family:var(--f-display);font-size:30px;font-weight:400}.gate-t span{color:#9FB4C6}
.gate-drop .hg{width:70px;height:105px}
@keyframes gtt{0%{opacity:0;transform:scale(.9)}25%{opacity:1;transform:none}85%{opacity:1}100%{opacity:0}}
/* constellation building */
.cons.building .cons-core{opacity:.12;transform:translate(-50%,-50%) scale(.7);transition:all .5s}
.cons-core{transition:all .5s}
.cc-build{color:#F5B841!important}
/* AI heading effects */
.fx{position:relative}
.article h2.fx::after,.pyd-main h2.fx::after,.pyd-main h3.fx::after,.course-head h1.fx::after,.article h1.fx::after,.pyd-main h1.fx::after,.section-head h2.fx::after,.pr-head h1.fx::after,.dash-h h1.fx::after{content:"";position:absolute;inset-inline:0;bottom:-6px;height:2px;background:linear-gradient(270deg,transparent,#2EE6B8 20%,#38BDF8 50%,#A78BFA 80%,transparent);transform:scaleX(0);transform-origin:right;opacity:.8}
.fx.fx-in::after{animation:trace 1.1s cubic-bezier(.2,.8,.2,1) forwards}
@keyframes trace{0%{transform:scaleX(0)}70%{transform:scaleX(1);opacity:.9}100%{transform:scaleX(1);opacity:.35}}
.fx.fx-in{animation:glint 1.4s ease}
@keyframes glint{0%{text-shadow:0 0 0 transparent}35%{text-shadow:0 0 18px rgba(46,230,184,.55)}100%{text-shadow:0 0 0 transparent}}
.dec,.entitle,.en-title,.pyd-en{font-variant-ligatures:none}
@media (prefers-reduced-motion:reduce){.fx.fx-in,.fx.fx-in::after,.door,.gate-t,.hg-stream{animation:none!important}.fx::after{transform:none}.door{display:none}}
@media (max-width:1200px){.pyd-layout3{grid-template-columns:230px minmax(0,1fr)}.pyd-layout3 .pyd-side{display:none}}
@media (max-width:900px){.pyd-layout2,.pyd-layout3{grid-template-columns:1fr}.pyd-layout2 .wtree,.pyd-layout3 .wtree{position:static;max-height:260px}.chap-grid{grid-template-columns:1fr}}
@media (max-width:820px){
  .hall-q{grid-template-columns:1fr;gap:12px}.hall-clock{flex-direction:row;gap:10px}.hall-clock .hg{width:46px;height:70px}.hg-sec{font-size:28px}
  .hall-card{padding:18px}.hq{font-size:17px}.hall-dots i{width:14px}.hall-t{font-size:13px}
  .exam-card{grid-template-columns:auto 1fr}.exam-card .btn{grid-column:1/-1;justify-content:center}
  .lesson.v3{grid-template-columns:auto minmax(0,1fr);padding:8px 12px}.lessons::before{display:none}
  .part-n{min-width:44px;height:44px}
}
/* quantum hourglass */
.qhg{display:block;width:180px;height:270px}
.qhg.sm{width:48px;height:74px}
.gate-drop .qhg{width:90px;height:140px}
.qhg.late{animation:hgl .8s ease-in-out infinite}
.hall-clock .hg-sec{margin-top:4px}
@media (max-width:820px){.hall-clock .qhg{width:60px;height:92px}}
/* v8: عنوان دوره‌ها قابل کلیک + ساعت شنی در جاهای مرتبط */
.sc-title{color:inherit;text-decoration:none;display:inline-flex;align-items:center;gap:10px;transition:color .2s}
.sc-title .sc-arrow{font-size:.6em;opacity:0;transform:translateX(8px);transition:.25s;color:var(--teal,#2EE6B8)}
.sc-title:hover{color:#BFFFEF}.sc-title:hover .sc-arrow{opacity:1;transform:none}
a.en.ltr{display:block;color:inherit;text-decoration:none;opacity:.75}a.en.ltr:hover{opacity:1;text-decoration:underline}
a.dg-h{display:flex;color:inherit;text-decoration:none}a.dg-h:hover{color:var(--teal,#2EE6B8)}
.rules-hg{float:inline-end;margin:-6px 0 8px 12px}.rules-hg .qhg{width:110px;height:165px}
