/* NuBench — minimal dark theme with Cherenkov-cyan accent. */

:root,
:root[data-theme="dark"] {
  --bg: #0a0f1a;
  --bg-elev: #0f1626;
  --bg-card: #101828;
  --border: rgba(148, 178, 218, 0.13);
  --border-strong: rgba(148, 178, 218, 0.25);
  --text: #e7edf6;
  --text-muted: #93a1b7;
  --text-faint: #64748b;
  --accent: #38cde0;
  --accent-soft: rgba(56, 205, 224, 0.12);
  --accent-text: #6ee4f2;
  --best: #6ee4f2;
  --code-bg: #0c1322;
  --shadow: 0 12px 40px rgba(2, 8, 20, 0.5);
  --grid-line: rgba(148, 178, 218, 0.09);
  color-scheme: dark;
}

/* OS light preference applies until an explicit theme is stamped on :root */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #fafbfd;
    --bg-elev: #ffffff;
    --bg-card: #ffffff;
    --border: rgba(15, 40, 80, 0.1);
    --border-strong: rgba(15, 40, 80, 0.2);
    --text: #0d1626;
    --text-muted: #4b5a70;
    --text-faint: #8494aa;
    --accent: #0891b2;
    --accent-soft: rgba(8, 145, 178, 0.08);
    --accent-text: #0e7490;
    --best: #0e7490;
    --code-bg: #f1f4f9;
    --shadow: 0 10px 30px rgba(15, 40, 80, 0.08);
    --grid-line: rgba(15, 40, 80, 0.07);
    color-scheme: light;
  }
}

:root[data-theme="light"] {
  --bg: #fafbfd;
  --bg-elev: #ffffff;
  --bg-card: #ffffff;
  --border: rgba(15, 40, 80, 0.1);
  --border-strong: rgba(15, 40, 80, 0.2);
  --text: #0d1626;
  --text-muted: #4b5a70;
  --text-faint: #8494aa;
  --accent: #0891b2;
  --accent-soft: rgba(8, 145, 178, 0.08);
  --accent-text: #0e7490;
  --best: #0e7490;
  --code-bg: #f1f4f9;
  --shadow: 0 10px 30px rgba(15, 40, 80, 0.08);
  --grid-line: rgba(15, 40, 80, 0.07);
  color-scheme: light;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mono,
code, pre, td.num, .stat-num {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
}

a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand .nu { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 0.92rem;
  color: var(--text-muted);
}
.nav-links a { color: var(--text-muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-spacer { flex: 1; }

.nav-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-btn svg { width: 17px; height: 17px; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-bg svg { position: absolute; right: -140px; top: -120px; opacity: 0.85; }

.hero-glow {
  position: absolute;
  width: 720px;
  height: 720px;
  right: -180px;
  top: -260px;
  background: radial-gradient(circle,
    rgba(56, 205, 224, 0.14) 0%,
    rgba(56, 205, 224, 0.04) 40%,
    transparent 70%);
  pointer-events: none;
}
:root[data-theme="light"] .hero-glow { opacity: 0.5; }

.hero-inner {
  position: relative;
  padding: 96px 0 84px;
  max-width: 820px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 20px;
}
.hero-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 22px;
}
.hero h1 .nu { color: var(--accent); }

.hero p.lede {
  font-size: 1.14rem;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 34px;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 56px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.94rem;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn svg { width: 16px; height: 16px; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #06222a;
}
.btn.primary:hover { filter: brightness(1.08); }

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--border);
  padding-top: 26px;
}
.stat {
  padding-right: 30px;
  margin-right: 30px;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; margin-right: 0; padding-right: 0; }
.stat-num {
  font-size: 1.5rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--text);
}
.stat-num .unit { color: var(--accent-text); font-size: 1.05rem; }
.stat-label {
  font-size: 0.82rem;
  color: var(--text-faint);
  margin-top: 2px;
}

/* ---------- sections ---------- */

section { padding: 84px 0 10px; }

.sec-head { max-width: 680px; margin-bottom: 40px; }
.sec-kicker {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: 10px;
}
.sec-head h2 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}
.sec-head p { color: var(--text-muted); font-size: 0.98rem; }

/* ---------- leaderboard ---------- */

.task-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-elev);
  width: fit-content;
  margin-bottom: 26px;
}
.task-tab {
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.task-tab:hover { color: var(--text); }
.task-tab.active {
  background: var(--accent-soft);
  color: var(--accent-text);
}

.task-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 780px;
  margin-bottom: 8px;
}
.task-desc .metric-note { color: var(--text-faint); }

.task-takeaway {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: 10px;
  padding: 10px 16px;
  max-width: 780px;
  margin: 16px 0 30px;
}
.task-takeaway::before {
  content: "▸";
  color: var(--accent-text);
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 26px 20px;
  margin-bottom: 22px;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.panel-title { font-size: 1.02rem; font-weight: 650; }
.panel-title .dir {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-faint);
  margin-left: 10px;
}

.legend { display: flex; flex-wrap: wrap; gap: 16px; font-size: 0.85rem; color: var(--text-muted); }
.legend .item { display: inline-flex; align-items: center; gap: 7px; }
.legend .dot { width: 9px; height: 9px; border-radius: 3px; }

