:root {
  color-scheme: light;
  --bg: #fcfcfb;
  --bg-alt: #f3f2f8;
  --card: #ffffff;
  --border: #e4e2ec;
  --grid: #e9e8e4;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #6b6a66;
  --brand: #6250d6;
  --brand-strong: #4a3aa7;
  --brand-soft: #ece9fb;
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --series-4: #eda100;
  --ok: #008300;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 8px 24px rgb(40 30 90 / 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --bg: #121211;
    --bg-alt: #1a1a19;
    --card: #1f1f1e;
    --border: #33322f;
    --grid: #2c2c2a;
    --text-primary: #f0efec;
    --text-secondary: #c3c2b7;
    --text-muted: #a6a59d;
    --brand: #9085e9;
    --brand-strong: #b3abf2;
    --brand-soft: #2a2648;
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --ok: #4cb84c;
    --shadow: none;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121211;
  --bg-alt: #1a1a19;
  --card: #1f1f1e;
  --border: #33322f;
  --grid: #2c2c2a;
  --text-primary: #f0efec;
  --text-secondary: #c3c2b7;
  --text-muted: #a6a59d;
  --brand: #9085e9;
  --brand-strong: #b3abf2;
  --brand-soft: #2a2648;
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-4: #c98500;
  --ok: #4cb84c;
  --shadow: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand-strong); }
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.92em; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5rem; letter-spacing: -0.015em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
h3 { font-size: 1.1rem; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--text-muted); }
.accent { color: var(--brand); }

.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text-primary); text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 30px; height: 30px; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 0.8rem; font-weight: 700;
}
.nav nav { display: flex; gap: 20px; margin-left: auto; }
.nav nav a { color: var(--text-secondary); text-decoration: none; font-size: 0.93rem; }
.nav nav a:hover { color: var(--text-primary); }
.theme-toggle {
  border: 1px solid var(--border); background: var(--card); color: var(--text-primary);
  border-radius: 8px; width: 34px; height: 34px; cursor: pointer; font-size: 1rem;
}

.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(900px 400px at 85% -10%, var(--brand-soft), transparent 70%),
    radial-gradient(600px 300px at 0% 0%, color-mix(in srgb, var(--series-1) 10%, transparent), transparent 70%);
}
.hero h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); max-width: 16ch; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; font-weight: 600;
  color: var(--brand-strong); margin: 0 0 12px;
}
.lede { font-size: 1.2rem; color: var(--text-secondary); max-width: 60ch; margin: 20px 0 32px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600;
  text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-strong); }
.btn-ghost { border-color: var(--border); color: var(--text-primary); background: var(--card); }

.stats { padding: 0 0 24px; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow);
}
.stat-label { font-size: 0.88rem; color: var(--text-secondary); margin: 0 0 6px; }
.stat-value { font-size: 2.1rem; font-weight: 650; margin: 0; letter-spacing: -0.02em; }
.stat.hero-stat .stat-value { font-size: 3.2rem; color: var(--brand); }
.stat-sub { font-size: 0.82rem; color: var(--text-muted); margin: 4px 0 0; }

.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); }
.section-lede { color: var(--text-secondary); font-size: 1.08rem; max-width: 64ch; margin: 0 0 36px; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.chart-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; }
.chart-card { margin: 0; padding: 24px; }
.chart-card figcaption p { margin: 0 0 12px; font-size: 0.9rem; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart text { font-size: 12px; fill: var(--text-secondary); }
.chart .value-label { fill: var(--text-primary); font-weight: 600; }
.chart .gridline { stroke: var(--grid); stroke-width: 1; }
.chart .hit { fill: transparent; cursor: default; }
.chart .mark { transition: opacity 120ms; }
.chart.hovering .mark:not(.active) { opacity: 0.45; }

.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-bottom: 8px; font-size: 0.85rem; color: var(--text-secondary); }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

.table-view { margin-top: 12px; font-size: 0.88rem; color: var(--text-secondary); }
.table-view summary { cursor: pointer; color: var(--brand-strong); }
.table-view table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.table-view th, .table-view td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--grid); }
.table-view td.num, .table-view th.num { text-align: right; font-variant-numeric: tabular-nums; }

.footnote { font-size: 0.82rem; color: var(--text-muted); margin-top: 16px; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.use-case { padding: 26px; }
.use-case p { color: var(--text-secondary); margin: 0 0 14px; }
.use-case .icon {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); margin-bottom: 16px; font-size: 1.1rem;
}
.tag {
  display: inline-block; font-size: 0.78rem !important; font-weight: 600; padding: 3px 10px;
  border-radius: 99px; border: 1px solid var(--border); color: var(--text-secondary) !important; margin: 0 !important;
}

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.callout {
  border-left: 3px solid var(--brand); padding: 12px 18px; background: var(--brand-soft);
  border-radius: 0 10px 10px 0; color: var(--text-primary); margin: 0;
}
.control-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.control-list li {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px;
  display: grid; gap: 2px; position: relative; padding-left: 46px;
}
.control-list li::before {
  content: "✓"; position: absolute; left: 16px; top: 14px; color: var(--ok); font-weight: 700;
}
.control-list span { color: var(--text-secondary); font-size: 0.93rem; }

.path-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.path { padding: 28px; position: relative; }
.path.featured { border-color: var(--brand); }
.path-letter {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin: 0 0 16px;
  font-weight: 700; font-size: 1.2rem; background: var(--brand); color: #fff;
}
.path p { color: var(--text-secondary); }
.path ul { padding-left: 18px; margin: 0; color: var(--text-secondary); font-size: 0.93rem; }
.path li { margin: 4px 0; }
.cost-note { margin-top: 20px; padding: 20px 24px; display: flex; gap: 32px; flex-wrap: wrap; align-items: center; }
.cost-note p { margin: 0; color: var(--text-secondary); }
.cost-note strong { color: var(--text-primary); font-size: 1.4rem; display: block; }

.terminal {
  margin: 0; padding: 24px; border-radius: var(--radius); background: #121218; color: #e8e6f5;
  font-size: 0.9rem; line-height: 1.6; overflow-x: auto; border: 1px solid #2b2840;
}
.terminal .muted { color: #8f8ca8; }
.terminal .ok { color: #4cd07a; }

.cta-band { text-align: center; background: linear-gradient(135deg, var(--brand-soft), var(--bg-alt)); }
.cta-band .section-lede { margin: 0 auto 32px; }
.channel-grid { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.channel {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 22px;
  display: grid; gap: 2px; min-width: 260px; font-size: 0.95rem;
}
.channel .muted { font-size: 0.8rem; }

.footer { padding: 32px 0 48px; border-top: 1px solid var(--border); font-size: 0.88rem; }
.footer p { margin: 4px 0; }

.tooltip {
  position: fixed; z-index: 50; pointer-events: none; background: var(--card); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 0.85rem;
  box-shadow: 0 6px 20px rgb(0 0 0 / 0.15); min-width: 140px;
}
.tooltip .tt-title { font-weight: 600; margin-bottom: 4px; }
.tooltip .tt-row { display: flex; align-items: center; gap: 8px; justify-content: space-between; }
.tooltip .tt-row span:first-child { display: inline-flex; align-items: center; gap: 6px; color: var(--text-secondary); }

@media (max-width: 900px) {
  .nav nav { display: none; }
  .theme-toggle { margin-left: auto; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .chart-grid, .split, .card-grid, .path-grid { grid-template-columns: 1fr; }
}