:root{--color-brand:#2563eb;--color-brand-dark:#1d4ed8;--color-accent:#0ea5e9;--color-ink:#0f172a;--color-contrast:#0f1c24;--color-muted:#64748b;--color-surface:#ffffff;--color-page:#f8fafc;--color-line:#e2e8f0;--color-success:#16a34a;--color-warning:#d97706;--color-danger:#dc2626;--yt-on-brand:#ffffff;--yt-on-brand-dark:#ffffff;--yt-on-accent:#0f172a;--yt-on-ink:#ffffff;--yt-on-success:#0f172a;--yt-on-warning:#0f172a;--yt-on-danger:#ffffff;--font-display:'Inter',system-ui,sans-serif;--font-sans:'Inter',system-ui,sans-serif;--font-mono:'JetBrains Mono',ui-monospace,monospace;--radius-card:14px;--container-site:1180px;--spacing-gutter:1.5rem;--spacing-section:4.5rem;--yt-shadow-card:0 8px 24px rgba(15,23,42,.06);--yt-shadow-cardlg:0 18px 48px rgba(15,23,42,.12);--text-xs:0.6944rem;--text-xs--line-height:1.61;--text-sm:0.8333rem;--text-sm--line-height:1.555;--text-base:1rem;--text-base--line-height:1.5;--text-lg:1.2rem;--text-lg--line-height:1.445;--text-xl:1.44rem;--text-xl--line-height:1.39;--text-2xl:1.728rem;--text-2xl--line-height:1.335;--text-3xl:2.0736rem;--text-3xl--line-height:1.28;--text-4xl:2.4883rem;--text-4xl--line-height:1.225;--text-5xl:2.986rem;--text-5xl--line-height:1.17;--text-6xl:3.5832rem;--text-6xl--line-height:1.115;--text-7xl:4.2998rem;--text-7xl--line-height:1.06}