/* =========================================================================
   Correlate — amber-phosphor market terminal
   Editorial serif (Fraunces) + terminal mono (IBM Plex Mono).
   Dark-first; light "paper" mode. Data colors are the validated dataviz
   diverging (blue↔red) + categorical ramps.
   ========================================================================= */

:root {
  /* dark is the default theme */
  --page: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #201f1e;
  --ink: #f4f3ef;
  --secondary: #c3c2b7;
  --muted: #8c8a83;
  --grid: #262523;
  --axis: #3a3936;
  --hairline: rgba(255, 255, 255, 0.09);
  --accent: #e6b422;          /* amber */
  --accent-soft: rgba(230, 180, 34, 0.14);

  /* diverging (correlation) */
  --div-neg: #3d8bf0;
  --div-mid: #34332f;
  --div-pos: #ec6a5f;
  --cell-empty: #232220;

  /* categorical (dark steps) */
  --series-1: #3987e5;
  --series-2: #199e70;
  --series-3: #c98500;
  --series-4: #37a24a;
  --series-5: #9085e9;
  --series-6: #e66767;
  --series-7: #d55181;
  --series-8: #d95926;

  --radius: 14px;
  --font-display: 'Fraunces', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --page: #f4f2ec;
    --surface: #fcfbf7;
    --surface-2: #f6f4ee;
    --ink: #17150f;
    --secondary: #52514e;
    --muted: #8a8880;
    --grid: #e6e3d9;
    --axis: #cbc8bd;
    --hairline: rgba(20, 18, 12, 0.12);
    --accent: #9a6a00;
    --accent-soft: rgba(154, 106, 0, 0.12);
    --div-neg: #2a78d6;
    --div-mid: #ece9e2;
    --div-pos: #d84a45;
    --cell-empty: #eceae2;
    --series-1: #2a78d6; --series-2: #1baf7a; --series-3: #b07600; --series-4: #1f7a2e;
    --series-5: #4a3aa7; --series-6: #d0322f; --series-7: #c14a78; --series-8: #cf551f;
  }
}

[data-theme="light"] {
  --page: #f4f2ec; --surface: #fcfbf7; --surface-2: #f6f4ee;
  --ink: #17150f; --secondary: #52514e; --muted: #8a8880;
  --grid: #e6e3d9; --axis: #cbc8bd; --hairline: rgba(20, 18, 12, 0.12);
  --accent: #9a6a00; --accent-soft: rgba(154, 106, 0, 0.12);
  --div-neg: #2a78d6; --div-mid: #ece9e2; --div-pos: #d84a45; --cell-empty: #eceae2;
  --series-1: #2a78d6; --series-2: #1baf7a; --series-3: #b07600; --series-4: #1f7a2e;
  --series-5: #4a3aa7; --series-6: #d0322f; --series-7: #c14a78; --series-8: #cf551f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* faint grain for atmosphere */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap { position: relative; z-index: 1; max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ------------------------------------------------------------------ header */
header {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 26px 0 20px; border-bottom: 1px solid var(--hairline);
  gap: 18px; flex-wrap: wrap;
}
.wordmark { display: flex; align-items: baseline; gap: 12px; }
.wordmark .glyph { color: var(--accent); font-size: 1.4rem; line-height: 1; transform: translateY(2px); }
.wordmark h1 {
  margin: 0; font-family: var(--font-display); font-weight: 400; font-style: italic;
  font-size: 1.85rem; letter-spacing: -0.01em; font-optical-sizing: auto;
}
.wordmark h1 b { font-weight: 600; font-style: normal; }
.meta { display: flex; align-items: center; gap: 18px; }
.stamp { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.stamp b { color: var(--secondary); font-weight: 500; }
.theme-toggle {
  background: none; border: 1px solid var(--hairline); color: var(--secondary);
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  padding: 6px 12px; border-radius: 999px; cursor: pointer; text-transform: uppercase;
  transition: border-color 0.2s, color 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--ink); }

/* --------------------------------------------------------------------- nav */
nav { display: flex; gap: 4px; padding: 18px 0 0; flex-wrap: wrap; }
.tab {
  position: relative; background: none; border: none; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--muted); padding: 10px 16px 14px; transition: color 0.18s;
}
.tab:hover { color: var(--secondary); }
.tab.active { color: var(--ink); }
.tab::after {
  content: ''; position: absolute; left: 16px; right: 16px; bottom: 0; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 0.25s ease;
}
.tab.active::after { transform: scaleX(1); }

/* -------------------------------------------------------------------- hero */
.hero {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 24px;
  padding: 30px 0 24px; border-bottom: 1px solid var(--hairline); flex-wrap: wrap;
}
.hero-main { min-width: 0; }
.hero-label { font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.hero-value {
  font-family: var(--font-display); font-weight: 500; font-optical-sizing: auto;
  font-size: clamp(3rem, 9vw, 5.4rem); line-height: 0.92; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.hero-value.pos { color: var(--div-pos); }
.hero-value.neg { color: var(--div-neg); }
.hero-sub { margin-top: 10px; color: var(--secondary); font-size: 0.9rem; }
.hero-chips { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.chip {
  border: 1px solid var(--hairline); border-radius: 10px; padding: 10px 14px; background: var(--surface);
  min-width: 128px;
}
.chip .k { font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.chip .v { font-family: var(--font-display); font-size: 1.5rem; margin-top: 4px; font-variant-numeric: tabular-nums; }
.chip.link { cursor: pointer; transition: border-color 0.2s; }
.chip.link:hover { border-color: var(--accent); }

