:root {
  --sand-1: #f4efe7;
  --sand-2: #efe1cd;
  --ink-1: #1f2430;
  --ink-2: #4c5566;
  --line: rgba(31, 36, 48, 0.12);
  --panel: rgba(255, 255, 255, 0.84);
  --warm: #c96f2d;
  --warm-2: #f59e0b;
  --cool: #22577a;
  --cool-2: #0f766e;
  --good: #216e4e;
  --bad: #b42318;
  --shadow-xl: 0 24px 64px rgba(27, 32, 47, 0.14);
  --shadow-lg: 0 18px 40px rgba(27, 32, 47, 0.1);
  --shadow-md: 0 10px 24px rgba(27, 32, 47, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink-1);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(201, 111, 45, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(34, 87, 122, 0.14), transparent 32%),
    linear-gradient(180deg, var(--sand-1), var(--sand-2));
}

a {
  color: inherit;
}

code, pre {
  font-family: "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

.page-shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 28px 22px 80px;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 32px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.88), rgba(255, 250, 242, 0.78)),
    linear-gradient(180deg, rgba(255,255,255,0.3), rgba(255,255,255,0));
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(16px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(201, 111, 45, 0.12);
  color: var(--warm);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.hero h1 {
  margin: 16px 0 14px;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hero-lede {
  max-width: 62ch;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-2);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 144px;
  padding: 12px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, var(--warm), var(--warm-2));
  color: white;
  box-shadow: 0 12px 24px rgba(201, 111, 45, 0.26);
}

.button.secondary {
  background: rgba(34, 87, 122, 0.09);
  color: var(--cool);
  border: 1px solid rgba(34, 87, 122, 0.14);
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-card,
.sidebar-note,
.panel,
.info-card,
.mini-card,
.key-card,
.ladder-card,
.decision-card,
.flow-card,
.ops-box,
.visual-card,
.example-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-md);
}

.metric-card {
  padding: 16px;
  border-radius: 18px;
}

.metric-kicker {
  display: block;
  color: var(--ink-2);
  font-size: 0.82rem;
}

.metric-value {
  display: block;
  margin-top: 8px;
  margin-bottom: 8px;
  font-size: 1.25rem;
}

.metric-card code {
  display: block;
  padding: 8px 10px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.94);
  color: #e5edf8;
  font-size: 0.85rem;
  overflow-wrap: anywhere;
}

.hero-ascii {
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero-ascii pre {
  margin: 0;
  padding: 22px;
  background:
    radial-gradient(circle at 20% 0%, rgba(245, 158, 11, 0.18), transparent 28%),
    linear-gradient(160deg, #0f172a, #142033 65%, #101726);
  color: #dbeafe;
  line-height: 1.65;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sidebar {
  position: relative;
}

.toc,
.sidebar-note {
  border-radius: 22px;
  padding: 18px 20px;
}

.toc {
  position: sticky;
  top: 18px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
}

.toc a {
  display: block;
  padding: 10px 0;
  text-decoration: none;
  font-weight: 600;
  color: var(--ink-2);
  border-bottom: 1px solid rgba(31, 36, 48, 0.08);
}

.toc a:last-child {
  border-bottom: 0;
}

.sidebar-note {
  margin-top: 18px;
}

.sidebar-title {
  margin-bottom: 10px;
  font-weight: 700;
}

.sidebar-note p {
  margin: 0;
  color: var(--ink-2);
  line-height: 1.7;
}

.content {
  display: grid;
  gap: 22px;
}

.panel {
  padding: 28px;
  border-radius: var(--radius-xl);
}

.section-head {
  margin-bottom: 18px;
}

.section-kicker {
  display: inline-flex;
  margin-bottom: 8px;
  color: var(--warm);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.panel h2 {
  margin: 0;
  font-size: clamp(1.8rem, 2.7vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.card-grid {
  display: grid;
  gap: 16px;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.mini-card,
.key-card,
.ladder-card,
.decision-card,
.flow-card,
.ops-box,
.visual-card {
  border-radius: var(--radius-lg);
  padding: 20px;
}

.info-card.accent {
  background:
    linear-gradient(180deg, rgba(34, 87, 122, 0.08), rgba(255, 255, 255, 0.86)),
    var(--panel);
}

.info-card h3,
.mini-card h3,
.key-card h3,
.ladder-card h3,
.decision-card h3,
.flow-card h3,
.ops-box .ops-title {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.clean-list {
  margin: 0;
  padding-left: 20px;
  line-height: 1.75;
  color: var(--ink-2);
}

.clean-list.compact {
  line-height: 1.55;
}

.plain-ol {
  margin: 0;
  padding-left: 20px;
  line-height: 1.75;
}

.rich-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
}

.rich-table th,
.rich-table td {
  padding: 14px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(31, 36, 48, 0.08);
}

