:root {
  color-scheme: light;
  --accent: #19323c;
  --accent-2: #315d63;
  --accent-soft: #dce8e6;
  --bg: #f4efe7;
  --bg-deep: #ebe3d6;
  --ink: #1d2430;
  --muted: #6c7380;
  --line: #d8cfbe;
  --panel: rgba(255, 250, 243, 0.92);
  --panel-strong: #fff9f1;
  --good: #2b6f52;
  --warn: #b36a12;
  --new: #5e4ca4;
  --renamed: #315d63;
  --evolved: #9a5a15;
  --circle: #7d455f;
  --radius: 22px;
  --shadow: 0 18px 40px rgba(25, 50, 60, 0.08);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --accent: #b9d8d3;
  --accent-2: #8fc1bb;
  --accent-soft: #244045;
  --bg: #152228;
  --bg-deep: #101a1f;
  --ink: #f3eee5;
  --muted: #b6b9bb;
  --line: #405156;
  --panel: rgba(28, 42, 47, 0.94);
  --panel-strong: #203238;
  --good: #82c6a4;
  --warn: #e0aa66;
  --new: #b4a2ee;
  --renamed: #91c6c3;
  --evolved: #e0aa66;
  --circle: #d99ab4;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 20px; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 9% 5%, color-mix(in srgb, var(--accent-soft) 68%, transparent), transparent 30rem),
    radial-gradient(circle at 90% 25%, color-mix(in srgb, var(--panel-strong) 65%, transparent), transparent 30rem),
    var(--bg);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.55;
  transition: background-color 180ms ease, color 180ms ease;
}

a { color: inherit; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 70%, white);
  outline-offset: 3px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 50;
  transform: translateY(-180%);
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--panel-strong);
  background: var(--accent);
  font-family: var(--sans);
}
.skip-link:focus { transform: none; }
.site-shell { width: min(1420px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 30px; }
.panel {
  border: 1px solid color-mix(in srgb, var(--line) 84%, transparent);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero { padding: clamp(20px, 4vw, 58px); border-radius: 30px; overflow: hidden; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.wordmark { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-family: var(--sans); font-weight: 760; letter-spacing: -0.02em; }
.wordmark-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--panel-strong);
  background: var(--accent);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.topbar-tools { display: flex; align-items: center; gap: 9px; }
.global-search {
  min-width: min(330px, 36vw);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-strong);
  font-family: var(--sans);
}
.global-search input { width: 100%; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 14px; }
.global-search input::placeholder { color: var(--muted); }
.global-search kbd { padding: 1px 7px 2px; border: 1px solid var(--line); border-radius: 6px; color: var(--muted); font: 12px var(--sans); }
.search-icon { color: var(--muted); font-size: 20px; line-height: 1; }
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: var(--panel-strong);
  cursor: pointer;
  font: 700 13px var(--sans);
}

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.75fr) minmax(280px, 0.72fr); gap: clamp(36px, 7vw, 104px); align-items: end; padding: clamp(70px, 9vw, 126px) 0 64px; }
.eyebrow, .section-number, .note-kicker {
  margin: 0 0 16px;
  color: var(--accent-2);
  font: 800 12px/1.2 var(--sans);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { max-width: 820px; margin: 0; font-size: clamp(52px, 7.4vw, 108px); font-weight: 400; line-height: 0.94; letter-spacing: -0.062em; }
h1 em { color: var(--accent-2); font-weight: 400; }
.lede { max-width: 760px; margin: 30px 0 0; color: var(--muted); font-size: clamp(18px, 2vw, 24px); line-height: 1.5; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  font: 760 14px var(--sans);
}
.button-primary { color: var(--panel-strong); background: var(--accent); }
.button-secondary { color: var(--accent); background: transparent; }
.hero-note { padding: 28px 28px 24px; border-left: 2px solid var(--accent); background: color-mix(in srgb, var(--accent-soft) 54%, transparent); }
.hero-note p { margin: 0 0 15px; }
.hero-note .note-small { margin-bottom: 0; color: var(--muted); font: 13px/1.5 var(--sans); }
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.stat-row > div { padding: 28px 20px 0; border-left: 1px solid var(--line); }
.stat-row > div:first-child { padding-left: 0; border-left: 0; }
.stat-row strong { display: block; font-size: clamp(28px, 3vw, 46px); font-weight: 400; line-height: 1; }
.stat-row span { display: block; margin-top: 8px; color: var(--muted); font: 700 12px var(--sans); text-transform: uppercase; letter-spacing: 0.08em; }

