:root {
  --bg-main: #f8fafc;
  --bg-panel: #ffffff;
  --bg-alt: #f1f5f9;
  
  --text-main: #0f172a;
  --text-dim: #475569;
  --text-light: #64748b;
  
  --border: #cbd5e1;
  --border-focus: #94a3b8;
  
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  
  --buy: #059669;
  --buy-dim: rgba(5, 150, 105, 0.12);
  --sell: #dc2626;
  --sell-dim: rgba(220, 38, 38, 0.12);
  
  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --terminal-bg: #1e293b;
  --terminal-text: #f8fafc;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}
.brand-icon {
  color: var(--primary);
}
.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover {
  color: var(--text-main);
  text-decoration: none;
}
.nav-btn {
  background: var(--bg-alt);
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-main) !important;
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.nav-btn:hover {
  background: var(--border);
}

/* View Switching */
.view-active { display: block; }
.view-hidden { display: none; }

/* Hero */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-content {
  /* strictly left column */
  order: 0;
}
.hero-visual {
  /* strictly right column */
  order: 1;
}
.hero-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 3.5rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  max-width: 480px;
}
.disclaimer-alert {
  background-color: rgba(245, 158, 11, 0.1);
  border-left: 4px solid #f59e0b;
  padding: 12px 16px;
  font-size: 0.9rem;
  color: #92400e;
  margin-bottom: 32px;
  border-radius: 0 4px 4px 0;
  max-width: 480px;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 40px;
}
.stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn-primary {
  background: var(--primary);
  color: white !important;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  transition: background 0.2s;
  text-decoration: none;
  font-size: 0.95rem;
}
.btn-primary:hover {
  background: var(--primary-hover);
  text-decoration: none;
}
.btn-ghost {
  background: transparent;
  color: var(--text-main) !important;
  border: 1px solid var(--border);
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.2s;
  font-size: 0.95rem;
  text-decoration: none;
}
.btn-ghost:hover {
  background: var(--bg-alt);
  text-decoration: none;
}
.ticker-preview {
  background: var(--terminal-bg);
  border-radius: 12px;
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  height: 360px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  border: 1px solid rgba(255,255,255,0.1);
}
.ticker-preview::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(transparent, var(--terminal-bg));
}
.ticker-line {
  color: var(--text-dim);
  margin-bottom: 6px;
  white-space: nowrap;
}
.t-buy { color: var(--buy); }
.t-sell { color: var(--sell); }
.t-fill { color: var(--primary); font-weight: 600; }

/* Sections */
.section {
  padding: 80px 24px;
  border-top: 1px solid var(--border);
}
.section-alt {
  background: var(--bg-alt);
}
.container {
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  margin-bottom: 48px;
  max-width: 600px;
}
.section-header h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}
.section-header p {
  color: var(--text-dim);
  font-size: 1.1rem;
}

/* Panels */
.demo-grid {
  display: grid;
  grid-template-columns: 320px 1fr 1fr;
  gap: 24px;
}
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}
.panel-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.panel-icon {
  color: var(--primary);
}
.panel-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}
.panel-badge {
  margin-left: auto;
  font-size: 0.7rem;
  background: var(--buy-dim);
  color: var(--buy);
  padding: 2px 8px;
  border-radius: 100px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* Forms */
.order-form { display: flex; flex-direction: column; gap: 16px; }
.side-toggle { display: flex; gap: 8px; }
.side-btn {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.side-btn.active#buyBtn { background: var(--buy); border-color: var(--buy); color: white; }
.side-btn.active#sellBtn { background: var(--sell); border-color: var(--sell); color: white; }
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 0.85rem; color: var(--text-dim); font-weight: 500; }
.form-row input {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
}
.form-row input:focus {
  outline: none;
  border-color: var(--primary);
}
.submit-btn {
  background: var(--text-main);
  color: var(--bg-main);
  border: none;
  padding: 12px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 8px;
}
.submit-btn:hover { opacity: 0.9; }
.cancel-all-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 12px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}
.cancel-all-btn:hover { background: var(--bg-alt); color: var(--text-main); }
.sim-controls { display: flex; flex-direction: column; gap: 16px; }
.sim-btn {
  background: var(--primary-hover);
  color: white;
  border: none;
  padding: 12px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}
.sim-btn.active { background: var(--sell); }

/* Book Ladder */
.book-container { font-family: var(--font-mono); font-size: 0.85rem; }
.book-header-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  color: var(--text-dim);
  font-size: 0.75rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
  text-align: center;
}
.book-ladder { display: flex; flex-direction: column; gap: 2px; }
.book-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  text-align: center;
  padding: 4px 0;
  position: relative;
}
.book-row span { position: relative; z-index: 2; }
.bg-bar-buy, .bg-bar-sell {
  position: absolute;
  top: 0; bottom: 0;
  z-index: 1;
}
.bg-bar-buy { right: 66%; background: var(--buy-dim); }
.bg-bar-sell { left: 66%; background: var(--sell-dim); }
.price-col { color: var(--text-main); font-weight: 600; }
.buy-qty { color: var(--buy); }
.sell-qty { color: var(--sell); }
.spread-info {
  text-align: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Tape */
.exec-tape {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  height: 480px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tape-entry {
  padding: 8px;
  border-radius: 4px;
  background: var(--bg-alt);
  border-left: 3px solid transparent;
}
.tape-entry.t-fill { border-left-color: var(--primary); background: rgba(59, 130, 246, 0.05); }

