/* hero */
.hero{padding:84px 0 64px}
.hero h1 span{background:linear-gradient(120deg,var(--acc-2),var(--acc));-webkit-background-clip:text;
  background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(1rem,1.6vw,1.2rem);color:var(--muted);max-width:620px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 30px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.stats{display:flex;gap:28px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:20px}
.stat b{display:block;font-size:1.5rem;letter-spacing:-.02em}
.stat span{font-size:.82rem;color:var(--muted)}
.mock{background:var(--elev);border:1px solid var(--line);border-radius:var(--r-lg);padding:14px;
  box-shadow:var(--shadow)}
.mock-bar{display:flex;gap:6px;margin-bottom:12px}
.mock-bar i{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.mock-screen{aspect-ratio:16/10;border-radius:var(--r);background:
  linear-gradient(150deg,#1d2433,#101521 60%),radial-gradient(circle at 70% 30%,rgba(255,157,63,.25),transparent 55%);
  display:grid;place-items:center;position:relative;overflow:hidden}
.play{width:62px;height:62px;border-radius:50%;background:rgba(255,157,63,.95);display:grid;place-items:center;
  color:#1a1204;font-size:1.3rem;box-shadow:0 0 0 12px rgba(255,157,63,.12)}
.mock-rows{margin-top:12px;display:grid;gap:8px}
.mock-rows i{height:9px;border-radius:6px;background:var(--line);display:block}
.mock-rows i:nth-child(2){width:72%}.mock-rows i:nth-child(3){width:45%}
/* cards */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--elev);border:1px solid var(--line);border-radius:var(--r);padding:22px;transition:.18s}
.card:hover{border-color:var(--line-2);transform:translateY(-2px)}
.card .ico{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;font-size:1.15rem;
  background:rgba(255,157,63,.12);border:1px solid rgba(255,157,63,.22);margin-bottom:14px}
.card p{color:var(--muted);font-size:.93rem;margin:0}
.card ul{margin:12px 0 0;padding-left:18px;color:var(--muted);font-size:.9rem}
.card ul li{margin-bottom:5px}
.tag{display:inline-block;font-size:.74rem;padding:3px 9px;border-radius:999px;border:1px solid var(--line-2);
  color:var(--muted);background:var(--bg-2)}
.tag.acc{color:var(--acc);border-color:rgba(255,157,63,.3);background:rgba(255,157,63,.08)}
.tag.ok{color:var(--ok);border-color:rgba(79,209,139,.3);background:rgba(79,209,139,.08)}
/* steps */
.steps{counter-reset:s;display:grid;gap:14px}
.step{display:flex;gap:16px;align-items:flex-start;background:var(--bg-2);border:1px solid var(--line);
  border-radius:var(--r);padding:18px 20px}
.step::before{counter-increment:s;content:counter(s);flex:0 0 32px;height:32px;border-radius:9px;
  display:grid;place-items:center;font-weight:800;color:var(--acc);background:rgba(255,157,63,.1);
  border:1px solid rgba(255,157,63,.24);font-size:.9rem}
.step p{margin:4px 0 0;color:var(--muted);font-size:.92rem}
/* faq */
details{background:var(--elev);border:1px solid var(--line);border-radius:var(--r);padding:16px 20px;margin-bottom:10px}
details[open]{border-color:var(--line-2)}
summary{cursor:pointer;font-weight:600;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--acc);font-weight:700}
details[open] summary::after{content:"–"}
details p{margin:10px 0 0;color:var(--muted);font-size:.93rem}
/* cta band */
.band{background:linear-gradient(140deg,rgba(255,157,63,.14),rgba(122,162,255,.10));
  border:1px solid var(--line-2);border-radius:var(--r-lg);padding:38px;text-align:center}
/* auth */
.auth{min-height:calc(100vh - 66px);display:grid;place-items:center;padding:44px 20px}
.auth-box{width:100%;max-width:410px;background:var(--elev);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:32px;box-shadow:var(--shadow)}
.field{margin-bottom:16px}
.field label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:7px}
