:root{
  --bg:#0b1220;--surface:#111c2f;--surface2:#16243a;--border:rgba(255,255,255,.10);
  --gold:#f1c40f;--gold2:#ffd166;--text:#e8eef8;--muted:#9fb0c7;
  --blue:#58a6ff;--green:#3fb950;--red:#f85149;--purple:#bc8cff;
}
*{box-sizing:border-box;margin:0;padding:0}
*::-webkit-scrollbar{width:8px;height:8px}
*::-webkit-scrollbar-track{background:var(--bg)}
*::-webkit-scrollbar-thumb{background:#2c3d59;border-radius:999px;border:1px solid var(--bg)}
body{font-family:Tahoma,Arial,sans-serif;background:
radial-gradient(circle at top right,rgba(241,196,15,.08),transparent 32%),
linear-gradient(180deg,#08111f,var(--bg));color:var(--text);min-height:100vh;line-height:1.9}
a{color:inherit;text-decoration:none}
.toolbar{height:88px;background:rgba(8,17,31,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.toolbar-inner{max-width:1180px;margin:auto;height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 18px;gap:14px}
.brand{display:flex;align-items:center;gap:12px}
.logo{height:58px;max-width:86px;object-fit:contain;border:1px solid rgba(241,196,15,.55);border-radius:15px;background:rgba(11,26,54,.6)}
.brand-name{font-weight:900;color:var(--gold);font-size:1rem}
.brand-tag{font-size:.72rem;color:var(--muted)}
.nav-actions{display:flex;gap:8px;flex-wrap:wrap}
.nav-btn{border:1px solid rgba(241,196,15,.28);color:var(--gold);padding:8px 12px;border-radius:10px;background:rgba(241,196,15,.06);font-size:.82rem;font-weight:800}
.page{max-width:1180px;margin:auto;padding:18px 16px 70px}
.hero{border:1px solid var(--border);background:linear-gradient(135deg,rgba(241,196,15,.10),transparent 42%),rgba(17,28,47,.92);border-radius:22px;padding:24px;display:grid;grid-template-columns:1.2fr .8fr;gap:22px;margin-bottom:18px}
.kicker{display:inline-flex;border:1px solid rgba(241,196,15,.28);color:var(--gold2);background:rgba(241,196,15,.07);border-radius:999px;padding:4px 10px;font-size:.75rem;font-weight:800;margin-bottom:10px}
h1{font-size:clamp(1.6rem,4vw,2.8rem);line-height:1.35;color:#fff;margin-bottom:8px}
.hero p,.lead{color:var(--muted);font-size:.95rem}
.hero-card{background:#08111f;border:1px solid var(--border);border-radius:18px;padding:16px}
.stat{display:flex;justify-content:space-between;border-bottom:1px dashed rgba(255,255,255,.12);padding:8px 0;color:var(--muted);font-size:.86rem}
.stat:last-child{border-bottom:0}.stat strong{color:var(--gold)}
.section-title{font-size:1.15rem;color:#fff;margin:22px 0 10px;display:flex;align-items:center;gap:8px}
.section-title:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--gold)}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{background:rgba(17,28,47,.94);border:1px solid var(--border);border-radius:18px;padding:15px;min-height:190px;display:flex;flex-direction:column;justify-content:space-between;transition:.16s}
.card:hover{transform:translateY(-3px);border-color:rgba(241,196,15,.42);box-shadow:0 14px 40px rgba(0,0,0,.22)}
.badge{color:#08111f;background:var(--gold);border-radius:999px;padding:3px 8px;font-size:.68rem;font-weight:900;display:inline-flex;width:max-content;margin-bottom:10px}
.card h3{color:#fff;font-size:.95rem;line-height:1.6;margin-bottom:6px}
.card p{color:var(--muted);font-size:.78rem;line-height:1.75}
.route{display:flex;justify-content:space-between;align-items:center;color:var(--gold);font-weight:900;font-size:.8rem;margin-top:12px}
.lesson-layout{display:grid;grid-template-columns:260px 1fr;gap:14px;align-items:start}
.sidebar{position:sticky;top:104px;background:rgba(17,28,47,.94);border:1px solid var(--border);border-radius:18px;padding:12px;max-height:calc(100vh - 120px);overflow:auto}
.sidebar h2{font-size:.85rem;color:#fff;margin-bottom:8px}
.side-link{display:block;padding:8px 10px;border-radius:10px;color:var(--muted);font-size:.78rem;border:1px solid transparent}
.side-link:hover,.side-link.active{background:rgba(241,196,15,.08);border-color:rgba(241,196,15,.18);color:var(--gold)}
.lesson{background:rgba(17,28,47,.94);border:1px solid var(--border);border-radius:22px;padding:22px}
.lesson h1{font-size:2rem}
.lesson-meta{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 15px}
.pill{border:1px solid var(--border);background:#08111f;color:var(--muted);padding:4px 9px;border-radius:999px;font-size:.75rem}
.block{background:#08111f;border:1px solid var(--border);border-radius:16px;padding:16px;margin:13px 0}
.block h2{font-size:1rem;color:var(--gold);margin-bottom:8px}
.block p{color:var(--text);font-size:.92rem}
ul,ol{padding-right:22px;color:var(--text)}
li{margin:5px 0}
.code{direction:ltr;text-align:left;font-family:Consolas,monospace;background:#050b14;border:1px solid var(--border);border-radius:12px;padding:12px;color:#dce7f7;overflow:auto;line-height:1.7}
.try-box{border-color:rgba(88,166,255,.28);background:linear-gradient(135deg,rgba(88,166,255,.08),transparent),#08111f}
.challenge{border-color:rgba(241,196,15,.32);background:linear-gradient(135deg,rgba(241,196,15,.08),transparent),#08111f}
.quiz{border-color:rgba(63,185,80,.25)}
.answer{color:var(--green);font-weight:900}
.footer-nav{display:flex;justify-content:space-between;gap:10px;margin-top:16px}
.footer-nav a{border:1px solid rgba(241,196,15,.26);background:rgba(241,196,15,.06);color:var(--gold);padding:9px 12px;border-radius:12px;font-weight:900;font-size:.83rem}
.cta{display:inline-flex;align-items:center;gap:8px;background:var(--gold);color:#07101d;border-radius:12px;padding:10px 14px;font-weight:900;margin-top:10px}
.note{color:var(--muted);font-size:.82rem}
@media(max-width:980px){.grid{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr}.sidebar{position:static;max-height:none}.toolbar{height:auto}.toolbar-inner{padding:12px 16px;align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.grid{grid-template-columns:1fr}.footer-nav{flex-direction:column}.hero{padding:18px}.lesson{padding:16px}}