:root {
  --bg: #0a0d1a;
  --bg-elev: #141828;
  --bg-deep: #070910;
  --border: rgba(232, 184, 76, 0.15);
  --border-strong: rgba(232, 184, 76, 0.35);
  --gold: #e8b84c;
  --gold-bright: #f4c860;
  --gold-muted: #a89368;
  --cream: #f3ead2;
  --cream-dim: #c9c0a5;
  --text-muted: #7a8194;
  --terminal-bg: #0c0f1c;
  --success: #9bd68a;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.6);

  --font-display: 'Cinzel', serif;
  --font-serif: 'Cormorant Garamond', serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --radius: 12px;
  --max-w: 1080px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 20px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 18% 8%, rgba(58, 106, 122, 0.14), transparent 55%),
    radial-gradient(ellipse at 82% 60%, rgba(232, 184, 76, 0.06), transparent 55%),
    radial-gradient(ellipse at 50% 100%, rgba(20, 30, 60, 0.35), transparent 60%);
  pointer-events: none;
  z-index: -2;
}

.starfield {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(243, 234, 210, 0.55), transparent 40%),
    radial-gradient(1px 1px at 30% 70%, rgba(243, 234, 210, 0.35), transparent 40%),
    radial-gradient(1px 1px at 55% 15%, rgba(243, 234, 210, 0.45), transparent 40%),
    radial-gradient(1px 1px at 75% 80%, rgba(243, 234, 210, 0.3), transparent 40%),
    radial-gradient(1px 1px at 85% 35%, rgba(243, 234, 210, 0.5), transparent 40%),
    radial-gradient(1px 1px at 40% 90%, rgba(243, 234, 210, 0.35), transparent 40%),
    radial-gradient(1px 1px at 22% 42%, rgba(243, 234, 210, 0.35), transparent 40%),
    radial-gradient(1px 1px at 63% 28%, rgba(243, 234, 210, 0.4), transparent 40%),
    radial-gradient(1.3px 1.3px at 65% 50%, rgba(232, 184, 76, 0.55), transparent 40%),
    radial-gradient(1.3px 1.3px at 15% 55%, rgba(232, 184, 76, 0.3), transparent 40%);
}

/* NAV */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 22px 24px;
  position: relative;
  z-index: 10;
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gold);
  font-size: 1.15rem;
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  gap: 24px;
}
.nav-links a {
  color: var(--cream-dim);
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: 0.02em;
  transition: color 0.18s ease;
}
.nav-links a:hover {
  color: var(--gold-bright);
}

/* HERO */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 30px 24px 80px;
  text-align: center;
}
.hero-art {
  max-width: 780px;
  margin: 0 auto 44px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 100px rgba(232, 184, 76, 0.09);
  border: 1px solid var(--border);
}
.hero-art img {
  width: 100%;
  display: block;
  height: auto;
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.28em;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  color: var(--gold-bright);
  margin: 0 0 14px;
  text-shadow: 0 0 40px rgba(232, 184, 76, 0.35);
}
.tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  color: var(--cream);
  margin: 0 0 20px;
}
.sub {
  color: var(--cream-dim);
  max-width: 680px;
  margin: 0 auto 32px;
  font-size: 1.12rem;
  line-height: 1.6;
}
.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.cta {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  font-size: 1.02rem;
  letter-spacing: 0.04em;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}
.cta-primary {
  background: var(--gold);
  color: #1a1303;
  border: 1px solid var(--gold);
}
.cta-primary:hover {
  background: var(--gold-bright);
  box-shadow: 0 0 24px rgba(232, 184, 76, 0.4);
  transform: translateY(-1px);
}
.cta-secondary {
  background: transparent;
  color: var(--cream);
  border: 1px solid var(--border-strong);
}
.cta-secondary:hover {
  border-color: var(--gold);
  color: var(--gold-bright);
}
.byline {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--cream-dim);
  font-size: 1.5rem;
  line-height: 1.4;
  margin: 12px 0 0;
}

/* SECTION */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px 24px;
  border-top: 1px solid var(--border);
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 600;
  color: var(--gold-bright);
  margin: 0 0 12px;
  text-align: center;
  letter-spacing: 0.01em;
}
.section-lede {
  text-align: center;
  color: var(--cream-dim);
  max-width: 720px;
  margin: 0 auto 36px;
  font-size: 1.1rem;
  line-height: 1.62;
}
.section-lede code {
  font-family: var(--font-mono);
  background: rgba(232, 184, 76, 0.08);
  border-radius: 4px;
  padding: 1px 7px;
  color: var(--gold);
  font-size: 0.9em;
}

/* PILLARS */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.pillar {
  background: linear-gradient(180deg, rgba(20, 24, 40, 0.6), rgba(10, 13, 26, 0.4));
  border: 1px solid var(--border);
  padding: 26px;
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.pillar:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}
.pillar h3 {
  font-family: var(--font-serif);
  color: var(--gold-bright);
  font-size: 1.45rem;
  margin: 0 0 12px;
  font-weight: 600;
  letter-spacing: 0.005em;
}
.pillar p {
  color: var(--cream-dim);
  font-size: 1.06rem;
  margin: 0;
  line-height: 1.62;
}
.pillar em {
  color: var(--gold);
  font-style: italic;
}

