:root{
  --ink:#0A0A0A; --ink-2:#161616; --ink-3:#1f1f1f; --ink-line:#2a2a2a;
  --paper:#ffffff; --paper-2:#f5f5f3; --line:#e2e2de; --line-d:#d9d9d6; --muted:#5d5d5a; --muted-2:#8a8a86;
  --red:#E10600; --red-ink:#b30500; --red-tint:#fdeceb; --red-tint-2:#fff6f5;
  --sans:'Sora',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,monospace;
  --w:1180px; --pad:24px; --r:18px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper-2);line-height:1.5;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;cursor:pointer}
.mono{font-family:var(--mono)}
.wrap{max-width:var(--w);margin:0 auto;padding:0 var(--pad)}

/* topo */
.top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px dashed var(--line-d)}
.top .wrap{display:flex;align-items:center;gap:22px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:15px;letter-spacing:-.02em}
.brand img{width:30px;height:30px;border-radius:50%;object-fit:cover;box-shadow:0 0 0 2px #fff,0 0 0 3.5px var(--red)}
.brand span em{font-style:normal;color:var(--red)}
.nav{display:flex;gap:4px}
.nav a{text-decoration:none;font-size:14px;font-weight:500;color:var(--muted);padding:8px 12px;border-radius:999px;transition:background .2s,color .2s}
.nav a:hover{background:rgba(0,0,0,.05);color:var(--ink)}
.nav a.on{color:var(--ink);background:rgba(0,0,0,.06)}
.me{margin-left:auto;display:flex;align-items:center;gap:10px}
.me .ini{width:34px;height:34px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700}
.me form{margin:0}
.ghost{border:1px solid var(--line-d);background:#fff;border-radius:999px;padding:7px 14px;font-size:13.5px;font-weight:600;transition:border-color .2s,transform .2s}
.ghost:hover{border-color:var(--ink)}.ghost:active{transform:scale(.97)}

/* botões */
.pill{display:inline-flex;align-items:center;gap:10px;background:var(--ink);color:#fff;border:0;border-radius:999px;padding:12px 20px;font-size:14.5px;font-weight:600;text-decoration:none;transition:transform .2s,background .2s}
.pill:hover{transform:scale(1.025);background:#000}.pill:active{transform:scale(.98)}
.pill.red{background:var(--red)}.pill.red:hover{background:#c40500}
.pill.light{background:#fff;color:var(--ink)}
.pill:focus-visible,.ghost:focus-visible,.act:focus-visible,.card:focus-visible,.ls a:focus-visible{outline:2px solid var(--red);outline-offset:3px}

/* início: banner */
.hero{position:relative;overflow:hidden;background:var(--ink);color:#fff;border-radius:22px;padding:34px 34px 30px;margin:26px 0 8px}
.hero::after{content:"";position:absolute;width:620px;height:620px;right:-260px;bottom:-330px;border-radius:50%;background:radial-gradient(rgba(225,6,0,.3),transparent 66%);pointer-events:none}
.hero .tag{font-family:var(--mono);font-size:12px;color:#ff8b85;background:rgba(225,6,0,.16);padding:3px 9px;border-radius:6px;display:inline-block;margin-bottom:14px}
.hero h1{margin:0 0 10px;font-size:clamp(28px,3.6vw,44px);line-height:1.04;letter-spacing:-.045em;font-weight:800}
.hero h1 em{font-style:normal;color:var(--red)}
.hero p{margin:0 0 20px;color:#bdbdb9;font-size:15px;max-width:52ch}
.prog{position:relative;z-index:1;background:#1b1b1b;border-radius:16px;padding:18px 20px}
.prog small{display:block;font-size:12.5px;color:#a3a39f;margin-bottom:6px}
.prog strong{font-size:30px;font-weight:800;letter-spacing:-.04em}
.bar{height:6px;border-radius:4px;background:#2e2e2e;overflow:hidden;margin:12px 0 8px}
.bar i{display:block;height:100%;background:var(--red);border-radius:4px}
.prog .n{font-family:var(--mono);font-size:12px;color:#9a9a96}