.chart-scroll { overflow-x: auto; }
.chart-scroll svg { display: block; }
.chart-note { font-size: 0.8rem; color: var(--text-faint); margin-top: 8px; }

/* dataset chips */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.chip {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.87rem;
  font-weight: 550;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.chip:hover { color: var(--text); border-color: var(--border-strong); }
.chip.active {
  border-color: var(--accent);
  color: var(--accent-text);
  background: var(--accent-soft);
}

/* results table */
.table-scroll { overflow-x: auto; }

table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  white-space: nowrap;
}
table.results th, table.results td {
  padding: 9px 14px;
  text-align: right;
}
table.results th:first-child, table.results td:first-child {
  text-align: left;
  padding-left: 4px;
}
table.results thead th {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border-strong);
}
table.results thead tr.groups th {
  border-bottom: none;
  padding-bottom: 2px;
  color: var(--text-muted);
  font-weight: 650;
}
table.results thead tr.groups th.group {
  border-bottom: 1px solid var(--border);
}
table.results tbody tr { border-bottom: 1px solid var(--border); }
table.results tbody tr:last-child { border-bottom: none; }
table.results td.num { font-size: 0.88rem; color: var(--text-muted); }
table.results td.num .err { font-size: 0.72rem; color: var(--text-faint); }
table.results td.num .best { color: var(--best); font-weight: 700; }
table.results td.model {
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 9px;
}
table.results td.model .dot { width: 9px; height: 9px; border-radius: 3px; flex: none; }
.tbl-note { font-size: 0.8rem; color: var(--text-faint); margin-top: 12px; }

/* paper figures */
.fig-grid { display: grid; gap: 26px; }
.figure { margin: 0; }
.fig-frame {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}
.fig-frame img { display: block; width: 100%; height: auto; }
.fig-frame a { display: block; }
.figure figcaption {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-top: 10px;
  max-width: 900px;
}

/* ---------- datasets ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.ds-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}
.ds-card:hover { border-color: var(--border-strong); }

.ds-art {
  position: relative;
  background:
    radial-gradient(120% 90% at 50% 0%,
      rgba(56, 205, 224, 0.07), transparent 60%),
    var(--bg-elev);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 170px;
}
.ds-art svg { display: block; }
.ds-art .scale {
  position: absolute;
  right: 12px;
  bottom: 9px;
  font-size: 0.72rem;
  color: var(--text-faint);
}

.ds-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }

.ds-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.ds-title { font-size: 1.06rem; font-weight: 650; letter-spacing: -0.01em; }

.badge {
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}
.badge.ice { color: #9ecbff; border-color: rgba(158, 203, 255, 0.4); }
:root[data-theme="light"] .badge.ice { color: #2563eb; border-color: rgba(37, 99, 235, 0.4); }
.badge.water { color: var(--accent-text); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }

.ds-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
  margin-bottom: 16px;
}
.ds-stat .k { font-size: 0.73rem; color: var(--text-faint); }
.ds-stat .v { font-size: 0.9rem; font-weight: 600; color: var(--text); }

.ds-links {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.ds-links a {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.ds-links a:hover {
  text-decoration: none;
  color: var(--accent-text);
  border-color: var(--accent);
}

/* ---------- models ---------- */

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 18px;
}
.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--mc, var(--accent));
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
}
.model-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 4px;
}
.model-name { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em; }
.model-params { font-size: 0.8rem; color: var(--text-faint); }
.model-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.model-tags span {
  font-size: 0.72rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 6px;
}
.model-desc { font-size: 0.88rem; color: var(--text-muted); flex: 1; margin-bottom: 14px; }
.model-src { font-size: 0.84rem; font-weight: 600; }

/* ---------- getting started ---------- */

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}
.step-n {
  display: inline-flex;
  width: 26px;
  height: 26px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.step h3 { font-size: 0.98rem; font-weight: 650; margin-bottom: 8px; }
.step p { font-size: 0.87rem; color: var(--text-muted); margin-bottom: 12px; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
  font-size: 0.8rem;
  line-height: 1.55;
  overflow-x: auto;
  color: var(--text);
}
pre .c { color: var(--text-faint); }

/* ---------- citation ---------- */

.cite-box {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}
.cite-box h3 { font-size: 0.95rem; font-weight: 650; margin-bottom: 10px; }
.copy-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.copy-btn:hover { color: var(--accent-text); border-color: var(--accent); }

.rel-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }

/* ---------- footer ---------- */

footer {
  margin-top: 90px;
  border-top: 1px solid var(--border);
  padding: 36px 0 48px;
  font-size: 0.86rem;
  color: var(--text-faint);
}
.foot-inner { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; }
.foot-links { display: flex; gap: 18px; }
.foot-links a { color: var(--text-muted); }

/* ---------- generative art ---------- */

.gdot { fill: var(--accent); opacity: 0.75; }
.gdot.infill { fill: var(--text-muted); opacity: 0.9; }

@keyframes twinkle {
  0%, 100% { opacity: 0.1; }
  50% { opacity: 0.55; }
}
.twinkle { animation: twinkle 4.2s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  .twinkle { animation: none; }
}

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .nav-links { display: none; }
  .hero-inner { padding: 64px 0 56px; }
  .stat { padding-right: 22px; margin-right: 22px; }
  section { padding: 60px 0 6px; }
  .panel { padding: 18px 16px 14px; }
}