:root {
  --bg: #f4efe4;
  --surface: rgba(255, 250, 244, 0.94);
  --surface-strong: rgba(255, 252, 247, 0.98);
  --ink: #171412;
  --muted: #6a6058;
  --line: rgba(23, 20, 18, 0.1);
  --line-strong: rgba(23, 20, 18, 0.16);
  --teal: #0d7c6b;
  --teal-strong: #0b5b4f;
  --amber: #ca7d21;
  --amber-strong: #9f6217;
  --cobalt: #2359cc;
  --shadow: 0 24px 90px rgba(42, 30, 18, 0.12);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --font-display: "Sora", "Arial Black", sans-serif;
  --font-body: "Space Grotesk", "Segoe UI", sans-serif;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(13, 124, 107, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(202, 125, 33, 0.18), transparent 24%),
    linear-gradient(180deg, #fff9f0 0%, var(--bg) 100%);
}

a,
button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
}

pre,
code {
  font-family: "IBM Plex Mono", "Consolas", monospace;
}

ul,
ol {
  margin: 0;
}

.site-shell {
  width: min(1480px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 72px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-8);
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 250, 244, 0.84);
  backdrop-filter: blur(18px);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--teal) 0%, #10b79d 100%);
  color: white;
  font-family: var(--font-display);
  font-size: 1.24rem;
  font-weight: 800;
  letter-spacing: -0.05em;
}

.brand-title,
.brand-subtitle,
.hero-lede,
.section-copy,
.feature-card p,
.use-case-card p,
.step-copy p,
.track-audience,
.detail-summary,
.outcome-banner p,
.concept-card p,
.api-card p,
.performance-card p,
.faq-card p,
.metric-card p,
.theme-copy,
.matrix-row p {
  margin: 0;
}

.brand-title {
  font-weight: 700;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 0.94rem;
}

.header-actions,
.hero-actions,
.section-actions,
.chip-row,
.button-row,
.preset-row,
.focus-row,
.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: var(--space-6);
}

.sidebar {
  position: sticky;
  top: 110px;
  align-self: start;
  display: grid;
  gap: var(--space-4);
}

.sidebar-card,
.section-panel,
.feature-card,
.use-case-card,
.metric-card,
.concept-card,
.track-card,
.detail-panel,
.api-card,
.performance-card,
.matrix-row,
.roadmap-card,
.faq-card,
.playground-doc,
.playground-preview,
.debug-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.sidebar-card,
.section-panel,
.feature-card,
.use-case-card,
.metric-card,
.concept-card,
.track-card,
.detail-panel,
.api-card,
.performance-card,
.matrix-row,
.roadmap-card,
.faq-card,
.playground-doc,
.playground-preview,
.debug-rail {
  padding: 22px;
}

.compact-card {
  background: rgba(255, 248, 238, 0.98);
}

.sidebar-nav,
.detail-list,
.step-grid,
.debug-list {
  display: grid;
  gap: 10px;
}

.nav-link,
.detail-link,
.filter-chip,
.ghost-button,
.primary-button,
.preset-chip {
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.nav-link,
.detail-link,
.filter-chip,
.ghost-button,
.preset-chip {
  background: rgba(23, 20, 18, 0.06);
  color: var(--ink);
}

.nav-link,
.detail-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  text-align: left;
  border-radius: 14px;
  padding: 12px 14px;
}

.nav-link.is-active,
.detail-link.is-active,
.filter-chip.is-active,
.preset-chip.is-active {
  background: rgba(13, 124, 107, 0.14);
  color: var(--teal-strong);
}

.detail-link strong,
.detail-link span,
.detail-link small {
  display: block;
}

.detail-link span,
.detail-link small {
  color: var(--muted);
  font-size: 0.86rem;
}

.principle-list {
  display: grid;
  gap: 10px;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.55;
}

.content {
  display: grid;
  gap: var(--space-6);
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: var(--space-6);
  background:
    linear-gradient(125deg, rgba(13, 124, 107, 0.12), rgba(255, 255, 255, 0.8) 45%),
    linear-gradient(210deg, rgba(202, 125, 33, 0.12), transparent 44%);
}

.hero-copy h1,
.section-heading h2,
.feature-card h3,
.use-case-card h3,
.metric-card strong,
.concept-card h3,
.track-card h3,
.detail-panel h3,
.api-card h3,
.performance-card h3,
.roadmap-card h3,
.faq-card h3,
.playground-doc h3,
.preview-card h3,
.footer-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.05em;
  line-height: 1.04;
}

.hero-copy h1 {
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  max-width: 11ch;
}

.hero-lede,
.section-copy,
.feature-card p,
.use-case-card p,
.step-copy p,
.track-audience,
.detail-summary,
.outcome-banner p,
.concept-card p,
.api-card p,
.performance-card p,
.faq-card p,
.metric-card p,
.theme-copy,
.matrix-row p,
.recipe-copy p {
  color: var(--muted);
  line-height: 1.65;
}

.eyebrow,
.track-label,
.detail-pill,
.api-category,
.preview-kicker,
.roadmap-phase,
.matrix-label,
.metric-card span {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.metrics-grid,
.features-grid,
.use-case-grid,
.concept-grid,
.track-grid,
.api-grid,
.performance-grid,
.roadmap-grid,
.faq-grid {
  display: grid;
  gap: var(--space-4);
}

.metrics-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.48rem;
}

.metric-card p {
  margin-top: 10px;
}

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

.use-case-grid,
.concept-grid,
.faq-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.track-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: var(--space-5);
}

.track-card ul,
.concept-card ul,
.api-card ul,
.roadmap-card ul {
  margin-top: 16px;
  padding-left: 18px;
  display: grid;
  gap: 10px;
  color: var(--muted);
  line-height: 1.55;
}

