/* =========================================================
   wbtc viewer — modern research dashboard
   ========================================================= */

:root {
  --bg: #0b0d12;
  --bg-soft: #11141b;
  --bg-card: #141821;
  --bg-card-2: #181d28;
  --border: #232a39;
  --border-soft: #1c2230;
  --fg: #e7ecf3;
  --fg-mute: #9aa6b9;
  --fg-dim: #6b7689;
  --accent: #7cf2d6;
  --accent-2: #7c83f2;
  --accent-warm: #f2c97c;
  --good: #5dd6a8;
  --bad: #ef6e6e;
  --gridline: rgba(255, 255, 255, 0.05);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 20px 60px -30px rgba(0, 0, 0, 0.6);

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: "Newsreader", "Iowan Old Style", Georgia, serif;
}

[data-theme="light"] {
  --bg: #f7f8fa;
  --bg-soft: #ffffff;
  --bg-card: #ffffff;
  --bg-card-2: #f3f5f9;
  --border: #e3e7ee;
  --border-soft: #ecf0f6;
  --fg: #0f1623;
  --fg-mute: #4a5568;
  --fg-dim: #7a8398;
  --accent: #0e9a7a;
  --accent-2: #4a52d8;
  --accent-warm: #b3812e;
  --good: #0f9466;
  --bad: #c8453d;
  --gridline: rgba(0, 0, 0, 0.06);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.02) inset, 0 10px 30px -20px rgba(0, 0, 0, 0.15);
}

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

body {
  background:
    radial-gradient(1200px 600px at 75% -10%, rgba(124, 131, 242, 0.10), transparent 60%),
    radial-gradient(900px 500px at 10% 5%, rgba(124, 242, 214, 0.06), transparent 60%),
    var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01" on, "cv11" on;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

code, .num, .mono { font-family: var(--font-mono); font-feature-settings: "zero" on, "ss02" on; }
.num { font-variant-numeric: tabular-nums; }

.muted { color: var(--fg-mute); }
.muted-h { color: var(--fg-mute); font-weight: 400; font-size: 0.7em; letter-spacing: 0.04em; }
.small { font-size: 12px; }

/* ===== Topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border-soft);
}
.topbar-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(160deg, rgba(124, 242, 214, 0.12), rgba(124, 131, 242, 0.08));
  border: 1px solid var(--border);
}
.brand-name { font-weight: 700; letter-spacing: -0.01em; font-size: 18px; }
.brand-name.small { font-size: 14px; }
.brand-tag { color: var(--fg-mute); font-size: 12px; }

.nav { display: flex; gap: 18px; margin-left: auto; }
.nav a {
  color: var(--fg-mute);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  text-decoration: none;
}
.nav a:hover { color: var(--fg); border-bottom-color: var(--accent); }

.topbar-actions { display: flex; align-items: center; gap: 10px; }
.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-mute);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}
.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-mute);
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  display: inline-flex;
}
.ghost-btn:hover { color: var(--fg); border-color: var(--accent); }

/* ===== Hero ===== */
.hero { padding: 80px 28px 56px; }
.hero-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 64px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.hero h1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  margin: 0 0 22px;
}
.grad {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
}
.lede { color: var(--fg-mute); font-size: 16px; max-width: 60ch; }
.lede strong { color: var(--fg); font-weight: 600; }

.hero-cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 10px;
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent) 70%, var(--accent-2)));
  color: #06241e;
  border: 1px solid color-mix(in oklab, var(--accent) 60%, transparent);
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 16px;
  position: relative;
  overflow: hidden;
}
.stat::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(120% 80% at 100% 0%, rgba(124, 242, 214, 0.06), transparent 60%);
  pointer-events: none;
}
.stat .label {
  color: var(--fg-mute);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.stat .val {
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: -0.01em;
  margin-top: 8px;
  color: var(--fg);
}
.stat .val.good { color: var(--good); }
.stat .val.bad { color: var(--bad); }
.stat .sub { color: var(--fg-dim); font-size: 12px; margin-top: 6px; }

/* ===== Bands & sections ===== */
.band { padding: 72px 28px; border-top: 1px solid var(--border-soft); }
.band.alt { background: linear-gradient(180deg, transparent, var(--bg-soft) 60%, transparent); }
.container { max-width: 1240px; margin: 0 auto; }

.section-head { margin-bottom: 28px; max-width: 80ch; }
.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 32px;
  letter-spacing: -0.01em;
  margin: 6px 0 8px;
  color: var(--fg);
}
.section-head .sub { color: var(--fg-mute); margin: 0; }
.section-head .sub code { background: var(--bg-card-2); padding: 2px 6px; border-radius: 5px; font-size: 0.9em; }

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.chart-card { padding: 16px 18px 22px; }
.chart-head h3 { margin: 0 0 4px; font-weight: 600; font-size: 16px; letter-spacing: -0.01em; }
.chart-head .sub { margin: 0; color: var(--fg-mute); font-size: 13px; }
.chart-mini-head { font-size: 13px; font-weight: 600; color: var(--fg-mute); margin: 6px 4px 6px; letter-spacing: 0.02em; }

