:root{--bg:#141414;--bg-2:#1c1c1b;--bg-3:#262624;--fg:#f4f2ec;--muted:#a9a79c;--line:#ffffff1a;--brand:#f2d73a;--accent:#4b5320;--danger:#e5675c;--ok:#5fbf7a;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--fg);min-height:100dvh;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}a{color:inherit}img{max-width:100%;display:block}button,input,select,textarea{font:inherit;color:inherit}.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 16px}.muted{color:var(--muted)}.small{font-size:13px}.stack{gap:12px;display:grid}.row-flex{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.spacer{flex:1}.topnav{z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);background:linear-gradient(#000000d9,#0000008c);position:sticky;top:0}.topnav .wrap{align-items:center;gap:14px;height:56px;display:flex}.logo{letter-spacing:.02em;align-items:center;gap:8px;font-weight:800;text-decoration:none;display:flex}.logo img{width:auto;height:28px}.logo .dot{background:var(--brand);border-radius:50%;width:10px;height:10px}.topnav nav{gap:14px;font-size:14px;display:flex}.topnav nav a{color:var(--muted);text-decoration:none}.topnav nav a:hover{color:var(--fg)}.btn{background:var(--brand);color:#111;cursor:pointer;border:0;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:12px 18px;font-weight:700;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:default}.btn.secondary{background:var(--bg-3);color:var(--fg);border:1px solid var(--line)}.btn.danger{color:var(--danger);border:1px solid var(--danger);background:0 0}.btn.sm{border-radius:8px;padding:7px 12px;font-size:13px}.btn.block{width:100%}.field{gap:6px;font-size:14px;display:grid}.field input,.field select,.field textarea{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;width:100%;padding:11px 12px}.field textarea{resize:vertical;min-height:120px}.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand);outline-offset:0}.card{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:18px}.alert{background:var(--bg-3);border-left:4px solid var(--brand);border-radius:10px;padding:12px 14px;font-size:14px}.alert.error{border-color:var(--danger)}.alert.ok{border-color:var(--ok)}.auth{background:radial-gradient(1200px 600px at 50% -10%, color-mix(in srgb, var(--brand) 18%, transparent), transparent 60%), var(--bg);place-items:center;min-height:100dvh;padding:24px 16px;display:grid}.auth .card{width:100%;max-width:420px;padding:26px 22px}.auth h1{margin-bottom:6px;font-size:24px}.divider{color:var(--muted);align-items:center;gap:10px;margin:6px 0;font-size:12px;display:flex}.divider:before,.divider:after{content:"";background:var(--line);flex:1;height:1px}.hero{background-position:50%;background-size:cover;align-items:flex-end;min-height:52vh;padding:80px 0 34px;display:flex;position:relative}.hero:before{content:"";background:linear-gradient(0deg, var(--bg) 4%, #1414148c 50%, #14141433);position:absolute;inset:0}.hero .wrap{position:relative}.hero h1{max-width:720px;font-size:clamp(28px,6vw,52px);line-height:1.05}.hero p{color:#ddd;max-width:620px;margin:12px 0 18px}.shelf{margin:26px 0}.shelf h2{margin-bottom:10px;font-size:18px}.rail{scroll-snap-type:x mandatory;scrollbar-width:thin;grid-auto-columns:minmax(230px,30%);grid-auto-flow:column;gap:10px;padding-bottom:8px;display:grid;overflow-x:auto}@media (max-width:640px){.rail{grid-auto-columns:72%}}.tile{scroll-snap-align:start;background:var(--bg-3);aspect-ratio:16/9;border-radius:10px;text-decoration:none;transition:transform .15s;display:block;position:relative;overflow:hidden}.tile:hover{transform:scale(1.03)}.tile img{object-fit:cover;width:100%;height:100%}.tile .ph{text-align:center;background:linear-gradient(135deg, var(--accent), #000);place-items:center;width:100%;height:100%;padding:12px;font-weight:800;display:grid}.tile .meta{background:linear-gradient(#0000,#000000d9);padding:8px 10px;font-size:13px;font-weight:600;position:absolute;inset:auto 0 0}.tile .bar{background:#ffffff40;border-radius:2px;height:4px;margin-top:6px;overflow:hidden}.tile .bar span{background:var(--brand);height:100%;display:block}.tile.locked img,.tile.locked .ph{filter:grayscale(.85)brightness(.55)}.tile .lock{background:#000000b3;border-radius:999px;padding:4px 9px;font-size:12px;font-weight:700;position:absolute;top:8px;right:8px}.course-head{gap:20px;padding:26px 0;display:grid}@media (min-width:860px){.course-head{grid-template-columns:320px 1fr;align-items:end}}.course-head .cover{background:var(--bg-3);aspect-ratio:16/9;border-radius:12px;overflow:hidden}.module{margin:18px 0}.module h3{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;font-size:16px}.lesson-link{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;align-items:center;gap:12px;margin-bottom:8px;padding:12px 14px;text-decoration:none;display:flex}.lesson-link .kind{color:var(--muted);min-width:52px;font-size:12px}.lesson-link .done{color:var(--ok);margin-left:auto;font-size:13px}.lesson-link.current{border-color:var(--brand)}.player-layout{gap:20px;padding:18px 0 40px;display:grid}@media (min-width:980px){.player-layout{grid-template-columns:1fr 340px}}.player{aspect-ratio:16/9;background:#000;border-radius:12px;width:100%;overflow:hidden}.player video{width:100%;height:100%}.pdf-frame{background:#fff;border:0;border-radius:12px;width:100%;height:75vh}.prose{white-space:pre-wrap;line-height:1.7}.admin-shell{grid-template-rows:auto 1fr;min-height:100dvh;display:grid}.admin-nav{flex-wrap:wrap;gap:6px;padding:10px 0;display:flex}.admin-nav a{background:var(--bg-2);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:14px;text-decoration:none}.table{border-collapse:collapse;width:100%;font-size:14px}.table th,.table td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:10px 8px}.table th{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:600}.badge{background:var(--bg-3);border:1px solid var(--line);border-radius:999px;padding:2px 8px;font-size:12px;display:inline-block}.badge.ok{color:var(--ok);border-color:var(--ok)}.badge.err{color:var(--danger);border-color:var(--danger)}.grid-2{gap:14px;display:grid}@media (min-width:860px){.grid-2{grid-template-columns:1fr 1fr}}.scroll-x{overflow-x:auto}h1.page{margin:18px 0 12px;font-size:24px}h2.section{margin:22px 0 10px;font-size:18px}