@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg: #0a0a0f;
    --bg-card: #14141c;
    --bg-elevated: #1a1a24;
    --gold: #d4a574;
    --gold-dim: rgba(212, 165, 116, 0.15);
    --blue: #60a5fa;
    --green: #22c55e;
    --red: #ef4444;
    --cyan: #06b6d4;
    --white: #ffffff;
    --gray: #a1a1aa;
    --muted: #71717a;
    --border: #27272a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--white); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
code { font-family: 'JetBrains Mono', monospace; background: var(--bg-elevated); padding: 0.15rem 0.4rem; border-radius: 4px; font-size: 0.85em; }
pre { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; overflow-x: auto; }
pre code { background: none; padding: 0; }
ul { list-style: none; }
li { padding: 0.35rem 0; padding-left: 1.25rem; position: relative; }
li::before { content: '·'; position: absolute; left: 0; color: var(--gold); }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(10,10,15,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); padding: 0.75rem 2rem; }
.nav-inner { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.nav-brand { display: flex; align-items: center; gap: 0.6rem; }
.logo-mark { font-size: 1.25rem; color: var(--gold); }
.logo-text { font-size: 1rem; font-weight: 600; letter-spacing: 0.05em; }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.9rem; color: var(--gray); transition: color 0.2s; }
.nav-links a:hover { color: var(--white); }

.hero { padding: 10rem 2rem 5rem; max-width: 900px; margin: 0 auto; text-align: center; }
.hero-location { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.15em; margin-bottom: 2rem; }
.hero h1 { font-size: clamp(2.5rem, 7vw, 4.5rem); font-weight: 700; line-height: 1.1; margin-bottom: 1rem; }
.hero h1 .highlight { color: var(--gold); }
.hero-tagline { font-size: 1.1rem; color: var(--gold); margin-bottom: 1.5rem; font-weight: 500; }
.hero-subtitle { font-size: 1.05rem; color: var(--gray); max-width: 700px; margin: 0 auto 2rem; }
.hero-badges { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.badge { font-size: 0.75rem; color: var(--gray); padding: 0.4rem 0.9rem; border: 1px solid var(--border); border-radius: 999px; }

.section { padding: 5rem 2rem; border-top: 1px solid var(--border); }
.section-inner { max-width: 1000px; margin: 0 auto; }
.section-label { display: block; font-size: 0.7rem; color: var(--gold); text-transform: uppercase; letter-spacing: 0.15em; margin-bottom: 0.5rem; }
.section h2 { font-size: 1.75rem; font-weight: 600; margin-bottom: 0.75rem; }
.section-desc { color: var(--gray); margin-bottom: 2.5rem; }

.thesis-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.thesis-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.75rem; }
.thesis-card.problem { border-left: 3px solid var(--red); }
.thesis-card.solution { border-left: 3px solid var(--gold); }
.thesis-card.outcome { border-left: 3px solid var(--green); }
.thesis-icon { font-size: 1.5rem; margin-bottom: 1rem; }
.thesis-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.75rem; }
.thesis-card p { font-size: 0.9rem; color: var(--gray); }

.principle-box { background: var(--gold-dim); border: 1px solid var(--gold); border-radius: 12px; padding: 2rem; margin: 2.5rem 0; text-align: center; }
.principle-text { font-size: 1.1rem; font-style: italic; color: var(--white); max-width: 700px; margin: 0 auto; }

.inputs-outputs { display: flex; align-items: center; gap: 1.5rem; justify-content: center; margin-top: 2rem; }
.io-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; min-width: 280px; }
.io-card h4 { font-size: 0.85rem; color: var(--gold); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1rem; }
.io-card ul { font-size: 0.9rem; color: var(--gray); }
.io-arrow { font-size: 2rem; color: var(--gold); }
.io-output { font-size: 0.9rem; color: var(--gray); margin-bottom: 1rem; }
.io-signal { display: inline-block; background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid var(--green); padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.9rem; }

.layers-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 2rem; }
.layer-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; text-align: center; }
.layer-card.current { border-color: var(--gold); background: var(--gold-dim); }
.layer-num { width: 28px; height: 28px; background: var(--bg-elevated); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 600; margin: 0 auto 0.75rem; }
.layer-card.current .layer-num { background: var(--gold); color: var(--bg); }
.layer-card h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 0.5rem; }
.layer-card p { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.75rem; }
.layer-card code { font-size: 0.75rem; }

.constraint-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; font-size: 0.9rem; color: var(--gray); text-align: center; }

