:root{--bg-deep: #070605;--bg-card: rgba(20, 16, 14, .72);--bg-elevated: rgba(28, 22, 18, .88);--border: rgba(251, 146, 60, .14);--border-strong: rgba(251, 146, 60, .28);--text: #f5f0eb;--text-muted: #a8a29e;--accent: #f97316;--accent-soft: #fb923c;--accent-glow: rgba(249, 115, 22, .35);--gold: #fbbf24;--radius: 14px;--radius-lg: 22px;--font-sans: "DM Sans", system-ui, sans-serif;--font-serif: "Instrument Serif", Georgia, serif;--shadow: 0 24px 80px rgba(0, 0, 0, .45);--transition: .22s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;font-family:var(--font-sans);font-size:1rem;line-height:1.6;color:var(--text);background:var(--bg-deep);background-image:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(249,115,22,.18),transparent),radial-gradient(ellipse 60% 40% at 100% 50%,rgba(251,191,36,.06),transparent),radial-gradient(ellipse 50% 30% at 0% 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var(--border);text-align:center}.site-footer p{margin:0 0 .5rem;font-size:.95rem;color:var(--text-muted)}.footer-copy{font-size:.8rem;opacity:.7}@media(max-width:900px){.site-header{flex-direction:column;align-items:stretch}.nav-tabs--header{justify-content:flex-start;margin-left:0}.nav-tabs-list{justify-content:flex-end}}@media(max-width:640px){.nav-tab-trigger{font-size:.78rem;padding:.45rem .75rem}.nav-dropdown{right:0;left:auto}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.topic-page{animation:none}.btn:hover,.roadmap-card:hover{transform:none}}.auth-page{display:flex;justify-content:center;padding:2rem 1rem 4rem;min-height:60vh}.auth-card{width:100%;max-width:420px;padding:2rem;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow)}.auth-card h1{margin:0 0 .5rem;font-family:var(--font-serif);font-size:1.75rem;font-weight:400}.auth-subtitle{margin:0 0 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