:root {
  color-scheme: dark;
  --topbar-offset: 84px;
  --bg: #07111f;
  --bg-grad-1: #06101d;
  --bg-grad-2: #0b1525;
  --bg-grad-3: #0d1728;
  --panel: rgba(16, 27, 44, 0.88);
  --panel-solid: #101b2c;
  --line: #24354f;
  --text: #edf3ff;
  --muted: #9fb0ca;
  --accent: #6ee7ff;
  --accent2: #b27cff;
  --chip: rgba(255,255,255,.04);
  --chip-strong: rgba(110,231,255,.08);
  --shadow: 0 20px 60px rgba(0,0,0,.25);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f7fb;
  --bg-grad-1: #f7fbff;
  --bg-grad-2: #eef4fb;
  --bg-grad-3: #eef2f7;
  --panel: rgba(255,255,255,.92);
  --panel-solid: #ffffff;
  --line: #d5e0ec;
  --text: #132235;
  --muted: #5f738b;
  --accent: #0b6efe;
  --accent2: #7b4dff;
  --chip: rgba(11,110,254,.05);
  --chip-strong: rgba(11,110,254,.08);
  --shadow: 0 16px 40px rgba(20,40,70,.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: linear-gradient(180deg, var(--bg-grad-1), var(--bg-grad-2) 30%, var(--bg-grad-3));
  color: var(--text);
}
a { color: var(--accent); }
button, select, input { font: inherit; }
a:focus-visible, button:focus-visible, select:focus-visible, input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
}
main, .hero, .footer, .narrow { max-width: 1240px; margin: 0 auto; padding: 24px; }
.narrow { max-width: 980px; }

.topbar-shell {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 50;
  padding: 0;
}
.topbar { 
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 88%, transparent);
  backdrop-filter: blur(14px);
  border-radius: 0;
  box-shadow: 0 8px 28px rgba(0,0,0,.18);
}
.author-link {
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  font-weight: 500;
}
.topbar-nav, .theme-toggle, .badge-row, .hero-nav { display: flex; flex-wrap: wrap; gap: 10px; }
.topbar-nav { justify-content: center; row-gap: 8px; }
.theme-toggle { justify-content: flex-end; }
.topbar-nav a, .theme-button, .page-button, .hero-nav a {
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--chip);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  line-height: 1;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.theme-button.is-active { background: var(--chip-strong); border-color: var(--accent); }
.topbar-nav a:hover, .theme-button:hover, .page-button:hover {
  background: var(--chip-strong);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