/* fileiras de cards */
.row{margin:30px 0 6px}
.row-h{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.row-h h2{margin:0;font-size:18px;letter-spacing:-.02em}
.row-h .c{font-family:var(--mono);font-size:12px;color:var(--muted-2);white-space:nowrap}
.row-h .ar{margin-left:auto;display:flex;gap:6px}
.row-h .ar button{width:36px;height:36px;border-radius:10px;border:1px solid var(--line-d);background:#fff;display:grid;place-items:center;transition:border-color .2s}
.row-h .ar button:hover{border-color:var(--ink)}
.track{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:10px;scrollbar-width:none}
.track::-webkit-scrollbar{display:none}
.card{flex:none;width:236px;scroll-snap-align:start;text-decoration:none;color:#fff;border-radius:16px;overflow:hidden;position:relative;aspect-ratio:4/5;background:var(--ink);display:flex;flex-direction:column;justify-content:space-between;padding:18px;box-shadow:0 14px 34px -18px rgba(0,0,0,.5);transition:transform .35s cubic-bezier(.2,.7,.2,1)}
.card::after{content:"";position:absolute;width:300px;height:300px;right:-150px;bottom:-160px;border-radius:50%;background:radial-gradient(rgba(225,6,0,.28),transparent 68%);pointer-events:none}
.card:hover{transform:translateY(-4px)}
.card .num{font-size:64px;font-weight:800;line-height:.9;letter-spacing:-.06em;color:#1f1f1f;-webkit-text-stroke:1px #3a3a3a}
.card .k{font-family:var(--mono);font-size:11px;color:#a3a39f;letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.card h3{margin:0;font-size:18px;line-height:1.15;letter-spacing:-.03em;font-weight:800;position:relative;z-index:1}
.card .meta{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;margin-top:12px;font-size:12px;color:#a3a39f}
.done-b{display:inline-flex;align-items:center;gap:6px;color:#fff;background:var(--red);border-radius:999px;padding:2px 9px;font-size:11.5px;font-weight:600}
.card.lock{color:#fff}
.card.lock .lockv{position:absolute;inset:0;z-index:2;background:rgba(10,10,10,.62);backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;padding:18px}
.card.lock .lockv svg{width:26px;height:26px;color:#fff}
.card.lock .lockv span{font-size:13px;color:#e4e4e0}
.card.lock form{margin:0}
.file-card{flex:none;width:300px;scroll-snap-align:start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;display:flex;gap:14px;align-items:center;text-decoration:none}
.file-card .ic{width:44px;height:44px;border-radius:12px;background:var(--red-tint);color:var(--red-ink);display:grid;place-items:center;flex:none}
.file-card b{display:block;font-size:14.5px;line-height:1.25}
.file-card small{font-family:var(--mono);font-size:11.5px;color:var(--muted-2)}
.file-card.lock{opacity:.55}

/* aula: vídeo */
.stage{background:var(--ink);padding:22px 0 26px}
.player{position:relative;aspect-ratio:16/9;max-width:1100px;margin:0 auto;border-radius:16px;overflow:hidden;background:#000;box-shadow:0 30px 70px -30px rgba(0,0,0,.8)}
.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.soon{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:#d8d8d4;text-align:center;padding:20px;background:radial-gradient(circle at 70% 80%,rgba(225,6,0,.22),transparent 55%),#111}
.soon .play{width:72px;height:72px;border-radius:50%;background:var(--red);display:grid;place-items:center}
.soon .play svg{width:28px;height:28px;color:#fff;margin-left:4px}
.soon p{margin:0;font-size:15px}

/* aula: corpo */
.lesson{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px;padding:26px var(--pad) 80px;align-items:start}
.crumb{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--muted-2);margin-bottom:10px}
.crumb a{text-decoration:none}.crumb a:hover{color:var(--ink)}
.lesson h1{margin:0 0 6px;font-size:clamp(24px,2.6vw,32px);line-height:1.12;letter-spacing:-.04em;font-weight:800}
.mod{font-family:var(--mono);font-size:12px;color:var(--red-ink);background:var(--red-tint);display:inline-block;padding:2px 9px;border-radius:6px}
.desc{margin:18px 0;padding:18px 0;border-top:1px dashed var(--line-d);border-bottom:1px dashed var(--line-d);font-size:15px;line-height:1.7;color:#2f2f2d}
.desc p{margin:0 0 10px}.desc p:last-child{margin:0}
.desc a{color:var(--red-ink);word-break:break-all}
.mats{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;margin-bottom:18px}
.mats h3{margin:0 0 10px;font-size:15px}
.mats a,.mats .lk{display:flex;align-items:center;gap:12px;padding:10px 0;border-top:1px solid #efefec;text-decoration:none;font-size:14.5px}
.mats a:first-of-type{border-top:0}
.mats .ic{width:34px;height:34px;border-radius:10px;background:var(--red-tint);color:var(--red-ink);display:grid;place-items:center;flex:none}
.mats .go{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--muted-2)}
.mats .lk{color:var(--muted-2)}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:22px}
.actions form{margin:0}
.act{display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 16px;border-radius:999px;border:1px solid var(--line-d);background:#fff;font-size:14px;font-weight:600;text-decoration:none;transition:border-color .2s,background .2s,transform .2s}
.act:hover{border-color:var(--ink)}.act:active{transform:scale(.97)}
.act.ic{width:42px;padding:0;justify-content:center}
.act svg{width:17px;height:17px}
.act.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.act.done{background:var(--red);color:#fff;border-color:var(--red)}
.actions .sp{flex:1}
.actions .nav2{display:flex;gap:8px;margin-left:auto}

