@import"https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap";:root{--hld-bg: var(--bg-deep);--hld-surface-1: var(--bg-surface);--hld-surface-2: var(--bg-card);--hld-card: var(--bg-card);--hld-border: var(--border-subtle);--hld-border-bright: var(--border-glass);--hld-accent: var(--primary);--hld-accent-bright: var(--primary-bright);--hld-accent-dim: rgba(99, 102, 241, .12);--hld-accent-glow: rgba(99, 102, 241, .25);--hld-green: var(--accent-emerald);--hld-green-dim: rgba(16, 185, 129, .12);--hld-amber: var(--accent-amber);--hld-amber-dim: rgba(245, 158, 11, .12);--hld-red: #ef4444;--hld-red-dim: rgba(239, 68, 68, .12);--hld-blue: #60a5fa;--hld-blue-dim: rgba(96, 165, 250, .12);--hld-text-1: var(--text-primary);--hld-text-2: #cbd5e1;--hld-text-3: var(--text-secondary);--hld-text-4: #475569;--sidebar-width: 240px;--content-max: var(--reading-width);--content-wide: 980px;--chapter-pad: clamp(24px, 5vw, 72px);--progress-h: 3px}::selection{background:var(--hld-accent-glow);color:var(--hld-text-1)}.hld-root{min-height:100vh;background:var(--hld-bg);color:var(--hld-text-2);font-family:var(--font-body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}.hld-layout{display:flex;min-height:100vh}.hld-content{flex:1;min-width:0;padding-left:var(--sidebar-width);display:flex;flex-direction:column;align-items:center}.hld-progress-bar{position:fixed;top:0;left:0;height:var(--progress-h);background:linear-gradient(90deg,var(--hld-accent),var(--hld-accent-bright));z-index:200;transition:width .1s linear;box-shadow:0 0 10px var(--hld-accent-glow)}.hld-chapter{width:100%;max-width:var(--content-wide);padding:64px var(--chapter-pad) 120px;counter-reset:sec}.hld-chapter .hld-chapter-hero,.hld-chapter .sec-head,.hld-chapter .hld-h2,.hld-chapter .hld-h3,.hld-chapter .hld-body,.hld-chapter .hld-ul,.hld-chapter .hld-ol,.hld-chapter 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