/* ============================================================
   Mathematics Codex — Design System v2.0
   Target audience: Under 15 / Over 40
   White base, friendly domain colours, clear hierarchy
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Base */
  --bg:         #ffffff; 
  --bg-soft:    #f5f6fa;
  --bg-card:    #ffffff;
  --border:     #e2e4ed;
  --shadow:     0 2px 12px rgba(0,0,0,0.07);
  --shadow-lg:  0 6px 28px rgba(0,0,0,0.10);

  /* Text */
  --text:       #1a1a2e;
  --text-sub:   #4a4a6a;
  --text-muted: #8888a8;

  /* Domain colours — each domain has a hue identity */
  --d-foundations:  #5b6af5; /* indigo   */
  --d-number:       #e05a2b; /* orange   */
  --d-algebra:      #9b3fc8; /* purple   */
  --d-geometry:     #1a9e6e; /* green    */
  --d-topology:     #0099cc; /* sky blue */
  --d-analysis:     #c72b6a; /* rose     */
  --d-probability:  #d4960a; /* amber    */
  --d-discrete:     #2b7a3a; /* forest   */
  --d-applied:      #4a85c8; /* blue     */
  --d-mathphys:     #7a3fc0; /* violet   */
  --d-history:      #b05020; /* terracotta */
  --d-named:        #c8262d; /* red      */
  --d-indian:       #d4840a; /* gold     */
  --d-recreational: #22a68a; /* teal     */

  /* Reading level colours */
  --lvl-curious:  #1a9e6e;
  --lvl-exploring:#5b6af5;
  --lvl-deep:     #9b3fc8;

  /* Source tier colours */
  --tier1: #1a9e6e;
  --tier2: #5b6af5;
  --tier3: #d4960a;

  /* Spacing */
  --radius:    12px;
  --radius-sm: 7px;
  --gap:       1.5rem;

  /* Legacy aliases — some early entries use these names in inline styles */
  --c-bg:            var(--bg-soft);
  --c-surface:       #ffffff;
  --c-border:        var(--border);
  --c-text:          var(--text);
  --c-text-muted:    var(--text-muted);
  --c-accent:        var(--d-foundations);
  --c-accent-bright: var(--d-foundations);
  --c-accent-dim:    #eef0ff;
  --c-gold:          var(--d-indian);
  --font-ui:         'Segoe UI', system-ui, sans-serif;
  --font-body:       'Segoe UI', system-ui, sans-serif;
  --font-mono:       'Courier New', monospace;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-soft);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
}

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

img { max-width: 100%; }

/* --- Layout --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================================
   NAV
   ============================================================ */
.site-nav {
  background: #fff;
  border-bottom: 2px solid var(--border);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 62px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-brand span {
  background: linear-gradient(135deg, #5b6af5, #9b3fc8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  align-items: center;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  transition: all 0.15s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
}

/* ============================================================
   HUB — LANDING PAGE
   ============================================================ */
.hub-hero {
  background: linear-gradient(135deg, #f0f2ff 0%, #fff5f0 50%, #f0fff8 100%);
  padding: 3.5rem 1.5rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hub-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.hub-hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, #5b6af5, #9b3fc8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hub-hero p {
  font-size: 1.1rem;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto 1.75rem;
}

.hub-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hub-stat {
  text-align: center;
}

.hub-stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}

.hub-stat .lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Domain grid */
.hub-section {
  padding: 2.5rem 0;
}

.hub-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.domain-card {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.25rem;
  transition: all 0.18s;
  cursor: pointer;
  display: block;
  position: relative;
  overflow: hidden;
}

.domain-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--domain-color, #5b6af5);
  border-radius: var(--radius) var(--radius) 0 0;
}

.domain-card:hover {
  border-color: var(--domain-color, #5b6af5);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}

.domain-card .icon {
  font-size: 1.75rem;
  margin-bottom: 0.6rem;
  display: block;
}

.domain-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.domain-card p {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.5;
  margin-bottom: 0.6rem;
}

.domain-card .entry-count {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--domain-color, #5b6af5);
}

/* ============================================================
   DOMAIN LANDING PAGE
   ============================================================ */
.domain-hero {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 1.5rem 2rem;
}

