:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #edf3fb;
  --panel: rgba(255, 255, 255, 0.92);
  --text: #152235;
  --muted: #5c6d84;
  --border: #d5deea;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.1);
  --header-bg: rgba(246, 248, 251, 0.9);
  --link: #0f5bd7;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #08111d;
  --surface: #101a2b;
  --surface-strong: #152236;
  --panel: rgba(16, 26, 43, 0.92);
  --text: #ecf3fb;
  --muted: #b4c0d3;
  --border: #2c3c54;
  --shadow: 0 24px 70px rgba(2, 8, 23, 0.5);
  --header-bg: rgba(8, 17, 29, 0.9);
  --link: #93b7ff;
}

@media (prefers-color-scheme: dark) {
  body:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #08111d;
    --surface: #101a2b;
    --surface-strong: #152236;
    --panel: rgba(16, 26, 43, 0.92);
    --text: #ecf3fb;
    --muted: #b4c0d3;
    --border: #2c3c54;
    --shadow: 0 24px 70px rgba(2, 8, 23, 0.5);
    --header-bg: rgba(8, 17, 29, 0.9);
    --link: #93b7ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(180deg, var(--surface-strong) 0, var(--bg) 18rem, var(--bg) 100%);
  color: var(--text);
}

button,
select,
a {
  font: inherit;
}

a {
  color: var(--link);
}

.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  z-index: 20;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: var(--text);
  color: var(--bg);
}

.skip-link:focus {
  top: 1rem;
}

.shell {
  width: min(1280px, calc(100% - 1.5rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
}

.header-row {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1rem 0 1.2rem;
}

.eyebrow,
.section-kicker,
.card-version {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.header-copy h1 {
  margin: 0.35rem 0 0.6rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.12;
  max-width: 16ch;
}

.lede,
.section-note,
.print-note,
.hero-panel p,
.framework-card p,
.control-context {
  margin: 0;
  line-height: 1.65;
  color: var(--muted);
}

.theme-toggle,
.tab-button,
.chip,
select {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.theme-toggle {
  border-radius: 999px;
  padding: 0.8rem 1.1rem;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.page-content {
  padding: 1.5rem 0 4rem;
}

.hero-panel,
.controls-panel,
.view-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  box-shadow: var(--shadow);
  padding: 1.2rem;
}

.controls-panel,
.view-panel {
  margin-top: 1.25rem;
}

.hero-grid,
.section-heading {
  display: grid;
  gap: 1rem;
}

.hero-grid h2,
.section-heading h2,
.framework-card h2,
.control-card h2 {
  margin: 0.3rem 0 0.5rem;
  line-height: 1.18;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.stat-card {
  padding: 1rem;
  border-radius: 1rem;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  text-align: center;
}

.stat-value {
  display: block;
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
}

.stat-label {
  font-size: 0.92rem;
  color: var(--muted);
}

.tab-row,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tab-row {
  margin-bottom: 1rem;
}

.tab-button,
.chip {
  padding: 0.75rem 1rem;
  border-radius: 999px;
  cursor: pointer;
}

.tab-button.is-active,
.chip.is-active {
  background: var(--text);
  color: var(--bg);
}

.overview-grid,
.control-area-grid {
  display: grid;
  gap: 1rem;
}

.framework-card,
.control-card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 1.2rem;
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.framework-meta {
  display: grid;
  gap: 0.8rem;
  margin: 1rem 0;
}

.framework-meta div {
  padding: 0.8rem 0.9rem;
  border-radius: 0.95rem;
  background: var(--surface-strong);
  border: 1px solid var(--border);
}

.framework-meta dt {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.framework-meta dd {
  margin: 0;
  color: var(--muted);
}

.bullet-columns {
  display: grid;
  gap: 1rem;
}

.bullet-columns h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.bullet-columns ul {
  margin: 0;
  padding-left: 1.1rem;
}

.source-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 700;
  text-decoration: none;
}

.table-wrap {
  overflow-x: auto;
}

.crosswalk-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 900px;
}

.crosswalk-table th,
.crosswalk-table td {
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.crosswalk-table thead th {
  background: var(--surface-strong);
}

.crosswalk-table tbody th {
  min-width: 220px;
}

.control-selector {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

select {
  width: min(100%, 28rem);
  padding: 0.85rem 1rem;
  border-radius: 0.95rem;
}

.control-reference {
  padding: 0.95rem 1rem;
  border-radius: 0.95rem;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
}

.site-footer {
  padding: 0 0 2.5rem;
  text-align: center;
  color: var(--muted);
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--link) 60%, white);
  outline-offset: 3px;
}

@media (min-width: 760px) {
  .hero-grid,
  .section-heading,
  .bullet-columns {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }

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

@media (min-width: 1120px) {
  .overview-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media print {
  :root,
  body,
  body[data-theme="dark"] {
    color-scheme: light;
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --panel: #ffffff;
    --text: #000000;
    --muted: #2f2f2f;
    --border: #c3c3c3;
    --shadow: none;
    --header-bg: #ffffff;
    --link: #000000;
  }

  .theme-toggle,
  .controls-panel .tab-row,
  .controls-panel .chip-row,
  .print-note,
  .site-footer {
    display: none;
  }

  .site-header {
    position: static;
    border: 0;
    background: #ffffff;
  }

  .shell {
    width: 100%;
  }

  .hero-panel,
  .controls-panel,
  .view-panel,
  .framework-card,
  .control-card {
    box-shadow: none;
  }

  .crosswalk-table {
    min-width: 0;
    font-size: 0.82rem;
  }
}