.section-heading {
  display: grid;
  gap: 16px;
  margin-bottom: var(--space-5);
}

.code-block {
  margin: 0;
  padding: 16px 18px;
  border-radius: 18px;
  background: #191411;
  color: #f7f0e3;
  overflow: auto;
  white-space: pre-wrap;
}

.code-block.compact {
  font-size: 0.9rem;
}

.inline-block {
  overflow: auto;
}

.step-card {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: var(--space-4);
  padding: 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(23, 20, 18, 0.08);
}

.step-index {
  display: grid;
  place-items: center;
  width: 84px;
  height: 84px;
  border-radius: 26px;
  background: rgba(13, 124, 107, 0.14);
  color: var(--teal-strong);
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
}

.detail-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: var(--space-4);
}

.detail-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: var(--space-4);
}

.detail-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.detail-pill,
.focus-chip,
.filter-chip,
.preset-chip {
  border-radius: 999px;
  padding: 10px 14px;
}

.detail-pill {
  background: rgba(202, 125, 33, 0.14);
  color: var(--amber-strong);
}

.detail-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-5);
}

.detail-columns h4,
.recipe-copy h4 {
  margin: 0 0 10px;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.detail-columns ul,
.detail-columns ol {
  padding-left: 18px;
  display: grid;
  gap: 10px;
  color: var(--muted);
  line-height: 1.55;
}

.outcome-banner {
  margin-top: var(--space-5);
  padding: 18px;
  border-radius: 18px;
  background: rgba(13, 124, 107, 0.08);
}

.outcome-banner span {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.recipe-copy {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.preset-row {
  margin-bottom: var(--space-5);
}

.playground-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.focus-chip {
  background: rgba(23, 20, 18, 0.06);
  color: var(--ink);
}

.playground-preview-group {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: var(--space-4);
  align-items: start;
}

.playground-preview {
  min-height: 100%;
}

.preview-card {
  display: none;
  gap: var(--space-4);
}

.preview-card.is-active {
  display: grid;
}

.preview-card.is-hidden {
  display: none;
}

.preview-head {
  display: grid;
  gap: 10px;
}

.mini-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: var(--space-4);
}

.mini-metrics article,
.filter-summary,
.theme-stage {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(23, 20, 18, 0.08);
}

.mini-metrics span,
.filter-summary span {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  line-height: 1.35;
}

.mini-metrics strong,
.filter-summary strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  line-height: 1.05;
  overflow-wrap: anywhere;
}

.theme-stage {
  display: grid;
  gap: 14px;
}

.tone-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  padding: 10px 14px;
  border-radius: 999px;
  color: white;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tone-chip--teal {
  background: var(--teal);
}

.tone-chip--amber {
  background: var(--amber);
}

.tone-chip--cobalt {
  background: var(--cobalt);
}

.search-field {
  display: grid;
  gap: 8px;
}

.search-field span {
  font-size: 0.86rem;
  color: var(--muted);
}

.search-field input {
  width: 100%;
  border: 1px solid rgba(23, 20, 18, 0.12);
  border-radius: 14px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

.result-list,
.debug-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.result-list li,
.debug-list li {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(23, 20, 18, 0.08);
}

.debug-summary {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(13, 124, 107, 0.08);
}

.debug-summary span {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.debug-summary strong {
  display: block;
  margin-top: 8px;
  font-size: 1.6rem;
}

.debug-list strong {
  display: block;
  margin-bottom: 6px;
}

.debug-list span {
  color: var(--muted);
  line-height: 1.55;
}

.api-toolbar {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

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

.api-card-head {
  display: grid;
  gap: 8px;
}

.empty-state {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--line-strong);
  background: rgba(255, 255, 255, 0.64);
}

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

.matrix-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.matrix-row {
  display: grid;
  grid-template-columns: 180px repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: start;
}

.matrix-label {
  margin-bottom: 8px;
}

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

.roadmap-phase {
  margin-bottom: 8px;
}

.footer-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  background:
    linear-gradient(135deg, rgba(13, 124, 107, 0.1), rgba(255, 255, 255, 0.72)),
    rgba(255, 250, 244, 0.94);
}

.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
}

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

.ghost-button {
  background: rgba(23, 20, 18, 0.06);
  color: var(--ink);
}

.filter-chip,
.preset-chip {
  background: rgba(23, 20, 18, 0.06);
}

.primary-button:hover,
.ghost-button:hover,
.nav-link:hover,
.detail-link:hover,
.filter-chip:hover,
.preset-chip:hover {
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
}

@media (max-width: 1520px) {
  .playground-preview-group {
    grid-template-columns: 1fr;
  }

  .debug-rail {
    order: 2;
  }
}

@media (max-width: 1280px) {
  .layout,
  .hero-panel,
  .playground-grid,
  .playground-preview-group {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .metrics-grid,
  .features-grid,
  .use-case-grid,
  .concept-grid,
  .track-grid,
  .api-grid,
  .performance-grid,
  .roadmap-grid,
  .faq-grid,
  .detail-layout,
  .detail-columns,
  .matrix-row,
  .mini-metrics {
    grid-template-columns: 1fr;
  }

  .footer-panel {
    flex-direction: column;
    align-items: start;
  }
}

@media (max-width: 920px) {
  .site-shell {
    width: min(100% - 20px, 100%);
    padding-top: 16px;
  }

  .site-header {
    flex-direction: column;
    align-items: start;
    border-radius: 28px;
  }

  .header-actions {
    width: 100%;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .sidebar {
    display: none;
  }

  .sidebar.is-open {
    display: grid;
  }

  .hero-copy h1 {
    max-width: none;
  }

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

  .step-index {
    width: 72px;
    height: 72px;
  }
}