.py-wait{display:flex;align-items:center;gap:12px;direction:rtl}.py-wait .qhg.sm{width:34px;height:52px}
.core-cv{display:block;width:76px;height:96px}
/* v9: بلوک‌های تازهٔ مستندات */
.pyd-ul{margin:8px 0 18px;padding-inline-start:22px;line-height:2}.pyd-ul li{margin-bottom:10px}
.pyd-see{margin:22px 0;padding:16px 18px;border:1px solid rgba(56,189,248,.28);border-inline-start:4px solid #38BDF8;border-radius:12px;background:rgba(56,189,248,.06)}
.pyd-see>b{display:block;margin-bottom:8px;color:#7DD3FC}.pyd-see dt{font-weight:700;margin-top:8px}.pyd-see dd{margin:2px 0 0;color:var(--muted,#9FB3AE)}
.pyd-code.diagram pre{color:#C9F5E8;line-height:1.5}
.pyd-main .squiz,.pyd-main .tryit{margin:26px 0}
/* v10: سلسله‌مراتب سرفصل‌ها، سنجاق، تعویض دوره، AI، عضویت سریع */
.part-hw{display:flex;align-items:stretch;position:relative}
.part-hw .part-h{flex:1;min-width:0}
.part-h h3{font-size:clamp(17px,1.6vw,21px);font-weight:800;line-height:1.5}
.part-n{font-family:var(--f-ui,inherit)}.part-n small{font-size:9.5px;font-weight:600;opacity:.75;line-height:1}
.part-go{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent);border-radius:999px;padding:6px 12px;white-space:nowrap;transition:.2s}
.part-h:hover .part-go{background:var(--accent);color:#04201a}
.part.open .part-go .chev{transform:rotate(-90deg)}.part-go .chev{transition:transform .2s}
.part-h .chev:not(.part-go .chev){display:none}
.part.open{border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.part.open .lessons{border-inline-start:3px solid var(--accent-soft);margin-inline-start:30px}
.pin{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;border:0;border-inline-start:1px solid var(--line);background:none;color:var(--ink-3);padding:0 14px;font-size:10.5px;min-width:64px}
.pin:hover{color:var(--sun,#F5B841)}.pin.on{color:var(--sun,#F5B841)}
.part.pinned .part-n{box-shadow:0 0 0 2px var(--sun,#F5B841)}
.lrow-link{grid-template-columns:40px minmax(0,1fr) auto}
.lgo{font-size:12px;font-weight:700;color:var(--ink-3);padding:4px 10px;border-radius:999px;border:1px solid var(--line);white-space:nowrap;transition:.2s}
.lesson:hover .lgo{color:#04201a;background:var(--accent);border-color:var(--accent)}
/* درخت خواندن */
.wt-part.cur{color:var(--accent)}.wt-part[aria-expanded="true"]{background:var(--accent-soft)}
.wt-g:not(.open) .wt-part{opacity:.82}
.cswitch{position:relative;border-bottom:1px solid var(--line);margin-bottom:6px}
.cs-row{display:flex;align-items:center;gap:6px}.cs-row .wt-h{flex:1;min-width:0}
.cs-btn{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:var(--sunk);color:var(--ink);border-radius:999px;padding:5px 10px;font-size:11.5px;font-weight:700;white-space:nowrap;margin-inline-end:8px}
.cs-btn:hover,.cswitch.open .cs-btn{border-color:var(--accent);color:var(--accent)}
.cs-list{display:flex;flex-direction:column;gap:2px;padding:6px;margin:0 6px 8px;border:1px solid color-mix(in srgb,var(--accent) 40%,var(--line));border-radius:12px;background:var(--surface);box-shadow:0 18px 40px -18px rgba(0,0,0,.6)}
.cs-cap{font-size:11px;color:var(--ink-3);padding:4px 8px}
.cs-list a{display:flex;align-items:center;gap:10px;padding:8px;border-radius:9px;color:var(--ink)}
.cs-list a:hover{background:var(--accent-soft);text-decoration:none}