.section { padding: clamp(72px, 10vw, 142px) clamp(0px, 2.5vw, 36px) 0; }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.7fr); gap: 38px; align-items: end; margin-bottom: 40px; }
.section-heading h2, .decoder-hero h2 { margin: 0; font-size: clamp(42px, 6vw, 76px); font-weight: 400; line-height: 0.98; letter-spacing: -0.045em; }
.section-heading > p { max-width: 560px; margin: 0; color: var(--muted); font-size: 19px; }
.compact-heading { grid-template-columns: minmax(0, 0.85fr) minmax(280px, 1fr); }
.compact-heading h2 { font-size: clamp(38px, 4.5vw, 62px); }

.cornerstone-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cornerstone-card, .term-card, .meaning-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
}
.cornerstone-card { min-height: 252px; padding: 25px; }
.cornerstone-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 5px; border-radius: 18px 18px 0 0; background: var(--accent); }
.cornerstone-card .card-number { color: var(--muted); font: 700 12px var(--sans); }
.cornerstone-card h3 { margin: 54px 0 4px; font-size: 28px; font-weight: 400; line-height: 1; }
.cornerstone-card .expansion { margin: 0 0 16px; color: var(--accent-2); font: 750 12px var(--sans); }
.cornerstone-card p:last-child { margin: 0; color: var(--muted); }

.filter-panel { position: sticky; top: 12px; z-index: 10; padding: 16px 18px; margin-bottom: 34px; }
.filter-row { display: flex; align-items: center; gap: 14px; }
.filter-label { color: var(--muted); font: 750 12px var(--sans); text-transform: uppercase; letter-spacing: 0.09em; }
.segmented { display: flex; flex-wrap: wrap; gap: 7px; }
.segmented button {
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font: 700 12px var(--sans);
}
.segmented button[aria-pressed="true"] { color: var(--panel-strong); border-color: var(--accent); background: var(--accent); }
.result-count { margin: 0 0 0 auto; color: var(--muted); white-space: nowrap; font: 700 12px var(--sans); }
.category-nav, .decoder-nav { display: flex; gap: 7px; overflow-x: auto; scrollbar-width: thin; }
.category-nav { padding-top: 14px; margin-top: 14px; border-top: 1px solid var(--line); }
.category-nav a, .decoder-nav a {
  flex: 0 0 auto;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font: 700 11px var(--sans);
}
.category-nav a:hover, .decoder-nav a:hover { color: var(--accent); border-color: var(--accent); }

.category-section { display: grid; grid-template-columns: minmax(220px, 0.37fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 92px); padding: 70px 0; border-top: 1px solid var(--line); }
.category-section:first-child { border-top: 0; }
.category-intro { position: sticky; top: 160px; align-self: start; }
.category-index { margin: 0 0 20px; color: var(--accent-2); font: 800 12px var(--sans); letter-spacing: 0.12em; text-transform: uppercase; }
.category-intro h3 { margin: 0; font-size: clamp(29px, 3.3vw, 46px); font-weight: 400; line-height: 1.04; letter-spacing: -0.035em; }
.category-intro > p:last-child { color: var(--muted); }
.term-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.term-card { padding: 22px 22px 20px; scroll-margin-top: 180px; }
.term-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 15px; }
.term-card h4 { margin: 0; font-size: 23px; font-weight: 400; line-height: 1.1; }
.status-pill, .shift-pill {
  flex: 0 0 auto;
  padding: 5px 8px;
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  font: 800 9px var(--sans);
  letter-spacing: 0.055em;
  text-transform: uppercase;
}
.status-pill.established { color: var(--good); background: color-mix(in srgb, var(--good) 13%, transparent); }
.status-pill.new-ai-era { color: var(--new); background: color-mix(in srgb, var(--new) 13%, transparent); }
.term-card .expansion { min-height: 19px; margin: 8px 0 19px; color: var(--accent-2); font: 720 12px var(--sans); }
.term-card .definition { margin: 0; color: var(--muted); }
.empty-state { padding: 50px; text-align: center; }
.empty-state h3 { margin: 0 0 24px; font-size: 30px; font-weight: 400; }

