:root{--bg:#ffffff;--fg:#0a0a0a;--muted:#666666;--card:#f8f9fa;--border:#e5e7eb;--accent:#2563eb;--accent-hover:#1d4ed8;--shadow:rgba(0,0,0,0.08);--shadow-hover:rgba(0,0,0,0.12);--radius:8px;--maxw:720px;--header-bg:rgba(255,255,255,0.85);--progress-bg:rgba(37,99,235,0.15)}@media 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