/* Layout: the practice site's world (charcoal, film grain, heavy uppercase grotesque, one lime signal)
   carried into the course page and the student cabinet. The lesson player borrows the course slides'
   cream/orange look, because that is what the real videos are. One deliberate dark world. */
:root{
  color-scheme:dark;
  --bg:#151614; --surface:#1c1e1a; --raise:#23261f; --ink:#ededea; --muted:#a3a69d; --line:#31342d;
  --lime:#aee36d; --lime-ink:#151614; --lime-wash:#222a19; --olive:#6d8945; --band-muted:#3a4527;
  --bad:#ee8f7f; --bad-wash:#2f1e1b; --warn:#e6c66e;
  --slide-bg:#F3EFE6; --slide-ink:#14181F; --slide-accent:#E0612A; --slide-muted:#4D5560;
  --f-display:"Onest","Arial","Helvetica Neue",sans-serif;
  --f-body:"Golos Text","Arial","Helvetica Neue",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --s--1:.8125rem; --s0:1.0625rem; --s1:1.2rem; --s2:1.5rem;
  --s3:clamp(1.55rem,1.1rem + 1.8vw,2.4rem); --s4:clamp(2rem,1.1rem + 2.8vw,3.2rem);
  --maxw:1120px;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg);scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:var(--s0);line-height:1.6;-webkit-font-smoothing:antialiased;padding-bottom:env(safe-area-inset-bottom,0px)}
body::after{content:"";position:fixed;inset:0;z-index:50;pointer-events:none;opacity:.08;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>")}
h1,h2,h3{margin:0;text-wrap:balance}
h1,h2{font-family:var(--f-display);font-weight:800;text-transform:uppercase;letter-spacing:-.01em;line-height:1.04}
h1{font-size:var(--s4)}
h2{font-size:var(--s3)}
h3{font-family:var(--f-display);font-size:var(--s1);font-weight:700;line-height:1.3}
p{margin:0}
a{color:inherit}
button,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.wrap{max-width:calc(var(--maxw) + 32px);margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.narrow{max-width:calc(800px + 32px)}
.eyebrow{font-family:var(--f-mono);font-size:var(--s--1);font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--lime)}
.muted{color:var(--muted)}
.small{font-size:.92rem}
.mono{font-family:var(--f-mono)}
.hl{color:var(--lime)}
.nw{white-space:nowrap}
.stack{display:flex;flex-direction:column;gap:14px;min-width:0}
.tight{gap:6px}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px}
.between{justify-content:space-between}

/* Buttons: pills with an arrow, as on the practice site */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:48px;padding:0 24px;border-radius:999px;border:1.5px solid var(--lime);background:var(--lime);color:var(--lime-ink);font-family:var(--f-display);font-size:1rem;font-weight:700;text-decoration:none;cursor:pointer;transition:transform .15s ease,border-color .15s ease,background-color .15s ease;white-space:nowrap}
.btn::after{content:"→";font-family:var(--f-body);font-weight:500}
.btn.no-arrow::after{content:none}
.btn:hover:not(:disabled){transform:translateY(-1px)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--lime);border-color:var(--olive)}
.btn.ghost:hover:not(:disabled){border-color:var(--lime)}
.btn.sm{min-height:40px;padding:0 18px;font-size:.92rem}
.btn.lg{min-height:56px;padding:0 30px;font-size:1.05rem}
.btn.block{width:100%}
.link{border:0;background:none;padding:0;color:var(--lime);cursor:pointer;text-decoration:underline;text-underline-offset:3px;font-size:inherit}
.link.quiet{color:var(--muted)}

/* Top bar */
.topbar{border-bottom:1px solid var(--line);position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:21;background:var(--bg)}
.topbar-in{display:flex;align-items:center;gap:20px;min-height:64px;padding-block:10px}
.brand{margin-right:auto;display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;border:0;background:none;padding:0;cursor:pointer;font-family:var(--f-display);font-weight:800;font-size:1.05rem;text-transform:uppercase;color:var(--ink);text-align:left}
.brand-tag{font-family:var(--f-mono);font-size:var(--s--1);font-weight:400;text-transform:none;color:var(--muted)}
.nav{display:flex;gap:22px}
.nav a{text-decoration:none;color:var(--muted);font-size:.95rem}
.nav a:hover{color:var(--ink)}
.who{font-size:.92rem;color:var(--muted)}