.cs-list a span:nth-child(2){display:flex;flex-direction:column;min-width:0;flex:1}.cs-list b{font-size:13px}.cs-list small{font-size:11px;color:var(--ink-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cs-list i{font-style:normal;color:var(--accent)}
/* AI */
.selbar .sb-ai{display:inline-flex;align-items:center;gap:5px;background:linear-gradient(135deg,#2EE6B8,#38BDF8);color:#04201a;font-weight:800}
.selbar .sb-ai:hover{color:#04201a;filter:brightness(1.08)}
.ai-stage{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-3);margin:4px 0 8px}
.ai-stage.write{color:var(--accent)}.ai-stage .ok{font-style:normal;color:var(--accent);animation:hgl 1.2s ease-in-out infinite}
.dots{display:inline-flex;gap:3px}.dots b{width:5px;height:5px;border-radius:50%;background:var(--accent);animation:dotb 1s infinite}.dots b:nth-child(2){animation-delay:.15s}.dots b:nth-child(3){animation-delay:.3s}
@keyframes dotb{0%,100%{opacity:.25;transform:translateY(0)}50%{opacity:1;transform:translateY(-3px)}}
.ai-log{margin-top:12px;border-top:1px dashed var(--line);padding-top:10px}
.ai-log-h{display:flex;align-items:center;gap:8px;font-size:12.5px;margin-bottom:6px}.ai-log-h button{margin-inline-start:auto;border:0;background:none;color:var(--accent);font-size:12px}
.ai-log details{border:1px solid var(--line);border-radius:9px;padding:6px 9px;margin-bottom:5px;font-size:12px}
.ai-log summary{cursor:pointer;display:flex;flex-direction:column;gap:1px;list-style:none}.ai-log summary::-webkit-details-marker{display:none}
.ai-log summary span{font-weight:700}.ai-log summary small{color:var(--ink-3)}
.ai-log p{margin:6px 0 4px;line-height:1.8;color:var(--ink-2,var(--ink))}.ai-log a{font-size:11px}
/* عضویت سریع */
.step-h{display:flex;align-items:center;gap:8px;font-weight:800;font-size:13px}.step-h .num{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#04201a;font-size:12px}
.step-h.dim{opacity:.55}
.otp-l{display:flex;flex-direction:column;gap:6px}
.otp-row{display:flex;gap:8px}.otp-row input{flex:1;min-width:0;font-size:16px;letter-spacing:.06em}
.otp-code{text-align:center;letter-spacing:.5em!important;font-size:20px!important}
.otp-err{color:#F87171;font-size:12.5px}.otp-sent{font-size:13px}.otp-again{font-size:12px;text-align:center}
.linkish{border:0;background:none;color:var(--accent);padding:0;font:inherit;cursor:pointer;text-decoration:underline}
.auth-slot .btn svg{width:14px;height:14px;margin-inline-end:4px;vertical-align:-2px}
.auth-ov{overflow-y:auto;overscroll-behavior:contain;padding-block:20px}
.auth-ov>.auth{margin-block:auto;max-height:none}
@media (max-width:600px){.co-plans{grid-template-columns:1fr!important}.co-plans .lp{flex-direction:row;justify-content:space-between;align-items:center}}
/* v11: ترجمهٔ کامل — متن اصلی، ترجمه، توضیح */
.tr-legend{display:flex;flex-wrap:wrap;gap:14px;align-items:center;font-size:12.5px;color:var(--ink-3);margin:14px 0 6px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--sunk)}
.tr-legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-inline-end:6px;vertical-align:-1px}
.lg-en{background:#38BDF8}.lg-fa{background:var(--accent)}.lg-x{background:#F5B841}