.domain-hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.domain-hero-icon {
  font-size: 3rem;
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, color-mix(in srgb, var(--domain-color) 12%, white), color-mix(in srgb, var(--domain-color) 6%, white));
  display: flex;
  align-items: center;
  justify-content: center;
}

.domain-hero-text h1 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.domain-hero-text p {
  color: var(--text-sub);
  font-size: 0.95rem;
  max-width: 600px;
}

/* Entry list on domain page */
.entry-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.entry-row {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.15s;
}

.entry-row:hover {
  border-color: var(--domain-color, #5b6af5);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.entry-row-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--domain-color) 12%, white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.entry-row-body { flex: 1; min-width: 0; }

.entry-row-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
}

.entry-row-summary {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.4;
  margin-top: 0.15rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.entry-row-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
  flex-shrink: 0;
}

.badge-live {
  background: #e8faf2;
  color: #1a9e6e;
  border: 1px solid #b0e8d0;
}

.badge-planned {
  background: var(--bg-soft);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.badge-type {
  background: color-mix(in srgb, var(--domain-color) 10%, white);
  color: var(--domain-color, #5b6af5);
  border: 1px solid color-mix(in srgb, var(--domain-color) 25%, white);
}

/* ============================================================
   ENTRY PAGE
   ============================================================ */
.entry-page {
  background: var(--bg-soft);
  min-height: 100vh;
  padding-bottom: 4rem;
}

/* Breadcrumb */
.breadcrumb {
  padding: 1rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover { color: var(--domain-color, #5b6af5); text-decoration: none; }

.breadcrumb .sep { color: var(--border); }

/* Entry header card */
.entry-header-card {
  background: #fff;
  border: 2px solid var(--border);
  border-top: 4px solid var(--domain-color, #5b6af5);
  border-radius: var(--radius);
  padding: 2rem;
  margin: 1rem 0;
}

.entry-type-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.22rem 0.65rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tag-type {
  background: color-mix(in srgb, var(--domain-color) 12%, white);
  color: var(--domain-color, #5b6af5);
  border: 1px solid color-mix(in srgb, var(--domain-color) 25%, white);
}

.tag-domain {
  background: var(--bg-soft);
  color: var(--text-sub);
  border: 1px solid var(--border);
}

.tag-live {
  background: #e8faf2;
  color: #1a9e6e;
  border: 1px solid #b0e8d0;
}

.entry-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 0.75rem;
  line-height: 1.15;
}

.entry-summary {
  font-size: 1rem;
  color: var(--text-sub);
  line-height: 1.7;
  border-left: 3px solid var(--domain-color, #5b6af5);
  padding-left: 1rem;
  margin-top: 0.25rem;
}

/* Reading level tabs */
.level-tabs {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  background: var(--bg-soft);
  padding: 0.4rem;
  border-radius: var(--radius);
  width: fit-content;
}

.level-tab {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.level-tab:hover {
  background: #fff;
  color: var(--text);
}

.level-tab.active {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 6px rgba(0,0,0,0.10);
}

.level-tab[data-level="curious"].active   { color: var(--lvl-curious); }
.level-tab[data-level="exploring"].active { color: var(--lvl-exploring); }
.level-tab[data-level="deep"].active      { color: var(--lvl-deep); }

/* Entry content panels */
.level-panel {
  display: none;
}

.level-panel.visible {
  display: block;
}

.content-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1rem;
}

.content-card h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.content-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin: 1.5rem 0 0.6rem;
}

.content-card h3:first-child { margin-top: 0; }

.content-card p {
  color: var(--text-sub);
  margin-bottom: 0.9rem;
  font-size: 0.97rem;
}

.content-card p:last-child { margin-bottom: 0; }

.content-card ul, .content-card ol {
  color: var(--text-sub);
  padding-left: 1.4rem;
  margin-bottom: 0.9rem;
  font-size: 0.97rem;
}

.content-card li { margin-bottom: 0.4rem; }

.content-card strong { color: var(--text); font-weight: 700; }

.content-card em { color: var(--text-sub); }

/* Math display */
.math-display {
  text-align: center;
  font-size: 1.5rem;
  font-family: 'Georgia', serif;
  font-weight: 700;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--domain-color) 8%, white),
    color-mix(in srgb, var(--domain-color) 4%, white));
  border: 2px solid color-mix(in srgb, var(--domain-color) 20%, white);
  border-radius: var(--radius);
  margin: 1rem 0;
  color: var(--text);
  letter-spacing: 0.05em;
}