.rich-table th {
  background: rgba(34, 87, 122, 0.07);
  font-size: 0.9rem;
}

.compact-table th,
.compact-table td {
  padding: 12px 12px;
}

.visual-card {
  padding: 8px;
}

.diagram {
  width: 100%;
  height: auto;
  display: block;
}

.svg-box {
  stroke-width: 1.5;
}

.warm-box {
  fill: rgba(249, 115, 22, 0.12);
  stroke: rgba(249, 115, 22, 0.55);
}

.cool-box {
  fill: rgba(37, 99, 235, 0.1);
  stroke: rgba(37, 99, 235, 0.42);
}

.neutral-box {
  fill: rgba(255, 255, 255, 0.78);
  stroke: rgba(31, 36, 48, 0.18);
}

.svg-label {
  font-size: 26px;
  font-weight: 700;
  fill: #1f2430;
}

.svg-code {
  font-family: "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 18px;
  fill: #1f2430;
}

.svg-sub {
  font-size: 18px;
  fill: #4c5566;
}

.svg-arrow {
  fill: none;
  stroke: #1f2430;
  stroke-width: 3;
  marker-end: url(#arrowHead);
}

.timeline {
  display: grid;
  gap: 16px;
}

.step-card {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  padding: 18px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
}

.step-index {
  display: grid;
  place-items: center;
  height: 82px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(201,111,45,0.14), rgba(245,158,11,0.22));
  color: var(--warm);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.step-body h3 {
  margin: 0 0 8px;
}

.step-body p {
  margin: 0 0 12px;
  color: var(--ink-2);
  line-height: 1.75;
}

pre {
  margin: 0;
  padding: 16px 18px;
  border-radius: 16px;
  overflow: auto;
  background:
    radial-gradient(circle at 12% 10%, rgba(245,158,11,0.14), transparent 24%),
    linear-gradient(160deg, #0f172a, #142033 65%, #101726);
  color: #e5edf8;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}

.example-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.example-tab {
  border: 1px solid rgba(31, 36, 48, 0.12);
  background: rgba(255,255,255,0.7);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  color: var(--ink-2);
}

.example-tab.is-active {
  background: linear-gradient(135deg, var(--cool), var(--cool-2));
  color: white;
  border-color: transparent;
}

.example-panel {
  display: none;
  border-radius: var(--radius-lg);
  padding: 22px;
}

.example-panel.is-active {
  display: block;
}

.example-meta {
  margin-bottom: 14px;
}

.example-meta h3 {
  margin: 0 0 8px;
}

.example-meta p {
  margin: 0;
  color: var(--ink-2);
  line-height: 1.7;
}

.kv-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.kv-list div {
  display: grid;
  gap: 4px;
}

.kv-list dt {
  font-weight: 700;
}

.kv-list dd {
  margin: 0;
  color: var(--ink-2);
}

.data-key-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.key-card {
  background:
    linear-gradient(180deg, rgba(34,87,122,0.05), rgba(255,255,255,0.84));
}

.ladder {
  display: grid;
  gap: 12px;
}

.rung {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  font-weight: 700;
}

.rung.hot {
  background: rgba(201, 111, 45, 0.16);
  color: #7c2d12;
}

.rung.medium {
  background: rgba(34, 87, 122, 0.12);
  color: #1d4ed8;
}

.rung.cool {
  background: rgba(15, 118, 110, 0.1);
  color: #0f766e;
}

.caption {
  margin: 14px 0 0;
  color: var(--ink-2);
  line-height: 1.7;
}

.flow-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.flow-list {
  display: grid;
  gap: 10px;
}

.flow-list span {
  position: relative;
  display: block;
  padding: 12px 14px 12px 44px;
  border-radius: 14px;
  background: rgba(255,255,255,0.76);
  color: var(--ink-2);
}

.flow-list span::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--warm), var(--warm-2));
  transform: translateY(-50%);
}

.state-machine {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 18px;
  overflow-x: auto;
}

.state-node,
.state-arrow {
  min-width: 120px;
  text-align: center;
}

.state-node {
  padding: 14px 18px;
  border-radius: 18px;
  font-weight: 700;
  border: 1px solid var(--line);
}

.state-idle {
  background: rgba(255,255,255,0.72);
}

.state-good {
  background: rgba(33, 110, 78, 0.12);
  color: var(--good);
}

.state-bad {
  background: rgba(180, 35, 24, 0.1);
  color: var(--bad);
}

.state-arrow {
  color: var(--ink-2);
  font-size: 0.92rem;
}

.ops-strip {
  margin-top: 16px;
}

.ops-title {
  display: block;
  margin-bottom: 10px;
}

@media (max-width: 1160px) {
  .hero,
  .layout,
  .card-grid.two,
  .card-grid.three,
  .data-key-grid,
  .flow-columns {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }

  .content {
    order: 1;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 16px 14px 48px;
  }

  .hero,
  .panel {
    padding: 20px;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .step-card {
    grid-template-columns: 1fr;
  }

  .state-machine {
    grid-template-columns: 1fr;
  }
}