.chart-host { width: 100%; height: 420px; }
.chart-host.small { height: 320px; }
.chart-host.returns { height: 160px; margin-top: 6px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
@media (max-width: 920px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* ===== Controls ===== */
.controls {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  align-items: flex-end;
}
.control-group { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.control-group.grow { flex: 1; min-width: 240px; }
.control-group label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  font-weight: 600;
}

.seg {
  display: inline-flex;
  background: var(--bg-card-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 3px;
  gap: 2px;
}
.seg button {
  background: transparent;
  border: none;
  color: var(--fg-mute);
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 0.01em;
}
.seg button:hover { color: var(--fg); }
.seg button.active {
  background: var(--bg-card);
  color: var(--fg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 0 0 1px var(--border);
}

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }

/* preset row above method chips */
.preset-row { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
.preset-row .preset {
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--border-soft);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 6px;
  cursor: pointer;
}
.preset-row .preset:hover { color: var(--fg); border-color: var(--border); }
.preset-row .preset.active {
  color: var(--accent);
  border-color: color-mix(in oklab, var(--accent) 45%, var(--border));
  background: color-mix(in oklab, var(--accent) 10%, transparent);
}

/* tiny in-card control row (e.g. mean-CRPS abs/Δ toggle) */
.controls-mini { display: flex; gap: 8px; margin: -2px 0 8px; }

/* short reading-guide caption that lives inside a chart card */
.reading-guide {
  margin: 4px 2px 12px;
  color: var(--fg-dim);
  font-size: 12px;
  font-style: italic;
  line-height: 1.45;
}
.reading-guide strong { color: var(--fg-mute); font-style: normal; font-weight: 600; }
.chip-toggle {
  background: var(--bg-card-2);
  color: var(--fg-mute);
  border: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 5px 10px;
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.chip-toggle .dot { width: 7px; height: 7px; border-radius: 999px; background: var(--fg-dim); }
.chip-toggle:hover { color: var(--fg); }
.chip-toggle.active { color: var(--fg); border-color: color-mix(in oklab, var(--accent) 50%, var(--border)); }
.chip-toggle.active .dot { background: var(--c, var(--accent)); }
.chip-toggle.fam-wgeo.active { background: color-mix(in oklab, var(--accent) 14%, transparent); }
.chip-toggle.fam-baseline.active { background: color-mix(in oklab, var(--accent-2) 14%, transparent); }
.chip-toggle.fam-ext.active { background: color-mix(in oklab, var(--accent-warm) 14%, transparent); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; padding: 0; }
table.ledger {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.ledger thead th {
  text-align: left;
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card-2);
}
table.ledger thead th.num { text-align: right; }
table.ledger tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-soft);
}
table.ledger tbody td.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
table.ledger tbody tr:hover { background: rgba(255,255,255,0.02); }
table.ledger tbody tr:last-child td { border-bottom: none; }
.tag {
  display: inline-block;
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--fg-mute);
  background: var(--bg-card-2);
}
.tag.wgeo { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 35%, var(--border)); }
.tag.base { color: var(--accent-2); border-color: color-mix(in oklab, var(--accent-2) 35%, var(--border)); }
.delta.good { color: var(--good); font-weight: 600; }
.delta.bad { color: var(--bad); font-weight: 600; }
.sig-strong { color: var(--good); font-weight: 600; }
.sig-weak { color: var(--fg-mute); }

/* ===== Method grid ===== */
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
@media (max-width: 980px) { .method-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .method-grid { grid-template-columns: 1fr; } }
.m-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 16px 14px;
  position: relative;
  overflow: hidden;
}
.m-card .head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}
.m-card .name { font-family: var(--font-mono); font-weight: 600; color: var(--fg); font-size: 14px; }
.m-card .fam {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.m-card.fam-wgeo .fam { color: var(--accent); }
.m-card.fam-baseline .fam { color: var(--accent-2); }
.m-card.fam-ext .fam { color: var(--accent-warm); }
.m-card .desc { color: var(--fg-mute); font-size: 13px; margin-top: 6px; }
.m-card::after {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--bar, var(--fg-dim));
  opacity: 0.7;
}
.m-card.fam-wgeo { --bar: var(--accent); }
.m-card.fam-baseline { --bar: var(--accent-2); }
.m-card.fam-ext { --bar: var(--accent-warm); }

/* ===== Provenance ===== */
.prov-card h3 { margin: 0 0 12px; font-size: 14px; letter-spacing: 0.01em; }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 6px 14px; font-size: 13px; }
.kv dt { color: var(--fg-dim); font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase; }
.kv dd { margin: 0; color: var(--fg); font-family: var(--font-mono); font-size: 12.5px; overflow-wrap: anywhere; }

/* ===== Footer ===== */
footer { padding: 36px 28px 56px; border-top: 1px solid var(--border-soft); }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-end; gap: 14px; flex-wrap: wrap; }

/* ===== Loading ===== */
.loading {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 16px;
  background: var(--bg);
  z-index: 100;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}
.loading.hidden { display: none; }
.spinner {
  width: 32px; height: 32px;
  border-radius: 999px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .nav { display: none; }
}