/* comentários e dúvidas (abas sem JS) */
.talk{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.talk input[type=radio]{position:absolute;opacity:0;pointer-events:none}
.tabs{display:flex;gap:6px;padding:0 18px;border-bottom:1px solid #efefec}
.tabs label{padding:15px 4px;margin-right:16px;font-size:14.5px;font-weight:600;color:var(--muted-2);cursor:pointer;border-bottom:2px solid transparent}
#t-c:checked~.tabs label[for=t-c],#t-d:checked~.tabs label[for=t-d]{color:var(--ink);border-color:var(--red)}
.pane{display:none}
#t-c:checked~.p-c,#t-d:checked~.p-d{display:block}
.send{display:flex;gap:12px;padding:16px 18px;background:#fafaf8;border-bottom:1px solid #efefec}
.send textarea{flex:1;min-height:46px;resize:vertical;border:1px solid var(--line-d);border-radius:12px;padding:12px 14px;font:inherit;font-size:14.5px;background:#fff}
.send textarea:focus{outline:2px solid var(--red);outline-offset:1px;border-color:transparent}
.send button{align-self:flex-end;width:46px;height:46px;border-radius:12px;border:0;background:var(--ink);color:#fff;display:grid;place-items:center}
.send button svg{width:18px;height:18px}
.cm{display:flex;gap:12px;padding:16px 18px;border-bottom:1px solid #f1f1ee}
.cm:last-child{border-bottom:0}
.cm .av{width:38px;height:38px;border-radius:50%;background:#ececea;display:grid;place-items:center;font-size:13px;font-weight:700;color:#55554f;flex:none}
.cm .av.adm{background:var(--ink);color:#fff;box-shadow:0 0 0 2px #fff,0 0 0 3.5px var(--red)}
.cm b{font-size:14px}
.cm .badge{font-size:11px;font-weight:600;background:var(--red);color:#fff;border-radius:6px;padding:1px 7px;margin-left:6px}
.cm time{display:block;font-size:12px;color:var(--muted-2);margin-top:1px}
.cm p{margin:8px 0 0;font-size:14.5px;line-height:1.6;white-space:pre-wrap;word-break:break-word}
.empty{padding:26px 18px;text-align:center;color:var(--muted-2);font-size:14px}