/* Memory */
.memory-grid { display: grid; grid-template-columns: 300px 1fr; gap: 24px; }
.mem-stats { margin-bottom: 32px; }
.mem-bar-wrap { margin-bottom: 24px; }
.mem-bar-label { display: flex; justify-content: space-between; font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; }
.mem-bar { background: var(--bg-alt); height: 8px; border-radius: 4px; overflow: hidden; }
.mem-bar-fill { background: var(--primary); height: 100%; width: 0%; transition: width 0.2s; }
.mem-numbers { display: flex; flex-direction: column; gap: 16px; }
.mem-num { display: flex; flex-direction: column; }
.mem-num span { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 600; }
.mem-num label { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.mem-subtitle { font-size: 0.85rem; font-weight: 600; margin-bottom: 12px; }
.freelist-visual {
  display: flex; gap: 8px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.8rem;
}
.freelist-box {
  background: var(--bg-alt); border: 1px solid var(--border); padding: 4px 8px; border-radius: 4px;
  color: var(--text-dim);
}
.freelist-box.head { background: var(--primary); color: white; border-color: var(--primary); font-weight: 600; }
.slots-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(60px, 1fr)); gap: 8px; margin-bottom: 16px; }
.slot-box {
  background: var(--bg-main); border: 1px solid var(--border-focus); border-radius: 4px;
  height: 60px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-dim); transition: all 0.2s;
  font-weight: 500;
}
.slot-box.used { background: var(--bg-panel); border: 2px solid var(--primary); color: var(--primary); font-weight: 700; }
.slot-box small { font-size: 0.65rem; color: var(--text-dim); font-weight: 400; line-height: 1; }
.pool-info { font-size: 0.85rem; color: var(--text-dim); line-height: 1.6; }

/* Nodes */
.node-table-wrap { overflow-x: auto; margin-bottom: 24px; }
.node-table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 0.85rem; }
.node-table th { text-align: left; padding: 12px; border-bottom: 2px solid var(--border); color: var(--text-dim); font-size: 0.75rem; text-transform: uppercase; }
.node-table td { padding: 12px; border-bottom: 1px solid var(--border); }
.node-empty { padding: 24px; text-align: center; color: var(--text-dim); font-size: 0.9rem; }
.chain-viz { display: flex; flex-direction: column; gap: 16px; margin-top: 16px; }
.chain-level { display: flex; align-items: center; gap: 12px; overflow-x: auto; padding-bottom: 8px; }
.chain-price {
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600; padding: 4px 8px; border-radius: 4px;
}
.chain-price.b { background: var(--buy-dim); color: var(--buy); }
.chain-price.s { background: var(--sell-dim); color: var(--sell); }
.chain-node {
  background: var(--bg-alt); border: 1px solid var(--border); padding: 8px 12px; border-radius: 6px;
  font-family: var(--font-mono); font-size: 0.75rem; white-space: nowrap; display: flex; flex-direction: column; gap: 4px;
}
.chain-node strong { color: var(--text-main); font-size: 0.85rem; }
.chain-arrow { color: var(--border-focus); font-weight: bold; }

/* Docs View */
.docs-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  min-height: calc(100vh - 60px);
}
.docs-sidebar {
  width: 280px;
  border-right: 1px solid var(--border);
  padding: 32px 24px;
  background: var(--bg-panel);
}
.docs-sidebar h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.docs-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.docs-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: background 0.15s;
}
.docs-nav a:hover, .docs-nav a.active {
  background: var(--bg-alt);
  color: var(--primary);
  text-decoration: none;
}
.docs-content {
  flex: 1;
  padding: 40px 60px;
  background: var(--bg-main);
  overflow-y: auto;
}
.markdown-body {
  max-width: 800px;
  background: var(--bg-panel);
  padding: 40px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
  color: var(--text-main);
}
.markdown-body h1 { font-size: 2.2rem; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 1.6rem; margin-top: 32px; margin-bottom: 16px; }
.markdown-body h3 { font-size: 1.2rem; margin-top: 24px; margin-bottom: 12px; }
.markdown-body p { margin-bottom: 16px; line-height: 1.7; }
.markdown-body code { font-family: var(--font-mono); background: var(--bg-alt); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }
.markdown-body pre { background: var(--terminal-bg); color: var(--terminal-text); padding: 16px; border-radius: 8px; overflow-x: auto; margin-bottom: 20px; }
.markdown-body pre code { background: transparent; padding: 0; color: inherit; }
.markdown-body ul, .markdown-body ol { margin-bottom: 16px; padding-left: 24px; }
.markdown-body li { margin-bottom: 8px; line-height: 1.6; }
.loading-state { text-align: center; color: var(--text-dim); font-style: italic; padding: 40px; }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  background: var(--bg-panel);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.footer-brand {
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}
.footer-links {
  display: flex;
  gap: 24px;
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 48px 24px;
  }
  .hero-content { order: 0; }
  .hero-visual { order: 1; }
  .hero h1 { font-size: 2.5rem; }
  .hero-stats { flex-wrap: wrap; gap: 20px; }
  .demo-grid { grid-template-columns: 1fr; }
  .memory-grid { grid-template-columns: 1fr; }
  .docs-container { flex-direction: column; }
  .docs-sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 20px 24px; }
  .docs-nav { flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .docs-nav li a { padding: 6px 10px; font-size: 0.85rem; }
  .docs-content { padding: 24px 16px; }
  .markdown-body { padding: 24px; }
  .nav-links a:not(.nav-btn):nth-child(3) { display: none; }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 16px; }
  .stat-num { font-size: 1.2rem; }
  .hero-cta { flex-direction: column; }
  .btn-primary, .btn-ghost { text-align: center; }
  .nav-links { gap: 12px; }
  .section { padding: 48px 16px; }
}