body { padding-top: var(--topbar-offset); }

.hero { 
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
  min-height: calc(72vh - 100px);
  padding-top: 40px;
  padding-bottom: 36px;
}
.hero-copy { max-width: 720px; }
.hero-art { width: 100%; max-height: 380px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; color: var(--accent); font-size: .78rem; margin: 0 0 10px; }
h1, h2, h3 { line-height: 1.1; }
h1 { font-size: clamp(2.6rem, 6vw, 4.8rem); margin: .2rem 0 1rem; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); margin: 0; letter-spacing: -0.02em; }
h3 { font-size: 1.15rem; margin: 0 0 .5rem; }
.hero-copy > p:not(.eyebrow) { font-size: 1.08rem; line-height: 1.65; color: var(--muted); max-width: 60ch; }
.badge, .tag {
  border: 1px solid var(--line);
  background: var(--chip);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: .88rem;
}
.tag { display: inline-block; margin: 0 6px 6px 0; }
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.panel-inline {
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--chip);
}
.section-head { display: flex; justify-content: space-between; gap: 18px; align-items: end; }
.controls {
  display: grid;
  grid-template-columns: minmax(260px, 1.3fr) repeat(4, minmax(150px, 1fr));
  gap: 12px;
  align-items: end;
}
input[type="search"], select {
  min-width: 180px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel-solid);
  color: var(--text);
}
input[type="search"] { min-width: 280px; width: 100%; }
.pagination-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 14px 0 16px;
  padding: 10px 0 2px;
}
.page-button[disabled] { opacity: .5; cursor: not-allowed; }
.page-button { min-width: 108px; }
.clear-filters-button { min-width: 132px; }
.empty-state {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 10px 0 16px;
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: var(--chip);
}
.table-wrap { overflow: auto; padding-top: 28px; }
table { width: 100%; border-collapse: separate; border-spacing: 0; }
th, td { padding: 12px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { text-align: left; position: relative; background: var(--panel-solid); z-index: 1; box-shadow: inset 0 -1px 0 var(--line); }
tbody tr:first-child td { padding-top: 12px; }
.table-wrap table th:nth-child(1), .table-wrap table td:nth-child(1) { width: 86px; }
.table-wrap table th:nth-child(2), .table-wrap table td:nth-child(2) { min-width: 170px; }
.table-wrap table th:nth-child(5), .table-wrap table td:nth-child(5) { min-width: 170px; }
.table-wrap table th:nth-child(6), .table-wrap table td:nth-child(6) { min-width: 190px; }
.table-wrap table th:nth-child(7), .table-wrap table td:nth-child(7) { min-width: 180px; }
.table-wrap table th:nth-child(8), .table-wrap table td:nth-child(8) { width: 108px; }
.muted { color: var(--muted); font-size: .92rem; line-height: 1.45; }
.table-wrap td .muted { margin-top: 6px; }
.regions-grid, .card-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.footer { color: var(--muted); padding-bottom: 48px; }
.footer a { color: var(--accent); }
.university-link { color: var(--text); text-decoration: none; }
.university-link:hover { color: var(--accent); }
.flag-label { margin-right: 6px; }
.region-list-link { color: var(--text); text-decoration: none; }
.region-list-link:hover { color: var(--accent); }
.map-head { align-items: center; }
.map-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.map-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--panel-solid) 94%, transparent);
  min-height: 520px;
}
#world-map { width: 100%; height: 520px; }
.leaflet-container {
  background: linear-gradient(180deg, rgba(128, 180, 255, 0.08), rgba(128, 180, 255, 0.02));
  color: var(--text);
}
.leaflet-popup-content-wrapper,
.leaflet-popup-tip {
  background: var(--panel-solid);
  color: var(--text);
}
.leaflet-control-attribution {
  background: color-mix(in srgb, var(--panel-solid) 92%, transparent) !important;
  color: var(--muted);
}
.leaflet-control-attribution a { color: var(--accent); }

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
    justify-items: stretch;
    gap: 12px;
  }
  .topbar-nav, .theme-toggle { justify-content: center; }
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 24px; padding-top: 28px; padding-bottom: 20px; }
  .section-head { flex-direction: column; align-items: stretch; }
  .controls { grid-template-columns: 1fr 1fr; }
  input[type="search"], select { min-width: 100%; }
  .pagination-bar { flex-direction: column; }
  .map-controls { justify-content: flex-start; }
}

@media (max-width: 680px) {
  .topbar { padding: 12px 16px; }
  .topbar-nav a, .theme-button, .page-button { font-weight: 600; }
  .controls { grid-template-columns: 1fr; }
  .clear-filters-button { width: 100%; }
  .map-shell { min-height: 420px; }
  #world-map { height: 420px; }
  main, .hero, .footer, .narrow { padding: 18px; }
  .hero-copy > p:not(.eyebrow) { font-size: 1rem; }
  .table-wrap { overflow: visible; }
  table, thead, tbody, tr, td { display: block; width: 100%; }
  thead { display: none; }
  tbody { display: grid; gap: 12px; }
  tr {
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 8px 12px;
    background: color-mix(in srgb, var(--panel-solid) 92%, transparent);
    box-shadow: var(--shadow);
  }
  td {
    border-bottom: 0;
    padding: 8px 0;
  }
  td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 4px;
    color: var(--muted);
    font-size: .76rem;
    text-transform: uppercase;
    letter-spacing: .08em;
  }
  .table-wrap table th:nth-child(1), .table-wrap table td:nth-child(1),
  .table-wrap table th:nth-child(2), .table-wrap table td:nth-child(2),
  .table-wrap table th:nth-child(5), .table-wrap table td:nth-child(5),
  .table-wrap table th:nth-child(6), .table-wrap table td:nth-child(6),
  .table-wrap table th:nth-child(7), .table-wrap table td:nth-child(7),
  .table-wrap table th:nth-child(8), .table-wrap table td:nth-child(8) { width: 100%; min-width: 100%; }
}