.tr-legend .xt{margin-inline-start:auto;border:1px solid var(--line);background:none;color:var(--ink);border-radius:999px;padding:4px 12px;font-size:12px}
.tr-legend .xt.on{border-color:#F5B841;color:#F5B841}
.trdoc{display:flex;flex-direction:column;gap:6px}
.trb{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:22px;padding:10px 12px;border-radius:12px;border:1px solid transparent}
.trb:hover{border-color:var(--line);background:color-mix(in srgb,var(--sunk) 60%,transparent)}
.trb.sel{border-color:var(--accent)}
.trb>.fa{order:1;min-width:0;line-height:2.05;font-size:16px}
.trb>.en{order:2;min-width:0;font-family:var(--f-latin,inherit);font-size:14.5px;line-height:1.75;color:var(--ink-2,#B9C7C3);border-inline-start:2px solid rgba(56,189,248,.35);padding-inline-start:14px;text-align:left}
.trb .en p,.trb .fa p{margin:0 0 8px}.trb .en p:last-child,.trb .fa p:last-child{margin-bottom:0}
.trb .en img,.trb .fa img{max-width:100%;height:auto;border-radius:10px;background:#fff}
.trb .en pre,.trb .fa pre{direction:ltr;text-align:left;background:var(--sunk);border:1px solid var(--line);border-radius:10px;padding:12px;overflow:auto;font-size:13px;line-height:1.6}
.trb table{border-collapse:collapse;width:100%;font-size:13.5px;display:block;overflow-x:auto}.trb th,.trb td{border:1px solid var(--line);padding:6px 8px;vertical-align:top}
.trb .fa table{direction:rtl}
.trb blockquote{margin:0;padding:8px 12px;border-inline-start:3px solid color-mix(in srgb,var(--accent) 50%,transparent);background:var(--sunk);border-radius:8px}
.trb.h{margin-top:18px;align-items:end}.trb.h h1,.trb.h h2,.trb.h h3,.trb.h h4{margin:0;line-height:1.5}
.trb.h .fa h1,.trb.h .fa h2{font-size:24px;font-weight:800}.trb.h .fa h3{font-size:19px}
.trb.h .en h1,.trb.h .en h2,.trb.h .en h3{font-size:15px;font-weight:600;color:#7DD3FC}
.trb .ask{position:absolute;top:8px;inset-inline-start:-34px;opacity:0;transition:.2s}.trb:hover .ask{opacity:1}
.code-fa{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--ink-3);margin-bottom:4px}.code-fa svg{width:14px;height:14px}
.xnote{margin-top:10px;border:1px solid rgba(245,184,65,.35);background:rgba(245,184,65,.07);border-radius:10px;padding:8px 12px;font-size:14.5px;line-height:1.95}
.xnote summary{cursor:pointer;display:flex;align-items:center;gap:6px;color:#F5B841;font-size:12.5px;list-style:none}.xnote summary::-webkit-details-marker{display:none}
.xnote summary svg{width:14px;height:14px}.xnote>div{margin-top:6px}.xnote p{margin:0 0 6px}
.trdoc.nox .xnote{display:none}
.tr-sec{display:flex;align-items:center;gap:10px;margin:26px 0 6px;padding:10px 14px;border-radius:12px;background:linear-gradient(90deg,var(--accent-soft),transparent);font-weight:800}
.tr-sec small{font-weight:400;color:var(--ink-3);font-size:11.5px;margin-inline-start:auto}
code.tex{background:var(--sunk);padding:2px 6px;border-radius:6px;font-size:.92em}
/* حالت‌ها */
.mode-fa .trb{grid-template-columns:1fr}.mode-fa .trb>.en{display:none}
.mode-fa .trb.vis>.en{display:block;order:0;border:0;padding:0}
.mode-orig .trb{grid-template-columns:1fr}.mode-orig .trb>.fa{display:none}.mode-orig .trb>.en{border:0;padding:0;font-size:15.5px}
@media (max-width:900px){.trb{grid-template-columns:1fr;gap:8px}.trb>.en{order:0}.trb .ask{display:none}}
/* v12: ایراد آموزش، آزمونک داخلی، دورهٔ تألیفی */