/* Hero */
.hero{padding-block:clamp(36px,6vw,80px) clamp(48px,7vw,92px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:center}
.hero-copy{display:flex;flex-direction:column;gap:22px;min-width:0}
.lead{font-size:var(--s1);color:var(--muted);max-width:40ch}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.facts{list-style:none;margin:4px 0 0;padding:18px 0 0;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:8px 28px;font-size:.95rem;color:var(--muted)}
.facts b{font-family:var(--f-display);font-weight:800;font-size:1.3rem;color:var(--lime);font-variant-numeric:tabular-nums}
.hero-photo{margin:0;min-width:0;display:flex;flex-direction:column;gap:10px}
.hero-photo img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;border-radius:6px}
.hero-photo figcaption{font-family:var(--f-mono);font-size:.78rem;color:var(--muted)}

/* Sections */
.section{padding-block:clamp(52px,8vw,100px)}
.band{background:var(--surface);border-block:1px solid var(--line)}
.section-head{display:flex;flex-direction:column;gap:14px;max-width:46rem;margin-bottom:clamp(26px,4vw,44px)}
.section-sub{font-size:var(--s1);color:var(--muted);max-width:44ch}

/* System chain */
.chain{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:2px solid var(--ink)}
.chain li{display:flex;flex-direction:column;gap:10px;padding:20px 18px 24px;border-right:1px solid var(--line);min-width:0}
.chain li:first-child{padding-left:0}
.chain li:last-child{border-right:0;padding-right:0}
.chain .code{font-family:var(--f-mono);font-size:.8rem;font-weight:500;letter-spacing:.06em;color:var(--lime)}
.chain p{font-size:.98rem;color:var(--muted)}
.chain b{display:block;font-family:var(--f-display);font-weight:800;font-size:var(--s1);text-transform:uppercase;color:var(--ink)}

/* Program */
.mods{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.mod{display:grid;grid-template-columns:minmax(0,14rem) minmax(0,1fr);gap:12px 36px;padding-block:28px;border-bottom:1px solid var(--line);align-items:start}
.mod-id{display:flex;flex-direction:column;gap:6px;min-width:0}
.mod-n{font-family:var(--f-mono);font-size:.8rem;letter-spacing:.06em;color:var(--muted)}
.mod-code{font-family:var(--f-display);font-weight:800;font-size:var(--s3);line-height:1;color:var(--lime);text-transform:uppercase}
.tag{align-self:flex-start;padding:3px 10px;border:1px solid var(--olive);border-radius:999px;font-family:var(--f-mono);font-size:.72rem;color:var(--lime);white-space:nowrap}
.mod-body{display:flex;flex-direction:column;gap:12px;min-width:0}
.mod-q{font-style:italic;color:var(--muted)}
.topics{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.topics li{display:grid;grid-template-columns:18px minmax(0,1fr);gap:8px}
.topics li::before{content:"—";color:var(--olive)}
.result{display:flex;flex-direction:column;gap:4px;padding:12px 14px;border-left:2px solid var(--lime);background:var(--lime-wash);border-radius:0 6px 6px 0}
.result span{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--lime)}
.mod-buy{display:flex;flex-direction:column;gap:10px;align-items:flex-start;min-width:0}
.price{font-family:var(--f-display);font-weight:800;font-size:1.3rem;font-variant-numeric:tabular-nums;white-space:nowrap}
.owned{font-family:var(--f-mono);font-size:.8rem;color:var(--lime)}

/* Format */
.fmt{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.card{display:flex;flex-direction:column;gap:10px;min-width:0;padding:22px 22px 24px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.card p{color:var(--muted)}