/* Tables */
.content-card table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.content-card th {
  background: var(--bg-soft);
  color: var(--text-sub);
  font-weight: 600;
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 2px solid var(--border);
}

.content-card td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--bg-soft);
  color: var(--text-sub);
}

.content-card tr:last-child td { border-bottom: none; }
.content-card tr:hover td { background: var(--bg-soft); }

/* Callout / highlight box */
.callout {
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  font-size: 0.92rem;
}

.callout-info {
  background: #f0f2ff;
  border-left: 3px solid var(--d-foundations);
  color: var(--text-sub);
}

.callout-gold {
  background: #fff8e8;
  border-left: 3px solid var(--d-indian);
  color: var(--text-sub);
}

.callout-green {
  background: #f0faf5;
  border-left: 3px solid var(--d-geometry);
  color: var(--text-sub);
}

/* ============================================================
   SOURCES
   ============================================================ */
.sources-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 1rem;
}

.sources-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.source-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--bg-soft);
  align-items: flex-start;
  font-size: 0.88rem;
}

.source-item:last-child { border-bottom: none; }

.source-tier-badge {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  margin-top: 0.1rem;
}

.tier-1 { background: #e8faf2; color: var(--tier1); border: 1px solid #b0e8d0; }
.tier-2 { background: #eef0ff; color: var(--tier2); border: 1px solid #c8ccf8; }
.tier-3 { background: #fff8e8; color: var(--tier3); border: 1px solid #f0d888; }

.source-text { color: var(--text-sub); line-height: 1.5; }

/* ============================================================
   RELATIONSHIPS
   ============================================================ */
.relations-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-bottom: 1rem;
}

.relations-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.relation-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.relation-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
}

.relation-type {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  background: var(--bg-soft);
  color: var(--text-muted);
  border: 1px solid var(--border);
  white-space: nowrap;
  flex-shrink: 0;
}

.relation-item a {
  color: var(--domain-color, #5b6af5);
  font-weight: 600;
}

.relation-item a:hover { text-decoration: underline; }

.relation-item span.note {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ============================================================
   ENTRY PROVENANCE FOOTER
   ============================================================ */
.entry-provenance {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 1rem 0 0;
  flex-wrap: wrap;
}

.entry-provenance a {
  color: var(--domain-color, #5b6af5);
}

/* ============================================================
   HIDDEN (JS toggle)
   ============================================================ */
.hidden { display: none !important; }

/* ============================================================
   SITE FOOTER
   ============================================================ */
.site-footer {
  background: var(--text);
  color: rgba(255,255,255,0.6);
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  margin-top: 4rem;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-footer a { color: rgba(255,255,255,0.8); }
.site-footer a:hover { color: #fff; text-decoration: none; }

/* ============================================================
   STATUS PAGE
   ============================================================ */
.status-table { width:100%; border-collapse:collapse; font-size:0.9rem; margin-top:1.5rem; }
.status-table th { background:var(--bg-soft); color:var(--text-sub); font-weight:600; padding:0.65rem 1rem; text-align:left; border-bottom:2px solid var(--border); }
.status-table td { padding:0.65rem 1rem; border-bottom:1px solid var(--bg-soft); color:var(--text-sub); }
.status-table tr:last-child td { border-bottom:none; }
.s-live { color:#1a9e6e; font-weight:600; }
.s-pending { color:var(--text-muted); }

/* ============================================================
   GLOSSARY
   ============================================================ */
.gloss-term-title { font-weight:700; color:var(--text); font-size:1rem; }
.gloss-def { color:var(--text-sub); font-size:0.92rem; margin-top:0.2rem; line-height:1.6; }
.gloss-orig { font-style:italic; color:var(--text-muted); font-weight:400; font-size:0.88rem; }

/* ============================================================
   ALPHA NAV
   ============================================================ */
.alpha-nav { display:flex; flex-wrap:wrap; gap:0.35rem; margin:1.5rem 0; }
.alpha-nav a {
  width:34px; height:34px; display:flex; align-items:center; justify-content:center;
  background:#fff; border:1.5px solid var(--border); border-radius:7px;
  color:var(--text-sub); font-size:0.85rem; font-weight:600; transition:all 0.12s;
}
.alpha-nav a:hover { border-color:var(--d-foundations); color:var(--d-foundations); text-decoration:none; }

