:root{--bg:#0b0e14;--bg-elevated:#131722;--bg-card:#161b28;--border:#262c3d;--text:#e6e9f0;--text-dim:#8b92a8;--text-faint:#5a6178;--accent:#6d8dff;--c-dsa:#6d8dff;--c-hld:#b083ff;--c-lld:#4fd6c4;--c-ai:#ff7ac6;--c-go:#52d6a2;--c-sql:#ffb84f;--radius:14px;--shadow:0 8px 24px rgba(0,0,0,0.35)}*{box-sizing:border-box}body,html{padding:0;margin:0;background:var(--bg);color:var(--text);font-family:SF Pro Display,-apple-system,BlinkMacSystemFont,Inter,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:1180px;margin:0 auto;padding:0 24px 64px}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:rgba(11,14,20,.85);border-bottom:1px solid var(--border)}.nav-inner{max-width:1180px;margin:0 auto;padding:14px 24px;justify-content:space-between;gap:16px}.brand,.nav-inner{display:flex;align-items:center}.brand{font-weight:700;font-size:15px;gap:8px;white-space:nowrap}.brand-dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(135deg,var(--c-ai),var(--c-dsa))}.nav-links{display:flex;gap:4px;flex-wrap:wrap}.nav-link{padding:7px 13px;border-radius:999px;font-size:13px;font-weight:600;color:var(--text-dim);transition:all .15s ease}.nav-link:hover{color:var(--text);background:var(--bg-card)}.nav-link.active{color:#0b0e14;background:var(--accent)}.streak-badge{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;background:var(--bg-card);border:1px solid var(--border);font-size:13px;font-weight:700;white-space:nowrap}h1{font-size:26px;margin:32px 0 4px;letter-spacing:-.02em}h2{font-size:18px;margin:0 0 12px;letter-spacing:-.01em}.subtitle{color:var(--text-dim);font-size:14px;margin:0 0 28px}.card{background:var(--bg-card);border:1px solid 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