/* Pricing */
.pricing{display:flex;flex-direction:column;gap:16px}
.lcount{font-family:var(--f-mono);font-size:.8rem;color:var(--muted)}
.outs{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.outs li{display:grid;grid-template-columns:20px minmax(0,1fr);gap:8px}
.outs li::before{content:"✓";color:var(--lime);font-family:var(--f-mono)}
.mods-cta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px 24px;margin-top:28px;padding:22px 24px;border:1px solid var(--olive);border-radius:14px;background:var(--lime-wash)}
.mods-cta b{font-family:var(--f-display);font-size:var(--s1)}
.alt{border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}
.alt summary{list-style:none;cursor:pointer;padding:16px 18px;display:flex;justify-content:space-between;gap:12px;font-family:var(--f-display);font-weight:700}
.alt summary::-webkit-details-marker{display:none}
.alt summary::after{content:"+";color:var(--lime);font-family:var(--f-mono)}
.alt[open] summary::after{content:"–"}
.alt .plist{border:0;border-top:1px solid var(--line);border-radius:0}
.full{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:24px 48px;align-items:end;padding:clamp(24px,4vw,40px);border-radius:14px;background:var(--lime);color:var(--lime-ink)}
.full .eyebrow{color:var(--band-muted)}
.full h3{font-size:var(--s3);font-weight:800;text-transform:uppercase;line-height:1.05}
.full ul{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:4px}
.full .price{font-size:clamp(2rem,1.4rem + 2vw,2.8rem)}
.full .save{font-family:var(--f-mono);font-size:.85rem;color:var(--band-muted)}
.full .btn{background:var(--lime-ink);color:var(--lime);border-color:var(--lime-ink)}
.full .owned{color:var(--lime-ink)}
.plist{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}
.prow{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:12px;align-items:center;padding:14px 18px;border-bottom:1px solid var(--line)}
.prow:last-child{border-bottom:0}
.prow b{font-family:var(--f-display);font-weight:700}
.prow .price{font-size:1.05rem}
.pnote{padding:14px 18px;font-size:.92rem;color:var(--muted);background:var(--raise)}

/* Author */
.about{display:grid;grid-template-columns:minmax(0,16rem) minmax(0,1fr);gap:clamp(26px,5vw,60px);align-items:start}
.portrait{display:block;width:100%;max-width:16rem;height:auto;aspect-ratio:4/5;object-fit:cover;border-radius:6px;border:1px solid var(--line)}
.cos{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}
.cos li{display:grid;grid-template-columns:8rem minmax(0,1fr);gap:16px;padding-block:14px;border-bottom:1px solid var(--line)}
.cos b{font-family:var(--f-display);font-weight:800;text-transform:uppercase}
.quote{font-family:var(--f-display);font-weight:700;font-size:var(--s2);line-height:1.25;max-width:30ch}

/* FAQ */
.faq{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:18px 0;display:flex;justify-content:space-between;gap:16px;font-family:var(--f-display);font-weight:700;font-size:var(--s1)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--lime);font-family:var(--f-mono)}
.faq details[open] summary::after{content:"–"}
.faq p{padding-bottom:18px;color:var(--muted);max-width:62ch}

/* Footer */
.foot{border-top:1px solid var(--line);padding-block:26px;font-family:var(--f-mono);font-size:.8rem;color:var(--muted)}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.foot .link{color:var(--muted);font-family:var(--f-mono);font-size:.8rem}
.ph{color:var(--warn)}

/* Forms, panels */
.page{padding-block:28px 56px;display:flex;flex-direction:column;gap:22px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:clamp(20px,3vw,28px)}
.two{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:18px;align-items:start}
.auth{max-width:460px;width:100%;margin-inline:auto}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field label{font-size:.92rem;font-weight:500}
.inp{width:100%;min-height:48px;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink)}
.inp:focus{outline:2px solid var(--lime);outline-offset:-1px}
.inp[readonly]{color:var(--muted)}
.inp.code{font-family:var(--f-mono);font-size:1.4rem;letter-spacing:.4em;text-align:center}
.check{display:flex;gap:10px;align-items:flex-start;cursor:pointer;font-size:.95rem}
.check input{margin-top:5px;accent-color:var(--lime);width:16px;height:16px}
.err{color:var(--bad);font-size:.92rem}
.flash{padding:12px 16px;border-radius:10px;font-size:.95rem}
.flash.ok{background:var(--lime-wash);color:var(--lime);border:1px solid var(--olive)}
.flash.bad{background:var(--bad-wash);color:var(--bad)}
.flash.info{background:var(--raise);color:var(--ink);border:1px solid var(--line)}
.sum dl{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 16px;margin:0}
.sum dt{color:var(--muted)}
.sum dd{margin:0;text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.sum .total{padding-top:10px;border-top:1px solid var(--line);font-family:var(--f-display);font-weight:800;font-size:1.25rem;color:var(--ink)}
.center{text-align:center;align-items:center}
.mark{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;font-family:var(--f-display);font-weight:800;font-size:1.6rem}
.mark.ok{background:var(--lime);color:var(--lime-ink)}
.mark.bad{background:var(--bad-wash);color:var(--bad);border:1px solid var(--bad)}
.paybox{max-width:540px;width:100%;margin-inline:auto;border:1.5px dashed var(--olive);border-radius:14px;padding:28px;display:flex;flex-direction:column;gap:16px;background:var(--surface)}
.kv{display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 16px;margin:0}
.kv dt{color:var(--muted)}
.kv dd{margin:0;overflow-wrap:anywhere}