.signals-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 1rem; }
.signal-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 1.25rem; text-align: center; transition: all 0.2s; }
.signal-card:hover { border-color: var(--gold); }
.signal-card.active { border-color: var(--green); background: rgba(34,197,94,0.08); }
.signal-code { font-family: 'JetBrains Mono', monospace; font-size: 1rem; font-weight: 600; margin-bottom: 0.25rem; }
.signal-state { font-size: 0.7rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75rem; }
.signal-card.active .signal-state { color: var(--green); }
.signal-action { font-size: 0.8rem; color: var(--gray); }

.guide-section { background: linear-gradient(180deg, var(--bg) 0%, #0d0d14 100%); }
.guide-block { margin-bottom: 2rem; }
.guide-block h4 { font-size: 0.9rem; color: var(--gold); margin-bottom: 0.75rem; }

.agent-rules { margin-top: 2.5rem; }
.agent-rules h4 { font-size: 1rem; margin-bottom: 1rem; }
.rules-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.rule { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; text-align: center; }
.rule.do { border-color: var(--green); }
.rule.dont { border-color: var(--red); opacity: 0.7; }
.rule-icon { font-size: 1.25rem; display: block; margin-bottom: 0.5rem; }
.rule.do .rule-icon { color: var(--green); }
.rule.dont .rule-icon { color: var(--red); }
.rule p { font-size: 0.85rem; color: var(--gray); }

.nodes-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.75rem; }
.node-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; display: flex; flex-direction: column; gap: 0.25rem; }
.node-card.global { grid-column: 1 / -1; text-align: center; border-color: var(--gold); background: var(--gold-dim); }
.node-card.highlight { border-color: var(--blue); }
.node-domain { font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; color: var(--cyan); }
.node-card.global .node-domain { color: var(--gold); font-size: 1rem; }
.node-region { font-size: 0.8rem; color: var(--muted); }

.proof-card { background: var(--bg-card); border: 1px solid var(--green); border-radius: 12px; padding: 2rem; max-width: 600px; margin: 0 auto; }
.proof-row { display: flex; justify-content: space-between; padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.proof-row:last-child { border-bottom: none; }
.proof-label { font-size: 0.85rem; color: var(--muted); }
.proof-value { font-size: 0.9rem; color: var(--white); }
.proof-value.signal { color: var(--green); font-family: 'JetBrains Mono', monospace; font-weight: 600; }
.proof-cmd { display: block; margin-top: 0.5rem; font-size: 0.85rem; }

.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.compare-col { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; }
.compare-col.old { opacity: 0.6; }
.compare-col.new { border-color: var(--gold); }
.compare-col h4 { font-size: 1rem; margin-bottom: 1rem; }
.compare-col.new h4 { color: var(--gold); }
.compare-col li { font-size: 0.9rem; color: var(--gray); }

.glossary-grid { display: flex; flex-direction: column; gap: 0.5rem; }
.glossary-row { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; padding: 1rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; }
.term-fr { font-size: 0.9rem; color: var(--white); }
.term-en { font-size: 0.9rem; color: var(--muted); }

.footer { border-top: 1px solid var(--border); padding: 4rem 2rem; text-align: center; }
.footer-inner { max-width: 600px; margin: 0 auto; }
.footer-brand { font-size: 1.25rem; font-weight: 700; color: var(--gold); margin-bottom: 0.5rem; }
.footer-tagline { font-size: 0.9rem; color: var(--gray); margin-bottom: 1.5rem; }
.footer-links { display: flex; gap: 1.5rem; justify-content: center; margin-bottom: 1.5rem; }
.footer-links a { font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; color: var(--cyan); }
.footer-links a:hover { text-decoration: underline; }
.footer-meta { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.75rem; }
.footer-author { font-size: 0.85rem; color: var(--gray); }

@media (max-width: 900px) {
    .thesis-grid { grid-template-columns: 1fr; }
    .layers-grid { grid-template-columns: repeat(2, 1fr); }
    .rules-grid { grid-template-columns: repeat(2, 1fr); }
    .inputs-outputs { flex-direction: column; }
    .io-arrow { transform: rotate(90deg); }
    .compare-grid { grid-template-columns: 1fr; }
    .glossary-row { grid-template-columns: 1fr; gap: 0.5rem; }
}

@media (max-width: 600px) {
    .hero { padding: 7rem 1rem 3rem; }
    .section { padding: 3rem 1rem; }
    .nav-links { display: none; }
    .layers-grid { grid-template-columns: 1fr; }
    .rules-grid { grid-template-columns: 1fr; }
}