.field input{width:100%;background:var(--bg-2);border:1px solid var(--line-2);color:var(--txt);
  border-radius:var(--r-sm);padding:12px 14px;font:inherit;transition:.16s}
.field input:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px rgba(255,157,63,.14)}
.row-between{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:.85rem}
.alert{border-radius:var(--r-sm);padding:11px 13px;font-size:.88rem;margin-bottom:14px;display:none}
.alert.err{display:block;background:rgba(255,90,90,.1);border:1px solid rgba(255,90,90,.32);color:#ffb3b3}
.hint{font-size:.82rem;color:var(--muted);background:var(--bg-2);border:1px dashed var(--line-2);
  border-radius:var(--r-sm);padding:11px 13px;margin-top:18px}
.hint code{color:var(--acc-2)}
/* lessons */
.lay{display:grid;grid-template-columns:250px 1fr;gap:26px;padding:34px 0 64px;align-items:start}
.side{position:sticky;top:90px;display:grid;gap:8px}
.side h4{margin:0 0 4px;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.filter{text-align:left;background:none;border:1px solid transparent;color:var(--muted);font:inherit;
  font-size:.92rem;padding:10px 12px;border-radius:var(--r-sm);cursor:pointer;display:flex;
  justify-content:space-between;gap:8px;transition:.15s}
.filter:hover{background:var(--elev);color:var(--txt)}
.filter.on{background:var(--elev-2);color:var(--txt);border-color:var(--acc)}
.filter b{color:var(--dim);font-weight:600;font-size:.82rem}
.player{background:#000;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-bottom:18px}
.player video,.player iframe{width:100%;aspect-ratio:16/9;border:0;display:block;background:#000}
.pbody{background:var(--elev);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-bottom:26px}
.pbody h2{font-size:1.35rem;margin-bottom:8px}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px;align-items:center}
.lgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(238px,1fr));gap:16px}
.lcard{background:var(--elev);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  cursor:pointer;transition:.18s;text-align:left;padding:0;color:inherit;font:inherit}
.lcard:hover{border-color:var(--acc);transform:translateY(-2px)}
.lcard.on{border-color:var(--acc);box-shadow:0 0 0 3px rgba(255,157,63,.13)}
.thumb{aspect-ratio:16/9;background:linear-gradient(150deg,#1e2534,#0f1420);display:grid;place-items:center;
  position:relative;color:var(--acc);font-size:1.5rem}
.thumb .dur{position:absolute;right:8px;bottom:8px;background:rgba(0,0,0,.72);color:#fff;font-size:.72rem;
  padding:2px 7px;border-radius:6px}
.thumb .seen{position:absolute;left:8px;top:8px;background:rgba(79,209,139,.9);color:#06261a;font-size:.7rem;
  padding:2px 7px;border-radius:6px;font-weight:700}
.lcard .b{padding:13px 15px 16px}
.lcard .b h3{font-size:.97rem;margin-bottom:6px}
.lcard .b p{margin:0;font-size:.84rem;color:var(--muted)}
.bar{height:6px;border-radius:99px;background:var(--line);overflow:hidden;margin:10px 0 0}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--acc),var(--acc-2));width:0;transition:.4s}
.uchip{display:flex;align-items:center;gap:9px;background:var(--elev);border:1px solid var(--line);
  border-radius:999px;padding:5px 6px 5px 12px;font-size:.88rem}
.uchip i{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-style:normal;
  font-size:.8rem;font-weight:700;color:#1a1204;background:linear-gradient(140deg,var(--acc-2),var(--acc))}
.empty{border:1px dashed var(--line-2);border-radius:var(--r);padding:40px;text-align:center;color:var(--muted)}
@media (max-width:900px){
  .hero-grid,.g3,.g2{grid-template-columns:1fr}
  .lay{grid-template-columns:1fr}
  .side{position:static;grid-auto-flow:column;overflow-x:auto;padding-bottom:6px}
  .side h4{display:none}
  .filter{white-space:nowrap}
}