/* Mail (demo inbox) */
.inbox{display:grid;grid-template-columns:300px minmax(0,1fr);border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--surface);min-height:380px}
.mlist{border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0}
.mitem{border:0;background:none;text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);cursor:pointer;display:flex;flex-direction:column;gap:2px;min-width:0;color:var(--ink)}
.mitem:hover{background:var(--raise)}
.mitem[aria-current="true"]{background:var(--lime-wash)}
.mitem .msub{font-size:.95rem;overflow-wrap:anywhere}
.mitem.unread .msub{font-weight:600}
.mitem.unread .msub::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--lime);margin-right:7px;vertical-align:2px}
.mread{padding:22px;display:flex;flex-direction:column;gap:16px;min-width:0;background:var(--raise)}
.letter{max-width:520px;width:100%;border-radius:12px;overflow:hidden;background:var(--bg);border:1px solid var(--line)}
.letter-top{padding:18px 24px;border-bottom:1px solid var(--line);font-family:var(--f-display);font-weight:800;text-transform:uppercase}
.letter-body{padding:24px;display:flex;flex-direction:column;gap:14px}
.letter-code{font-family:var(--f-mono);font-size:2rem;letter-spacing:.3em;color:var(--lime)}
.letter-foot{padding:14px 24px;border-top:1px solid var(--line);font-family:var(--f-mono);font-size:.75rem;color:var(--muted)}

/* Cabinet */
.hello{display:flex;flex-direction:column;gap:6px}
.cont{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px 24px;align-items:center;padding:22px 24px;border-radius:14px;background:var(--lime);color:var(--lime-ink)}
.cont .eyebrow{color:var(--band-muted)}
.cont h3{font-size:var(--s2);font-weight:800;line-height:1.15}
.cont .btn{background:var(--lime-ink);color:var(--lime);border-color:var(--lime-ink)}
.cont .meta{font-size:.92rem;color:var(--band-muted)}
.bar{height:6px;background:var(--line);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--lime);border-radius:99px}
.mbars{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.mbar{display:flex;flex-direction:column;gap:6px;font-size:.85rem}
.mbar b{font-family:var(--f-mono);font-weight:500;color:var(--lime)}
.mbar.off b{color:var(--muted)}
.ugrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.ucard{display:flex;flex-direction:column;gap:10px;padding:20px;border:1px dashed var(--olive);border-radius:14px;min-width:0}
.ucard.full-up{border-style:solid;border-color:var(--lime);background:var(--lime-wash)}
.ucard .foot-row{margin-top:auto;padding-top:12px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between}
.done-badge{display:inline-flex;gap:8px;align-items:center;font-family:var(--f-mono);font-size:.8rem;color:var(--lime)}

/* Course page */
.cmod{border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden}
.cmod.locked{background:transparent;border-style:dashed}
.cmod-head{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 20px;align-items:flex-start;padding:18px 20px 12px}
.cmod-head .mcode{font-family:var(--f-display);font-weight:800;text-transform:uppercase;color:var(--lime);font-size:1.25rem}
.cmod.locked .mcode{color:var(--muted)}
.lessons{display:flex;flex-direction:column;padding:0 8px 10px}
.lrow{display:grid;grid-template-columns:24px 46px minmax(0,1fr) auto;gap:10px;align-items:center;padding:11px 12px;border-radius:10px;border:0;background:transparent;width:100%;text-align:left;cursor:pointer;color:inherit}
.lrow:hover{background:var(--raise)}
.lrow .num{font-family:var(--f-mono);font-size:.82rem;color:var(--muted)}
.lrow .st{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.75rem;font-family:var(--f-mono);border:1.5px solid var(--olive);color:var(--lime)}
.lrow.done .st{background:var(--lime);border-color:var(--lime);color:var(--lime-ink)}
.lrow.open .st{border-color:var(--lime)}
.lrow.locked{cursor:default;color:var(--muted)}
.lrow.locked:hover{background:transparent}
.lrow.locked .st{border-color:var(--line);color:var(--muted)}
.lmeta{font-family:var(--f-mono);font-size:.78rem;color:var(--muted);white-space:nowrap}
.lmeta.warn{color:var(--warn)}
@media (max-width:560px){.lrow{grid-template-columns:24px 38px minmax(0,1fr)}.lmeta{grid-column:3}}
.buybox{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px}