/* ============================================================
   FILTER BUTTONS
   ============================================================ */
.filter-row { display:flex; flex-wrap:wrap; gap:0.4rem; margin:1.5rem 0; }
.filter-btn {
  padding:0.4rem 1rem; border:1.5px solid var(--border); border-radius:20px;
  background:#fff; color:var(--text-sub); font-size:0.85rem; font-weight:500;
  cursor:pointer; transition:all 0.12s;
}
.filter-btn:hover { border-color:var(--d-foundations); color:var(--d-foundations); }
.filter-btn.active { background:var(--d-foundations); color:#fff; border-color:var(--d-foundations); }

/* ============================================================
   TIMELINE
   ============================================================ */
.tl-date { color:var(--domain-color, var(--d-foundations)); font-weight:700; font-size:0.85rem; font-family:'Courier New',monospace; flex-shrink:0; width:110px; padding-top:0.15rem; }
.tl-event { display:flex; gap:1.25rem; padding:1rem 0; border-bottom:1px solid var(--bg-soft); align-items:flex-start; }
.tl-event:last-child { border-bottom:none; }
.tl-title { font-size:0.97rem; font-weight:700; color:var(--text); margin-bottom:0.2rem; }
.tl-desc { font-size:0.86rem; color:var(--text-sub); line-height:1.55; }
.tl-tags { display:flex; flex-wrap:wrap; gap:0.3rem; margin-top:0.4rem; }
.tl-tag { font-size:0.72rem; padding:0.12rem 0.45rem; border-radius:4px; background:var(--bg-soft); color:var(--text-muted); border:1px solid var(--border); }
.tl-link { font-size:0.8rem; color:var(--d-foundations); margin-top:0.35rem; display:inline-block; font-weight:600; }

/* ============================================================
   PEOPLE CARDS
   ============================================================ */
.person-card { background:#fff; border:1.5px solid var(--border); border-radius:var(--radius); padding:1.25rem; }
.person-card h3 { font-size:0.98rem; font-weight:700; color:var(--text); margin-bottom:0.2rem; }
.person-card .dates { font-size:0.8rem; color:var(--text-muted); margin-bottom:0.4rem; }
.person-card .bio { font-size:0.86rem; color:var(--text-sub); line-height:1.55; }
.person-card .entry-link { font-size:0.82rem; color:var(--d-foundations); margin-top:0.5rem; display:inline-block; font-weight:600; }
.person-card.planned { opacity:0.6; }
.planned-note { font-size:0.75rem; color:var(--text-muted); margin-top:0.35rem; }

/* tradition colour pills on person cards */
.pill { display:inline-block; font-size:0.72rem; font-weight:600; padding:0.15rem 0.5rem; border-radius:20px; margin-bottom:0.4rem; }
.pill-indian  { background:#fff8e8; color:var(--d-indian); border:1px solid #f0d888; }
.pill-greek   { background:#eef0ff; color:var(--d-foundations); border:1px solid #c8ccf8; }
.pill-islamic { background:#f0faf5; color:var(--d-geometry); border:1px solid #b0e8d0; }
.pill-chinese { background:#fff0ee; color:var(--d-named); border:1px solid #f8c8c8; }
.pill-european{ background:#f5f0ff; color:var(--d-algebra); border:1px solid #d8c0f0; }
.pill-babylonian{background:#fff4e8; color:var(--d-probability); border:1px solid #f0d090; }

