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

/* ── Theme variables ── */
:root {
  --bg: #0C0E11;
  --text: #e8e6e1;
  --subtext: #8a8a8e;
  --border: #2a2a2e;
  --card-bg: #1e1e22;
  --grid: #242428;
  --axis: #555;
  --line: #6b9ebb;
  --fill-top: rgba(107,158,187,0.22);
  --fill-bot: rgba(107,158,187,0);
  --tip-bg: #1e1e22;
  --tip-border: #2a2a2e;
}

[data-theme="light"] {
  --bg: #f4e9da;
  --text: #1e1410;
  --subtext: #8a7060;
  --border: #d4c4b0;
  --card-bg: #ede3d6;
  --grid: #e8dace;
  --axis: #8a7060;
  --line: #4a7a9a;
  --fill-top: rgba(74,122,154,0.18);
  --fill-bot: rgba(74,122,154,0);
  --tip-bg: #ede3d6;
  --tip-border: #d4c4b0;
}

body {
  font-family: 'DM Mono', monospace;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px 16px 12px;
  transition: background 0.2s, color 0.2s;
}

.container {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── Header ── */
h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.55rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--text);
}

.subtitle {
  font-size: 0.67rem;
  color: var(--subtext);
  margin-top: -8px;
}

/* ── Chart ── */
.chart-wrap {
  position: relative;
  width: 100%;
  height: 300px;
  cursor: crosshair;
}

#chart,
#chart-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#chart-overlay {
  pointer-events: none;
}

/* ── Zoom reset button ── */
.zoom-reset {
  position: absolute;
  top: 6px;
  right: 6px;
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
  border-radius: 6px;
  padding: 4px 10px;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  color: var(--subtext);
  cursor: pointer;
  z-index: 10;
  transition: color 0.2s, border-color 0.2s;
}
.zoom-reset:hover {
  color: var(--line);
  border-color: var(--line);
}
.zoom-reset[hidden] { display: none; }

/* ── Crosshair tooltip ── */
.chart-tooltip {
  position: absolute;
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
  border-radius: 8px;
  padding: 7px 11px;
  pointer-events: none;
  z-index: 10;
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
  white-space: nowrap;
}

.chart-tooltip[hidden] { display: none; }

.tip-date {
  font-size: 0.62rem;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}

.tip-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--line);
}

/* ── Source ── */
.source {
  font-size: 0.65rem;
  color: var(--subtext);
  margin-top: -4px;
}
.source a {
  color: var(--subtext);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s, border-color 0.2s;
}
.source a:hover {
  color: var(--line);
  border-color: var(--line);
}