/* Lesson */
.crumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.92rem;color:var(--muted)}
.player{position:relative;width:100%;max-width:100%;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:var(--slide-bg);color:var(--slide-ink);container-type:inline-size}
.slide{position:absolute;inset:0;padding:6.6cqw 6.6cqw 8cqw;display:flex;flex-direction:column;gap:2cqw}
.s-eyebrow{font-family:var(--f-mono);font-size:1.6cqw;letter-spacing:.2cqw;text-transform:uppercase;color:var(--slide-accent)}
.s-title{font-family:var(--f-body);font-weight:600;font-size:4.2cqw;line-height:1.12;max-width:62%}
.s-foot{position:absolute;left:6.6cqw;bottom:3.4cqw;font-family:var(--f-mono);font-size:1.4cqw;color:var(--slide-muted)}
.s-foot b{color:var(--slide-accent);font-weight:500}
.s-avatar{position:absolute;right:6.6cqw;top:6.6cqw;width:20cqw;height:20cqw;border-radius:50%;border:.3cqw solid var(--slide-accent);overflow:hidden}
.s-avatar img{width:100%;height:100%;object-fit:cover;display:block}
.play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:76px;height:76px;border-radius:50%;border:0;background:var(--slide-ink);color:var(--slide-bg);display:grid;place-items:center;cursor:pointer;box-shadow:0 10px 30px -10px rgba(0,0,0,.5)}
.play svg{width:28px;height:28px}
.play.on{opacity:.35}
.player:hover .play.on{opacity:.85}
.ptrack{position:absolute;left:0;right:0;bottom:0;height:5px;background:rgba(20,24,31,.15)}
.ptrack i{display:block;height:100%;width:0;background:var(--slide-accent);transition:width .9s linear}
.ptime{position:absolute;right:14px;bottom:12px;font-family:var(--f-mono);font-size:12px;color:var(--slide-muted);font-variant-numeric:tabular-nums}
.task{padding:18px 20px;border-left:2px solid var(--lime);background:var(--lime-wash);border-radius:0 10px 10px 0;display:flex;flex-direction:column;gap:8px}
.task span{font-family:var(--f-mono);font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--lime)}
.quiz{display:flex;flex-direction:column;gap:14px}
.q{border:1px solid var(--line);border-radius:12px;padding:16px 16px 10px;background:var(--bg)}
.q fieldset{border:0;padding:0;margin:0;min-width:0}
.q legend{padding:0;margin-bottom:10px;font-weight:600}
.opt{display:flex;gap:12px;align-items:flex-start;padding:10px 12px;border-radius:8px;cursor:pointer}
.opt:hover{background:var(--raise)}
.opt input{margin-top:5px;accent-color:var(--lime);width:16px;height:16px;flex:none}
.opt.right{background:var(--lime-wash);color:var(--lime)}
.opt.wrong{background:var(--bad-wash);color:var(--bad)}
.lnav{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-top:18px;border-top:1px solid var(--line)}