.errnote{margin-top:10px;border:1px solid rgba(248,113,113,.45);background:rgba(248,113,113,.08);border-radius:10px;padding:8px 12px;font-size:14px;line-height:1.95}
.errnote>b{display:block;color:#F87171;font-size:12.5px;margin-bottom:4px}.errnote p{margin:0 0 6px}.errnote.sm{font-size:13px;margin-top:8px}
.q-en{font-size:13px;color:var(--ink-3);margin-top:4px;text-align:left}.o-en{display:block;font-size:12px;color:var(--ink-3)}
.q-src{display:inline-block;font-size:11px;font-weight:700;padding:1px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);margin-inline-end:8px;vertical-align:2px}
.trq{margin:16px 0}
.nbh{margin-top:40px;background:linear-gradient(90deg,rgba(56,189,248,.16),transparent)}
.own-doc{display:flex;flex-direction:column;gap:12px;margin-top:18px}
.own-h h2{font-size:24px;font-weight:800;margin:22px 0 4px}.own-h h3{font-size:19px;margin:14px 0 2px}
.own-p{line-height:2.1;font-size:16.5px}.own-p p{margin:0 0 10px}
.own-p table{border-collapse:collapse;width:100%;display:block;overflow-x:auto;font-size:14px}.own-p th,.own-p td{border:1px solid var(--line);padding:6px 8px}
.own-code pre{direction:ltr;text-align:left;background:var(--sunk);border:1px solid var(--line);border-radius:12px;padding:14px;overflow:auto;font-size:13px;line-height:1.6;margin:0 0 8px}
.own-call{border-radius:12px;padding:12px 14px;line-height:2;border:1px solid var(--line)}.own-call>b{display:block;font-size:13px;margin-bottom:4px}
.own-call.example{border-color:rgba(46,230,184,.4);background:rgba(46,230,184,.06)}.own-call.example>b{color:var(--accent)}
.own-call.tip{border-color:rgba(56,189,248,.4);background:rgba(56,189,248,.06)}.own-call.tip>b{color:#7DD3FC}
.own-call.warn{border-color:rgba(245,184,65,.45);background:rgba(245,184,65,.07)}.own-call.warn>b{color:#F5B841}
.own-goals{margin:16px 0;padding:12px 16px;border-radius:12px;background:var(--sunk);border:1px solid var(--line)}.own-goals ul{margin:6px 0;padding-inline-start:20px;line-height:2}
.own-ex{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:10px 0;line-height:2}.own-ex-h{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.own-ex-h .num{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#04201a;font-size:12px}
.chip.ind{background:rgba(245,184,65,.12);color:#F5B841}
.own-sol{margin:-6px 0 18px;font-size:13px}.own-sol summary{cursor:pointer;color:var(--ink-3)}.own-sol pre{direction:ltr;text-align:left;background:var(--sunk);padding:12px;border-radius:10px;overflow:auto}
/* v13: فهرست زنده و اسکرول مستقل */
.wtree a.live,.pyd-local a.live{color:var(--accent)!important;background:var(--accent-soft);font-weight:700;position:relative}
.wtree a.live::before,.pyd-local a.live::before{content:"";position:absolute;inset-inline-start:0;top:20%;bottom:20%;width:3px;border-radius:3px;background:var(--accent);box-shadow:0 0 10px var(--accent)}
.toc,.assist-body,.pyd-side,.wtree,.cs-list{overscroll-behavior:contain;scrollbar-width:thin}
.trb,.own-h,.own-p,section[id],.tr-sec,.trq{scroll-margin-top:calc(var(--pydtop,64px) + 24px)}
/* مستندات پایتون: همان چیدمان اتاق مطالعه — فهرست چسبیده به لبه با اسکرول مستقل */
.pyd.pyd-flush{padding:0}
.pyd-flush .pyd-layout2{grid-template-columns:260px minmax(0,1fr);gap:0}
