:root{--surface-dark: #0a0f1a;--surface-dark-raised: #111827;--surface-dark-subtle: #1e293b;--surface-light: #fafaf8;--surface-light-raised: #ffffff;--surface-light-subtle: #f1f5f9;--border-dark: rgba(255, 255, 255, .08);--border-light: #e2e8f0;--border-focus: #38bdf8;--text-dark-primary: #f1f5f9;--text-dark-secondary: #94a3b8;--text-dark-muted: #64748b;--text-light-primary: #0f172a;--text-light-secondary: #475569;--text-light-muted: #94a3b8;--accent: #38bdf8;--accent-hover: #0ea5e9;--accent-subtle: rgba(56, 189, 248, .12);--accent-gold: #ffd700;--accent-orange: #ff8f40;--glow-gold: rgba(255, 215, 0, .35);--glow-orange: rgba(255, 143, 64, .3);--severity-info: #6b7280;--severity-opportunity: #22c55e;--severity-warning: #f59e0b;--hover-dark: rgba(255, 255, 255, .05);--hover-light: rgba(0, 0, 0, .03);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .15);--font-serif: "Instrument Serif", Georgia, 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var(--space-lg);position:relative}.section__title{font-family:var(--font-serif);font-size:clamp(1.8rem,4vw,2.8rem);color:var(--text-dark-primary);text-align:center;margin-bottom:var(--space-md)}.section__subtitle{font-family:var(--font-sans);font-size:clamp(.95rem,2vw,1.1rem);color:var(--text-dark-secondary);text-align:center;max-width:640px;margin:0 auto var(--space-xl);line-height:1.6}.section__note{font-family:var(--font-mono);font-size:12px;color:var(--text-dark-muted);text-align:center;margin-top:var(--space-xl)}.problem-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-xl);max-width:960px;margin:0 auto}.problem-card{background:#ffffff0d;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:var(--space-xl);transition:all .2s ease}.problem-card:hover{border-color:var(--accent);transform:translateY(-4px)}.problem-card__number{font-family:var(--font-mono);color:var(--accent);font-size:13px;margin-bottom:var(--space-sm)}.problem-card__title{font-family:var(--font-sans);color:var(--text-dark-primary);font-size:18px;font-weight:600;margin-bottom:var(--space-md)}.problem-card__body{font-family:var(--font-sans);color:var(--text-dark-secondary);font-size:14px;line-height:1.6}.section__rule{border:none;height:1px;background:#ffffff0f;max-width:960px;margin:var(--space-xl) auto}.section--two-sources{background:var(--surface-dark-raised)}.layers{display:flex;flex-direction:column;align-items:center;gap:var(--space-lg);max-width:640px;margin:var(--space-2xl) auto 0}.layer{width:100%;padding:var(--space-xl);border-radius:16px;text-align:center}.layer--retrieval{background:#ffffff0a;border:1px solid rgba(255,255,255,.06)}.layer--parametric{background:#38bdf80f;border:1px solid rgba(56,189,248,.15);border-left:2px solid var(--accent)}.layer__title{font-family:var(--font-sans);color:var(--text-dark-primary);font-size:20px;font-weight:600;margin-bottom:var(--space-sm)}.layer__desc{font-family:var(--font-sans);color:var(--text-dark-secondary);font-size:14px;line-height:1.6;margin-bottom:var(--space-md)}.layer__tag{font-family:var(--font-mono);font-size:12px;color:var(--text-dark-muted)}.layer__tag--accent{color:var(--accent);font-weight:600}.layers__divider{color:var(--text-dark-muted);font-family:var(--font-mono);font-size:12px}.segment-demo{max-width:800px;margin:var(--space-2xl) auto 0;padding:var(--space-xl);background:#ffffff08;border:1px solid rgba(255,255,255,.06);border-radius:16px}.segment-demo__concept{font-family:var(--font-mono);color:var(--text-dark-secondary);font-size:13px;text-align:center;margin-bottom:var(--space-xl)}.segment-demo__track{position:relative;padding:0 var(--space-sm)}.segment-demo__gradient{position:absolute;left:0;right:0;top:50%;height:3px;transform:translateY(-50%);background:linear-gradient(to right,#b82e2e,#b8b82e,#2eb82e);border-radius:2px;z-index:0}.segment-demo__nodes{display:flex;justify-content:space-between;align-items:center;position:relative;z-index:1}.segment-demo__node{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:0}.segment-demo__score{font-family:var(--font-mono);font-size:11px;color:var(--text-dark-muted);white-space:nowrap}.segment-demo__dot{width:10px;height:10px;border-radius:50%;background:var(--text-dark-muted);flex-shrink:0}.segment-demo__name{font-family:var(--font-sans);font-size:11px;color:var(--text-dark-secondary);white-space:nowrap;text-align:center}.segment-demo__node--highlight .segment-demo__dot{background:var(--accent);box-shadow:0 0 8px #38bdf880;width:12px;height:12px}.segment-demo__node--highlight .segment-demo__name{color:var(--accent);font-weight:600}.segment-demo__node--highlight .segment-demo__score{color:var(--accent)}.segment-demo__legend{display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:11px;color:var(--text-dark-muted);margin-top:var(--space-md)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-xl);max-width:960px;margin:0 auto;text-align:center}.stat__number{display:block;font-family:var(--font-mono);font-size:clamp(2rem,5vw,3.5rem);color:var(--accent);font-weight:700;margin-bottom:var(--space-sm)}.stat__label{font-family:var(--font-sans);font-size:14px;color:var(--text-dark-secondary);line-height:1.5}.template-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--space-sm);margin-top:var(--space-lg)}.template-pill{display:inline-flex;align-items:center;gap:var(--space-xs);background:#ffffff0f;border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:8px 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