.decoder-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(290px, 0.7fr); gap: 50px; padding: clamp(30px, 5vw, 62px); }
.decoder-hero .lede { font-size: 19px; }
.shift-legend { display: grid; gap: 12px; align-content: center; }
.legend-item { display: grid; grid-template-columns: 86px 1fr; gap: 12px; align-items: center; }
.legend-item p { margin: 0; color: var(--muted); font: 13px/1.4 var(--sans); }
.shift-pill.renamed { color: var(--renamed); background: color-mix(in srgb, var(--renamed) 14%, transparent); }
.shift-pill.evolved { color: var(--evolved); background: color-mix(in srgb, var(--evolved) 14%, transparent); }
.shift-pill.full-circle { color: var(--circle); background: color-mix(in srgb, var(--circle) 14%, transparent); }
.shift-pill.new { color: var(--new); background: color-mix(in srgb, var(--new) 14%, transparent); }
.decoder-nav { margin: 20px 0 44px; padding: 0 8px 8px; }
.decoder-area { display: grid; grid-template-columns: minmax(200px, 0.33fr) minmax(0, 1fr); gap: clamp(30px, 6vw, 80px); padding: 58px 0; border-top: 1px solid var(--line); }
.decoder-area-intro h3 { margin: 0; font-size: clamp(28px, 3vw, 40px); font-weight: 400; line-height: 1.05; }
.decoder-list { display: grid; gap: 10px; }
.decoder-card { display: grid; grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr); gap: 18px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel-strong); }
.era-label { margin: 0 0 7px; color: var(--muted); font: 800 9px var(--sans); text-transform: uppercase; letter-spacing: 0.12em; }
.era-term { margin: 0; font-size: 18px; line-height: 1.25; }
.decoder-arrow { display: grid; place-items: center; color: var(--accent-2); font-size: 20px; }
.decoder-explanation { grid-column: 1 / -1; display: flex; align-items: flex-start; gap: 12px; padding-top: 16px; border-top: 1px solid var(--line); }
.decoder-explanation p { margin: 0; color: var(--muted); font-size: 15px; }

.meaning-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.meaning-card { padding: 25px; }
.meaning-card h3 { margin: 0 0 22px; font-size: 28px; font-weight: 400; }
.meaning-split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.meaning-split > div { padding-left: 14px; border-left: 2px solid var(--accent-soft); }
.meaning-split > div:last-child { border-color: color-mix(in srgb, var(--warn) 42%, var(--line)); }
.meaning-split p { margin: 0; color: var(--muted); }
.meaning-label { display: block; margin-bottom: 8px; color: var(--accent-2); font: 800 10px var(--sans); text-transform: uppercase; letter-spacing: 0.11em; }

.site-footer { display: grid; grid-template-columns: 1fr 1fr auto; gap: 40px; align-items: end; margin-top: clamp(80px, 12vw, 160px); padding: 28px; }
.site-footer p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.site-footer > p { font-family: var(--sans); }
.site-footer > a { color: var(--accent); font: 750 13px var(--sans); }

[hidden] { display: none !important; }
@media (hover: hover) {
  .cornerstone-card, .term-card, .meaning-card, .decoder-card { transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease; }
  .cornerstone-card:hover, .term-card:hover, .meaning-card:hover, .decoder-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); box-shadow: 0 14px 28px rgba(25, 50, 60, 0.07); }
}

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-note { max-width: 680px; }
  .cornerstone-grid { grid-template-columns: repeat(2, 1fr); }
  .category-section, .decoder-area { grid-template-columns: 1fr; gap: 28px; }
  .category-intro { position: static; }
  .decoder-hero { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .site-shell { width: min(100% - 20px, 1420px); padding-top: 10px; }
  .hero { padding: 18px; border-radius: 22px; }
  .topbar { align-items: flex-start; }
  .topbar-tools { flex: 1; justify-content: flex-end; }
  .global-search { min-width: 0; width: min(100%, 240px); }
  .global-search kbd, .theme-label { display: none; }
  .theme-toggle { width: 44px; padding: 0; justify-content: center; }
  .hero-grid { padding: 64px 0 44px; }
  h1 { font-size: clamp(48px, 15vw, 72px); }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .stat-row > div { padding: 20px 14px; border-top: 1px solid var(--line); }
  .stat-row > div:nth-child(odd) { padding-left: 0; border-left: 0; }
  .section { padding-top: 82px; }
  .section-heading, .compact-heading { grid-template-columns: 1fr; gap: 18px; }
  .cornerstone-grid, .term-grid, .meaning-grid { grid-template-columns: 1fr; }
  .filter-panel { top: 5px; padding: 13px; }
  .filter-row { align-items: flex-start; flex-wrap: wrap; }
  .filter-label { width: 100%; }
  .result-count { margin-left: 0; }
  .category-section { padding: 50px 0; }
  .decoder-card { grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr); gap: 9px; padding: 16px; }
  .meaning-split { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; align-items: start; }
}

@media (max-width: 460px) {
  .wordmark > span:last-child { display: none; }
  .global-search { width: 100%; }
  .hero-actions .button { width: 100%; }
  .segmented { display: grid; grid-template-columns: 1fr 1fr; width: 100%; }
  .segmented button { min-height: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}