/* ============================================================
   REGIONS PAGE
   ============================================================ */
.region-card { background:#fff; border:1.5px solid var(--border); border-radius:var(--radius); padding:1.75rem; }
.region-card h2 { font-size:1.1rem; font-weight:800; margin-bottom:0.2rem; }
.region-period { font-size:0.78rem; color:var(--text-muted); margin-bottom:0.75rem; }
.region-card p { font-size:0.88rem; color:var(--text-sub); line-height:1.6; margin-bottom:0.6rem; }
.region-card ul { list-style:none; padding:0; margin:0 0 0.75rem; }
.region-card ul li { font-size:0.84rem; color:var(--text-sub); padding:0.28rem 0; border-bottom:1px solid var(--bg-soft); display:flex; gap:0.5rem; align-items:flex-start; }
.region-card ul li:last-child { border-bottom:none; }
.region-card ul li::before { content:'→'; color:var(--d-foundations); flex-shrink:0; font-weight:700; }
.region-links { display:flex; flex-wrap:wrap; gap:0.4rem; margin-top:0.5rem; }
.region-links a { font-size:0.8rem; font-weight:600; color:var(--domain-color,var(--d-foundations)); background:color-mix(in srgb,var(--domain-color,var(--d-foundations)) 8%,white); border:1px solid color-mix(in srgb,var(--domain-color,var(--d-foundations)) 20%,white); border-radius:5px; padding:0.2rem 0.55rem; }

/* ============================================================
   PAGE SECTIONS
   ============================================================ */
.page-section { padding: 2.5rem 0; }

.page-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 1.5rem 2rem;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.page-header p {
  color: var(--text-sub);
  font-size: 0.97rem;
  max-width: 600px;
}

/* Notice / info boxes */
.notice {
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  font-size: 0.9rem;
  margin: 1.5rem 0;
}

.notice-warning {
  background: #fff8e8;
  border: 1.5px solid #f0d888;
  color: var(--text-sub);
}

.notice-info {
  background: #f0f2ff;
  border: 1.5px solid #c8ccf8;
  color: var(--text-sub);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
/* ============================================================
   DOMAIN LANDING PAGE — ALTERNATE TEMPLATE
   (site header, build banner, stub notices, simple entry lists)
   ============================================================ */

.site-header {
  background: #fff;
  border-bottom: 2px solid var(--border);
  padding: 0.9rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.site-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header .site-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0;
}

.site-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.site-logo strong { font-weight: 800; }

.header-nav { display: flex; gap: 0.25rem; flex-wrap: wrap; }

.header-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  transition: all 0.15s;
}

.header-nav a:hover {
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
}

.build-banner {
  background: #fff8e8;
  border-bottom: 1px solid #f0d888;
  color: var(--text-sub);
  font-size: 0.85rem;
  text-align: center;
  padding: 0.6rem 1rem;
}

.build-banner a {
  color: var(--tier3);
  font-weight: 600;
  text-decoration: underline;
}

.stub-notice {
  background: #f0f2ff;
  border: 1.5px solid #c8ccf8;
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 1.25rem;
}

.stub-notice a {
  color: var(--c-accent-bright);
  font-weight: 600;
}

ul.entry-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

ul.entry-list li {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  transition: all 0.15s;
}

ul.entry-list li:hover {
  border-color: var(--c-accent-bright);
  box-shadow: var(--shadow);
}

ul.entry-list li a {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

ul.entry-list li a:hover {
  color: var(--c-accent-bright);
  text-decoration: none;
}

.entry-one-line {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-top: 0.3rem;
  line-height: 1.5;
}

.entry-status-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: 20px;
  margin-left: 0.6rem;
  vertical-align: middle;
}

.badge-stub {
  background: var(--bg-soft);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.footer-bottom {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}

.footer-bottom a { color: rgba(255,255,255,0.9); }
.footer-bottom a:hover { color: #fff; }

.breadcrumb ol {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: '›';
  color: var(--border);
  margin-left: 0.4rem;
}

.breadcrumb li a { color: var(--text-muted); }
.breadcrumb li a:hover { color: var(--c-accent-bright); text-decoration: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  .site-nav { gap: 1rem; }
  .nav-links { display: none; }
  .domain-grid { grid-template-columns: repeat(2, 1fr); }
  .hub-hero h1 { font-size: 1.75rem; }
  .entry-title { font-size: 1.6rem; }
  .level-tabs { flex-wrap: wrap; width: 100%; }
  .level-tab { flex: 1; justify-content: center; }
  .domain-hero-inner { flex-direction: column; }
  .tl-event { flex-direction: column; gap: 0.35rem; }
  .tl-date { width: auto; }
  .site-header .site-wrap { flex-direction: column; align-items: flex-start; }
  .header-nav { width: 100%; }
}

/* build: v2.5 | 2026-07-09 */