/* Author admin */
.adm{display:grid;grid-template-columns:minmax(0,320px) minmax(0,1fr);gap:18px;align-items:start}
@media (max-width:900px){.adm{grid-template-columns:minmax(0,1fr)}}
.tree{display:flex;flex-direction:column;gap:14px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.tree-m{display:flex;flex-direction:column;gap:2px}
.tree-m>b{font-family:var(--f-mono);font-size:.8rem;letter-spacing:.06em;color:var(--lime);padding:4px 8px}
.tl{display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:8px;align-items:center;width:100%;text-align:left;border:0;background:none;padding:7px 8px;border-radius:8px;cursor:pointer;color:var(--ink);font-size:.9rem}
.tl:hover{background:var(--raise)}
.tl[aria-current="true"]{background:var(--lime-wash);outline:1px solid var(--olive)}
.tl .num{font-family:var(--f-mono);font-size:.78rem;color:var(--muted)}
.badge{font-family:var(--f-mono);font-size:.7rem;padding:2px 7px;border-radius:999px;white-space:nowrap;border:1px solid var(--line);color:var(--muted)}
.badge.ok{border-color:var(--olive);color:var(--lime)}
.badge.warn{border-color:var(--warn);color:var(--warn)}
.addl{border:1px dashed var(--line);background:none;color:var(--muted);border-radius:8px;padding:6px 8px;cursor:pointer;font-size:.85rem;text-align:left}
.addl:hover{border-color:var(--lime);color:var(--lime)}
textarea.inp{min-height:90px;resize:vertical;line-height:1.5}
.fgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.qprev{display:flex;flex-direction:column;gap:8px}
.qprev>li{border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:var(--bg);list-style:none}
.qprev ol li{padding:2px 0}
.qprev ol{margin:6px 0 0;padding-left:20px;color:var(--muted);font-size:.92rem}
.qprev .right{color:var(--lime)}
.drop{display:flex;flex-direction:column;gap:12px;padding:20px;border:1.5px dashed var(--olive);border-radius:14px;background:var(--surface)}
.drop.over{border-color:var(--lime);background:var(--lime-wash)}
.tw{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
.tw table{width:100%;border-collapse:collapse;font-size:.92rem}
.tw th{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);font-weight:500}
.tw td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tw tr:last-child td{border-bottom:0}
pre.code{margin:0;padding:12px 14px;border-radius:10px;background:var(--bg);border:1px solid var(--line);font-family:var(--f-mono);font-size:.8rem;overflow-x:auto;white-space:pre}


@media (max-width:980px){
  .chain{grid-template-columns:minmax(0,1fr)}
  .chain li,.chain li:first-child,.chain li:last-child{padding:16px 0;border-right:0;border-bottom:1px solid var(--line)}
  .mod{grid-template-columns:minmax(0,1fr)}
  .mod-id{flex-direction:row;flex-wrap:wrap;align-items:baseline;gap:8px 14px}
}
@media (max-width:860px){
  .hero-grid,.full,.two,.about{grid-template-columns:minmax(0,1fr)}
  .fmt{grid-template-columns:minmax(0,1fr)}
  .inbox{grid-template-columns:minmax(0,1fr)}
  .mlist{border-right:0;border-bottom:1px solid var(--line)}
  .portrait{max-width:12rem}
}
@media (max-width:640px){
  .nav{display:none}
  .who{display:none}
  .cont{grid-template-columns:minmax(0,1fr)}
  .cos li{grid-template-columns:minmax(0,1fr);gap:2px}
  .prow{grid-template-columns:minmax(0,1fr) auto}
  .prow .btn{grid-column:1/-1;justify-self:start}
  .play{width:56px;height:56px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn{transition:none}
  .btn:hover:not(:disabled){transform:none}
  .ptrack i{transition:none}
}

/* App-only */
.toast{position:fixed;left:50%;transform:translateX(-50%);top:calc(76px + env(safe-area-inset-top,0px));z-index:70;max-width:min(520px,calc(100vw - 32px));padding:12px 16px;border-radius:12px;background:var(--ink);color:var(--bg);font-size:.95rem;box-shadow:0 18px 40px -16px rgba(0,0,0,.8)}
.loading{padding:60px 0;text-align:center;color:var(--muted);font-family:var(--f-mono);font-size:.85rem}
.vframe{position:relative;width:100%;max-width:100%;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}
.vframe iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.copyrow{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.copyrow input{flex:1;min-width:0}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);overflow-x:auto}
.tab{border:0;background:none;padding:10px 14px;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;white-space:nowrap;font-weight:500}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--lime)}
select.inp{appearance:auto}
a.brand{text-decoration:none}
a.lrow{text-decoration:none}
.adm{display:grid;grid-template-columns:minmax(0,320px) minmax(0,1fr);gap:18px;align-items:start}
@media (max-width:900px){.adm{grid-template-columns:minmax(0,1fr)}}