/* lateral: progresso e lista */
.side{position:sticky;top:84px;display:flex;flex-direction:column;gap:12px}
.box{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px}
.pr{display:flex;align-items:center;gap:14px}
.ring{width:52px;height:52px;flex:none}
.ring circle{fill:none;stroke-width:5}
.ring .bg{stroke:#ececea}.ring .fg{stroke:var(--red);stroke-linecap:round;transform:rotate(-90deg);transform-origin:50% 50%}
.pr b{display:block;font-size:15px}
.pr small{font-size:12.5px;color:var(--muted-2)}
.mh{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin:2px 0 8px}
.mh b{font-size:14.5px}
.mh small{font-family:var(--mono);font-size:11.5px;color:var(--muted-2);white-space:nowrap}
.ls{list-style:none;margin:0 0 6px;padding:0;position:relative}
.ls::before{content:"";position:absolute;left:8px;top:10px;bottom:10px;width:1px;background:#e6e6e3}
.ls li a,.ls li span.x{display:flex;gap:12px;align-items:flex-start;padding:8px 6px 8px 0;text-decoration:none;font-size:13.5px;line-height:1.35;color:#3d3d3a;border-radius:10px}
.ls li a:hover{color:var(--ink)}
.ls .dot{position:relative;z-index:1;flex:none;width:17px;height:17px;margin-top:1px;border-radius:50%;border:1.5px solid #cfcfcb;background:#fff;display:grid;place-items:center}
.ls .dot svg{width:10px;height:10px;color:#fff}
.ls li.ok .dot{background:var(--red);border-color:var(--red)}
.ls li.cur a{color:var(--red-ink);font-weight:600}
.ls li.cur .dot{border-color:var(--red);box-shadow:inset 0 0 0 3.5px #fff;background:var(--red)}
.ls li.lk span.x{color:#a9a9a5}
.ls li.lk .dot{background:#f2f2ef}
.ls li.lk .dot svg{color:#a9a9a5}
.ls .t{font-family:var(--mono);font-size:11px;color:var(--muted-2);margin-left:auto;padding-left:8px;white-space:nowrap}
.up{background:var(--ink);color:#fff;border-color:var(--ink);position:relative;overflow:hidden}
.up::after{content:"";position:absolute;width:260px;height:260px;right:-130px;bottom:-150px;border-radius:50%;background:radial-gradient(rgba(225,6,0,.3),transparent 68%)}
.up b{display:block;font-size:15px;margin-bottom:4px;position:relative;z-index:1}
.up p{margin:0 0 12px;font-size:13px;color:#bdbdb9;position:relative;z-index:1}
.up form{margin:0;position:relative;z-index:1}

/* páginas simples (entrar, cadastrar, avisos) */
.solo{max-width:440px;margin:56px auto;padding:0 var(--pad)}
.solo .boxw{background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px}
.solo h1{margin:0 0 6px;font-size:26px;letter-spacing:-.04em}
.solo p{color:var(--muted);font-size:14.5px;margin:0 0 18px}
.solo label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.solo input{width:100%;height:46px;border:1px solid var(--line-d);border-radius:12px;padding:0 14px;font:inherit;font-size:15px;margin-bottom:14px;background:#fff}
.solo input:focus{outline:2px solid var(--red);outline-offset:1px;border-color:transparent}
.solo .pill{width:100%;justify-content:center}
.solo .alt{margin-top:22px;padding-top:20px;border-top:1px dashed var(--line-d)}
.solo .alt h2{font-size:15px;margin:0 0 4px}
.foot{text-align:center;font-family:var(--mono);font-size:12px;color:var(--muted-2);padding:26px 0 40px}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding:26px 22px}
  .lesson{grid-template-columns:1fr}
  .side{position:static}
  .stage{padding:0}
  .stage .wrap{padding:0}
  .row-h h2{font-size:16px}
  .player{border-radius:0}
  .card{width:200px}
  .nav{display:none}
}
@media (max-width:420px){
  :root{--pad:18px}
  .act:not(.keep) span.l{display:none}
  .act{padding:0 14px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* vitrine de capas (uma por parte do curso) */
.covers{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.cover{position:relative;display:block;aspect-ratio:4/5;border-radius:18px;overflow:hidden;background:var(--ink);color:#fff;text-decoration:none;box-shadow:0 18px 40px -20px rgba(0,0,0,.55);transition:transform .35s cubic-bezier(.2,.7,.2,1)}
.cover:hover{transform:translateY(-5px)}
.cover .cv-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cv-fb{position:absolute;inset:0;padding:22px 22px 56px;display:flex;flex-direction:column;justify-content:flex-end;background:radial-gradient(circle at 80% 90%,rgba(225,6,0,.35),transparent 60%),var(--ink)}
.cv-fb .k{font-family:var(--mono);font-size:11px;color:#a3a39f;letter-spacing:.06em;text-transform:uppercase;margin-bottom:8px}
.cv-fb h3{margin:0;font-size:24px;line-height:1.08;letter-spacing:-.04em;font-weight:800}
.cv-meta{position:absolute;left:0;right:0;bottom:0;z-index:1;display:flex;justify-content:space-between;align-items:center;padding:12px 16px;font-size:12.5px;color:#e4e4e0;background:linear-gradient(transparent,rgba(10,10,10,.85))}
.cover.lock .lockv{position:absolute;inset:0;z-index:2;background:rgba(10,10,10,.6);backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;padding:18px}
.cover.lock .lockv svg{width:26px;height:26px}
.cover.lock .lockv span{font-size:13px;color:#e4e4e0}
.cover.lock form{margin:0}
@media (max-width:520px){.covers{grid-template-columns:1fr 1fr;gap:12px}.cv-fb h3{font-size:18px}}