.pyd-flush .pyd-layout3{grid-template-columns:260px minmax(0,1fr) 230px;gap:0}
.pyd-flush .pyd-layout2>.wtree,.pyd-flush .pyd-layout3>.wtree{position:sticky;top:var(--pydtop,111px);height:calc(100vh - var(--pydtop,111px));max-height:none;align-self:start;border:0;border-inline-end:1px solid var(--line);border-radius:0;padding:8px 0 30px;background:var(--surface);overflow:auto}
.pyd-flush .pyd-main{padding:28px clamp(18px,4vw,48px) 48px;margin-inline:auto;width:100%}
.pyd-flush .pyd-side{top:calc(var(--pydtop,111px) + 12px);max-height:calc(100vh - var(--pydtop,111px) - 24px);padding:28px 16px 20px;border-inline-start:1px solid var(--line)}
@media (max-width:1200px){.pyd-flush .pyd-layout3{grid-template-columns:240px minmax(0,1fr)}}
@media (max-width:900px){.pyd-flush .pyd-layout2,.pyd-flush .pyd-layout3{grid-template-columns:1fr}.pyd-flush .pyd-layout2>.wtree,.pyd-flush .pyd-layout3>.wtree{position:static;height:auto;max-height:260px;border-inline-end:0;border-bottom:1px solid var(--line)}}

/* ===== v14: کامنت هر بخش، دیوار اشتراک، تماس ===== */
.cmt-sec-btn{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);border-radius:999px;padding:4px 10px;font:inherit;font-size:12px;font-weight:600;cursor:pointer;margin-inline-start:8px;transition:.2s}
.cmt-sec-btn:hover{border-color:var(--accent);color:var(--accent)}
.cmt-cnt:empty{display:none}.cmt-cnt{font-family:var(--f-body)}
.tr-sec small + .cmt-sec-btn{margin-inline-start:8px}
.cmt-panel{position:fixed;top:0;bottom:0;inset-inline-start:0;width:min(420px,100vw);background:var(--paper);border-inline-end:1px solid var(--line);box-shadow:0 0 40px rgba(0,0,0,.35);z-index:300;display:flex;flex-direction:column;transform:translateX(105%);transition:transform .28s ease}
[dir=rtl] .cmt-panel{transform:translateX(105%)}
.cmt-panel.open{transform:none!important}
.cmt-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line)}
.cmt-close{background:none;border:0;color:var(--ink-2);font-size:18px;cursor:pointer}
.cmt-list{flex:1;overflow-y:auto;padding:12px 16px;overscroll-behavior:contain}
.cmt-empty,.cmt-loading{color:var(--ink-3);text-align:center;padding:40px 10px}
.cmt-item,.reply-item{display:flex;gap:10px;padding:12px 0;border-bottom:1px dashed var(--line)}
.reply-item{border:0;padding:8px 0 0}
.replies-area{margin-top:6px;padding-inline-start:10px;border-inline-start:2px solid var(--accent-soft)}
.cmt-av{flex:none;width:34px;height:34px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:800;overflow:hidden}
.cmt-av.sm{width:26px;height:26px;font-size:12px}.cmt-av img{width:100%;height:100%;object-fit:cover}
.cmt-body{flex:1;min-width:0}
.cmt-meta{display:flex;gap:8px;align-items:baseline;font-size:13px}
.cmt-text{margin-top:4px;line-height:1.9;white-space:pre-wrap;word-break:break-word}
.cmt-replies-btn,.cmt-reply-btn{font-size:12.5px;margin-top:4px;margin-inline-end:10px}
.cmt-form,.reply-form{display:flex;flex-direction:column;gap:8px;padding:12px 16px;border-top:1px solid var(--line)}
.reply-form{padding:8px 0;border:0}
.cmt-form textarea,.reply-form textarea,.ct-form textarea,.ct-form input{width:100%;font:inherit;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--sunk);color:var(--ink);resize:vertical}