/* ---------------------------------------------------------------- controls */
.controls { display: flex; gap: 22px; flex-wrap: wrap; align-items: flex-end; padding: 22px 0; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field > label { font-size: 0.68rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--muted); }
select {
  appearance: none; background: var(--surface); color: var(--ink); cursor: pointer;
  border: 1px solid var(--hairline); border-radius: 9px; padding: 9px 34px 9px 13px;
  font-family: var(--font-mono); font-size: 0.86rem; min-width: 150px;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: right 15px center, right 10px center; background-size: 5px 5px; background-repeat: no-repeat;
  transition: border-color 0.18s;
}
select:hover, select:focus { border-color: var(--accent); outline: none; }

.window-field { flex: 1; min-width: 260px; }
.chip-row { display: flex; gap: 6px; flex-wrap: wrap; }
.wchip {
  background: var(--surface); border: 1px solid var(--hairline); color: var(--secondary);
  font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.06em; padding: 7px 12px;
  border-radius: 8px; cursor: pointer; transition: all 0.16s;
}
.wchip:hover { color: var(--ink); border-color: var(--axis); }
.wchip.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.slider-row { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
input[type=range] {
  -webkit-appearance: none; appearance: none; height: 3px; border-radius: 2px;
  background: var(--axis); flex: 1; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--page); cursor: pointer;
}
input[type=range]::-moz-range-thumb { width: 15px; height: 15px; border-radius: 50%; background: var(--accent); border: 2px solid var(--page); cursor: pointer; }
.wval { font-size: 0.82rem; color: var(--secondary); }
.wval b { color: var(--accent); }
.hint { font-size: 0.72rem; color: var(--muted); margin: -2px 0 2px; max-width: 360px; line-height: 1.45; }

/* time-range bar below the chart */
.range-bar { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; padding: 16px 0 2px; }
.range-label { font-size: 0.68rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--muted); }

.checks { display: flex; flex-wrap: wrap; gap: 8px 14px; padding-top: 4px; }
.checks label { display: inline-flex; align-items: center; gap: 6px; font-size: 0.8rem; color: var(--secondary); cursor: pointer; }
.checks input { accent-color: var(--accent); cursor: pointer; }

/* ------------------------------------------------------------------ charts */
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; padding: 4px 2px 14px; }
.legend-chip { display: inline-flex; align-items: center; gap: 7px; font-size: 0.78rem; color: var(--secondary); }
.legend-chip i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }

.chart-card {
  position: relative; background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 16px; box-shadow: 0 1px 0 rgba(0,0,0,0.2);
}
.chart-host { position: relative; width: 100%; }
#lineHost { height: 460px; }
#heatHost { height: min(82vw, 680px); }
.chart-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.scale-legend { display: flex; align-items: center; gap: 10px; justify-content: center; padding: 14px 0 2px; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.08em; }
.scale-bar { width: 200px; height: 8px; border-radius: 4px; background: linear-gradient(90deg, var(--div-neg), var(--div-mid), var(--div-pos)); }

.chart-tooltip {
  position: absolute; z-index: 5; pointer-events: none;
  background: var(--surface-2); border: 1px solid var(--hairline); border-radius: 9px;
  padding: 9px 11px; font-size: 0.78rem; min-width: 120px; box-shadow: 0 6px 22px rgba(0,0,0,0.35);
}
.tt-date { color: var(--muted); font-size: 0.72rem; margin-bottom: 5px; letter-spacing: 0.05em; }
.tt-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 1px 0; }
.tt-row span { display: inline-flex; align-items: center; gap: 6px; color: var(--secondary); }
.tt-row i { width: 9px; height: 9px; border-radius: 2px; }
.tt-row b { font-variant-numeric: tabular-nums; color: var(--ink); }
.tt-big { font-family: var(--font-display); font-size: 1.7rem; margin-top: 3px; font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------ footer */
.methodology { padding: 40px 0 60px; max-width: 720px; }
.methodology h2 { font-family: var(--font-display); font-weight: 500; font-size: 1.3rem; margin: 0 0 14px; }
.methodology p { color: var(--secondary); font-size: 0.9rem; line-height: 1.7; margin: 0 0 14px; }
.methodology a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-soft); }
.methodology a:hover { border-bottom-color: var(--accent); }

/* ---------------------------------------------------------------- reveal fx */
.reveal { opacity: 0; transform: translateY(14px); animation: rise 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }
.reveal.d1 { animation-delay: 0.05s; } .reveal.d2 { animation-delay: 0.13s; }
.reveal.d3 { animation-delay: 0.21s; } .reveal.d4 { animation-delay: 0.29s; }
@keyframes rise { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .reveal { animation: none; opacity: 1; transform: none; } }

[hidden] { display: none !important; }

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .controls { gap: 16px; }
  select { min-width: 130px; }
  #lineHost { height: 380px; }
}