:root {
  color-scheme: light;
  --ink: #102a43;
  --muted: #52606d;
  --line: #d9e2ec;
  --paper: #fffdf7;
  --panel: #ffffff;
  --teal: #0f766e;
  --amber: #b45309;
  --blue: #0369a1;
  --green-soft: #dcfce7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--blue);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 247, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.nav {
  align-items: center;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 14px 24px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.hero {
  border-bottom: 1px solid var(--line);
  padding: 82px 24px 54px;
}

.hero-inner,
.section {
  margin: 0 auto;
  max-width: 1120px;
}

.eyebrow {
  color: var(--teal);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(42px, 7vw, 78px);
  letter-spacing: 0;
  line-height: 0.96;
  margin: 0;
  max-width: 900px;
}

.lede {
  color: var(--muted);
  font-size: 21px;
  margin: 24px 0 0;
  max-width: 780px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  align-items: center;
  border: 1px solid var(--ink);
  color: var(--ink);
  display: inline-flex;
  font-weight: 800;
  min-height: 44px;
  padding: 10px 16px;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: white;
}

.section {
  padding: 56px 24px;
}

.section h2 {
  font-size: 34px;
  letter-spacing: 0;
  line-height: 1.1;
  margin: 0 0 16px;
}

.section > p {
  color: var(--muted);
  max-width: 760px;
}

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 26px;
}

.feature {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.feature h3 {
  font-size: 18px;
  margin: 0 0 8px;
}

.feature p {
  color: var(--muted);
  margin: 0;
}

.figure {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 24px 0;
  overflow: hidden;
}

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

pre {
  background: #111827;
  border-radius: 8px;
  color: #f8fafc;
  overflow-x: auto;
  padding: 18px;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
}

.metrics {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 26px 0;
}

.metric {
  background: var(--green-soft);
  border: 1px solid #86efac;
  border-radius: 8px;
  padding: 18px;
}

.metric strong {
  display: block;
  font-size: 30px;
}

.metric span {
  color: #166534;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 30px 24px;
  text-align: center;
}

.notice {
  border-left: 4px solid var(--amber);
  color: var(--muted);
  margin-top: 24px;
  max-width: 760px;
  padding-left: 16px;
}

.playground-shell {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(280px, 390px) minmax(0, 1fr);
  margin: 0 auto;
  max-width: 1240px;
  padding: 36px 24px 64px;
}

.control-panel,
.playground-output,
.viz-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.control-panel {
  align-self: start;
  padding: 18px;
  position: sticky;
  top: 78px;
}

.preset-row {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 20px;
}

.preset {
  background: #f8fafc;
  border: 1px solid var(--line);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  min-height: 40px;
}

.preset.active {
  background: var(--ink);
  color: white;
}

.sliders {
  display: grid;
  gap: 18px;
}

.slider-control {
  display: grid;
  gap: 8px;
}

.slider-control span {
  display: grid;
  gap: 2px;
}

.slider-control em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.slider-control input {
  accent-color: var(--teal);
  width: 100%;
}

.slider-control output {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  justify-self: end;
}

.toy-sequence {
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
}

.toy-sequence span {
  color: var(--muted);
}

.playground-output {
  padding: 20px;
}

.decision-band {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 20px;
  justify-content: space-between;
  padding-bottom: 20px;
}

.decision-band h2 {
  font-size: 30px;
  margin: 0 0 8px;
  overflow-wrap: anywhere;
}

.decision-band p:last-child {
  color: var(--muted);
  margin: 0;
}

.score-ring {
  align-items: center;
  aspect-ratio: 1;
  border: 10px solid var(--teal);
  border-radius: 50%;
  display: grid;
  flex: 0 0 132px;
  justify-items: center;
  padding: 16px;
  text-align: center;
}

.score-ring span {
  font-size: 34px;
  font-weight: 900;
}

.score-ring small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.grid-compact {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.viz-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.workflow-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.workflow-card {
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.workflow-card span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.workflow-card strong {
  display: block;
  line-height: 1.35;
}

.viz-panel {
  padding: 18px;
}

.viz-panel.full {
  margin-top: 18px;
}

.viz-panel h3 {
  margin: 0 0 14px;
}

.bars {
  display: grid;
  gap: 10px;
}

.bar-row {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 150px 1fr 52px;
}

.bar-row span {
  color: var(--muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.bar-row strong {
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.bar-track {
  background: #e5e7eb;
  border-radius: 999px;
  height: 12px;
  overflow: hidden;
}

.bar-fill {
  background: var(--teal);
  height: 100%;
}

.bar-fill.negative {
  background: var(--amber);
}

.action-table {
  display: grid;
  gap: 8px;
}

.action-row {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) 64px;
  padding: 9px 0;
}

.action-row span {
  overflow-wrap: anywhere;
}

.action-row span:nth-child(2) {
  color: var(--muted);
}

.action-row strong {
  text-align: right;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .grid,
  .metrics,
  .grid-compact,
  .workflow-grid,
  .viz-grid,
  .playground-shell {
    grid-template-columns: 1fr;
  }

  .control-panel {
    position: static;
  }

  .decision-band {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 56px;
  }
}