.cmt-form textarea:focus,.reply-form textarea:focus,.ct-form textarea:focus,.ct-form input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.cmt-form .btn{align-self:flex-start}
.cmt-login{padding:16px;border-top:1px solid var(--line);text-align:center}
.lesson-paywall{margin:30px 0;padding:34px 22px;border-radius:18px;text-align:center;border:1px solid var(--accent);background:radial-gradient(circle at 50% 0,var(--accent-soft),transparent 70%);display:flex;flex-direction:column;align-items:center;gap:10px;position:relative}
.lesson-paywall::before{content:"";position:absolute;inset:-120px 0 100%;background:linear-gradient(transparent,var(--paper));pointer-events:none}
.lesson-paywall h3{margin:0;font-size:22px}.lesson-paywall p{margin:0;color:var(--ink-2);max-width:460px}
.lpw-lock{font-size:30px}
.fb-type{display:inline-flex;cursor:pointer}.fb-type input{display:none}
.fb-type span{padding:6px 12px;border-radius:999px;border:1px solid var(--line);font-size:13px}
.fb-type input:checked+span{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.ct-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:20px;margin:24px 0 60px}
.ct-form{display:flex;flex-direction:column;gap:12px;padding:20px;border-radius:16px}
.ct-types{display:flex;flex-wrap:wrap;gap:6px}
.ct-side{display:flex;flex-direction:column;gap:12px}
.ct-card{display:flex;flex-direction:column;gap:6px;padding:16px;border-radius:14px;border:1px solid var(--line);background:var(--surface);line-height:1.9}
.ct-card a{color:var(--accent);font-weight:700}
.co-safe{padding:10px 12px;border-radius:10px;background:var(--accent-soft);line-height:1.9}
@media (max-width:760px){.ct-grid{grid-template-columns:1fr}}
/* سربرگ: جست‌وجو در صفحه‌های متوسط فقط آیکن؛ منوی همبرگری در موبایل */
.menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--ink);border-radius:9px;width:40px;height:38px;place-items:center;cursor:pointer;flex:none}
@media (max-width:1560px){.search{width:auto;margin-inline-start:auto}.search input,.search .kbd{display:none}.search{cursor:pointer}}
@media (max-width:1420px){.nav a{padding:7px 7px;font-size:13px}.brand small{display:none}}
@media (max-width:1100px){
  .menu-btn{display:grid}
  .nav{display:none}
  body.menu-open .nav{display:flex!important;position:fixed;top:64px;inset-inline:10px;flex-direction:column;gap:2px;padding:10px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 50px rgba(0,0,0,.45);z-index:250;max-width:420px;margin-inline-start:auto}
  body.menu-open .nav a{font-size:16px;padding:12px 14px}
}
@media (max-width:820px){.search{display:none}}
.nav .m-only{display:none}
@media (max-width:1100px){body.menu-open .nav .m-only:not([hidden]){display:block;color:var(--accent);font-weight:700;border-top:1px solid var(--line);margin-top:4px}}
.manual-pay{border:1px dashed var(--line);border-radius:12px;padding:10px 12px;display:block}
.manual-pay summary{cursor:pointer;font-size:13.5px;color:var(--ink-2)}
.manual-pay[open]{display:flex;flex-direction:column;gap:8px}
.manual-pay p{margin:6px 0 0}
.mp-card{font-size:20px;font-weight:800;letter-spacing:1px;text-align:center;padding:10px;border-radius:10px;background:var(--sunk);cursor:pointer}
.manual-pay input{width:100%;font:inherit;padding:9px 11px;border-radius:10px;border:1px solid var(--line);background:var(--sunk);color:var(--ink)}