/* DEMO TABS */
.demo-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  max-width: 860px;
  margin: 0 auto 16px;
  padding: 4px;
  background: rgba(10, 13, 24, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.demo-tab {
  background: transparent;
  border: none;
  color: var(--cream-dim);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 11px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}
.demo-tab:hover {
  color: var(--gold-bright);
  background: rgba(232, 184, 76, 0.06);
}
.demo-tab.active {
  background: rgba(232, 184, 76, 0.14);
  color: var(--gold-bright);
  border: 1px solid var(--border-strong);
  box-shadow: 0 0 16px rgba(232, 184, 76, 0.12);
}
.demo-tab:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}
.demo-caption {
  text-align: center;
  color: var(--cream-dim);
  max-width: 760px;
  margin: 24px auto 0;
  font-style: italic;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.35rem;
  line-height: 1.5;
}

/* TERMINAL */
.terminal-wrapper {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}
.terminal {
  background: var(--terminal-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 60px rgba(232, 184, 76, 0.06);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.6;
}
.term-chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #0a0d18;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.term-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.term-dot-red { background: #ff5f56; }
.term-dot-yellow { background: #ffbd2e; }
.term-dot-green { background: #27c93f; }
.term-title {
  margin-left: auto;
  color: var(--cream-dim);
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}
.term-body {
  padding: 22px 24px;
  color: var(--cream);
  height: 960px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  white-space: pre-wrap;
  word-break: break-word;
}
.term-body::-webkit-scrollbar { width: 8px; }
.term-body::-webkit-scrollbar-track { background: transparent; }
.term-body::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}
.term-body > div { min-height: 1.55em; }
.term-body .prompt { color: var(--gold); font-weight: 500; }
.term-body .user-input { color: var(--cream); }
.term-body .muted { color: var(--text-muted); }
.term-body .route-header { color: var(--gold-bright); font-weight: 500; letter-spacing: 0.04em; }
.term-body .route-label { color: var(--gold-muted); }
.term-body .tool { color: #6fb3e0; }
.term-body .success { color: var(--success); }
.term-body .paper-title { color: var(--cream); font-weight: 500; }
.term-body .paper-meta { color: var(--text-muted); }
.term-body .paper-journal { color: var(--gold-muted); }
.term-body .doi { color: #6fb3e0; }
.term-body .sep-line { color: var(--gold-muted); opacity: 0.5; }
.term-body .warn { color: #f2c56a; }
.term-body .num { color: var(--gold-bright); }
.term-body .key { color: var(--gold-muted); }
.term-body .url { color: #6fb3e0; text-decoration: underline; }
.term-body .agent { color: #c5a3e0; }

.replay-btn {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(10, 13, 24, 0.8);
  color: var(--gold);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 8px 17px;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0;
  backdrop-filter: blur(6px);
}
.replay-btn.show { opacity: 1; }
.replay-btn:hover {
  background: rgba(232, 184, 76, 0.14);
  color: var(--gold-bright);
}

/* CODE BLOCKS */
.code-block {
  position: relative;
  max-width: 720px;
  margin: 0 auto 16px;
}
.code-block pre {
  background: var(--terminal-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin: 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.65;
  color: var(--cream);
}
.copy-btn {
  position: absolute;
  top: 13px;
  right: 13px;
  background: rgba(232, 184, 76, 0.1);
  color: var(--gold);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.18s ease;
  letter-spacing: 0.04em;
}
.copy-btn:hover {
  background: rgba(232, 184, 76, 0.22);
  color: var(--gold-bright);
  border-color: var(--border-strong);
}
.copy-btn.copied {
  color: var(--success);
  border-color: rgba(155, 214, 138, 0.5);
  background: rgba(155, 214, 138, 0.12);
}
.install-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 720px;
  margin: 22px auto 0;
  line-height: 1.55;
}
.install-note code {
  font-family: var(--font-mono);
  background: rgba(232, 184, 76, 0.08);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--gold);
  font-size: 0.9em;
}

/* FOOTER */
.footer {
  max-width: var(--max-w);
  margin: 60px auto 0;
  padding: 40px 24px 60px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 1rem;
}
.footer a {
  color: var(--cream-dim);
  text-decoration: none;
  transition: color 0.18s ease;
}
.footer a:hover { color: var(--gold-bright); }
.footer .sep { margin: 0 12px; color: var(--gold-muted); }
.footer .imprint {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  font-size: 1.4rem;
  margin: 16px 0 0;
  color: var(--cream-dim);
}

/* RESPONSIVE */
@media (max-width: 640px) {
  body { font-size: 17.5px; }
  .nav-links { gap: 14px; font-size: 0.92rem; }
  .hero { padding: 16px 16px 56px; }
  .hero-art { margin-bottom: 32px; }
  .section { padding: 48px 16px; }
  .terminal { font-size: 13.5px; }
  .term-body { padding: 16px 18px; height: 680px; }
  .demo-tabs { gap: 4px; }
  .demo-tab { font-size: 12.5px; padding: 9px 12px; }
  .code-block pre { padding: 20px 22px; font-size: 13.5px; }
  .cta { padding: 12px 22px; font-size: 0.98rem; }
  .footer .sep { margin: 0 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .cta-primary:hover,
  .pillar:hover { transform: none; }
}