:root{--blue:#2563eb;--blue2:#1d4ed8;--orange:#f59e0b;--green:#16a34a;--red:#dc2626;--ink:#0f172a;--muted:#64748b;--card:rgba(255,255,255,.94);--border:rgba(37,99,235,.16);--shadow:0 18px 50px rgba(15,23,42,.14);--radius:24px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at top left,#bfdbfe 0,transparent 30%),radial-gradient(circle at bottom right,#fed7aa 0,transparent 32%),linear-gradient(135deg,#e0f2fe,#fff7ed);color:var(--ink);min-height:100vh}a{color:inherit;text-decoration:none}.container{width:min(1180px,calc(100% - 24px));margin:0 auto;padding:16px 0}.nav{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.brand{display:flex;align-items:center;gap:12px}.logo{width:54px;height:54px;border-radius:18px;background:linear-gradient(135deg,var(--blue),var(--orange));display:grid;place-items:center;color:#fff;font-size:28px;box-shadow:var(--shadow)}h1,h2,h3{letter-spacing:-.03em}.brand h1{font-size:clamp(20px,3vw,34px);margin:0}.brand p{margin:3px 0 0;color:var(--muted);font-weight:700}.navlinks{display:flex;gap:8px;flex-wrap:wrap}.btn,button,input[type=submit]{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:16px;padding:11px 15px;font-weight:900;background:#e2e8f0;color:#0f172a;cursor:pointer;transition:.15s}.btn:hover,button:hover,input[type=submit]:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(15,23,42,.14)}.btn.primary,button.primary{background:var(--blue);color:#fff}.btn.orange,button.orange{background:var(--orange);color:#431407}.btn.green,button.green{background:var(--green);color:#fff}.btn.red,button.red{background:#fee2e2;color:#991b1b}.grid{display:grid;gap:16px}.grid.two{grid-template-columns:1fr 1fr}.grid.side{grid-template-columns:1.2fr .8fr}.card{background:var(--card);border:1px solid rgba(255,255,255,.7);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.hero{padding:28px}.hero h2{font-size:clamp(32px,6vw,70px);line-height:1;margin:0 0 12px}.hero p{font-size:clamp(18px,2.3vw,26px);line-height:1.45;font-weight:750;color:#334155}.lesson-card{display:grid;gap:10px}.lesson-card h3{margin:0;font-size:24px}.badge{display:inline-flex;align-items:center;width:max-content;border-radius:999px;padding:6px 10px;background:#dbeafe;color:#1d4ed8;font-size:13px;font-weight:900}.muted{color:var(--muted)}.admin-layout{display:grid;grid-template-columns:240px 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rotate(360deg);opacity:0}}@media(max-width:860px){.grid.two,.grid.side,.admin-layout,.learn-layout{grid-template-columns:1fr}.sidebar{position:static}.nav{align-items:flex-start}.navlinks{justify-content:flex-end}.brand p{display:none}.card{padding:14px}.video-box{border-width:3px;border-radius:18px}table{min-width:640px}}@media(max-width:520px){.container{width:min(100% - 16px,1180px)}.logo{width:46px;height:46px}.brand h1{font-size:20px}.navlinks .btn{padding:9px 10px;font-size:14px}.hero{padding:18px}.big-title{font-size:31px}}