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

/* ── Theme variables ── */
:root {
  --bg: #0d0d0d;
  --text: #e8e6e1;
  --subtext: #8a8a8e;
  --border: #2a2a2e;
  --card-bg: #1e1e22;
  --input-bg: #191919;
  --grid: #242428;
  --axis: #555;
  --tip-bg: #1e1e22;
  --tip-border: #2a2a2e;
  --focus: #6b9ebb;
  --accent: #6b9ebb;
  --positive: #4ade80;
}

[data-theme="light"] {
  --bg: #f4e9da;
  --text: #1e1410;
  --subtext: #8a7060;
  --border: #d4c4b0;
  --card-bg: #ede3d6;
  --input-bg: #f4e9da;
  --grid: #e8dace;
  --axis: #8a7060;
  --tip-bg: #ede3d6;
  --tip-border: #d4c4b0;
  --focus: #4a7a9a;
  --accent: #4a7a9a;
  --positive: #16863a;
}

body {
  font-family: 'DM Mono', monospace;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px 16px 24px;
  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: 0.72rem;
  color: var(--subtext);
  margin-top: -8px;
  line-height: 1.4;
}

/* ── Form ── */
.form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.form-group label {
  font-size: 0.68rem;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Capital input ── */
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrap input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 8px;
  padding-right: 28px;
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
.input-wrap input::-webkit-outer-spin-button,
.input-wrap input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.input-wrap input:focus { border-color: var(--focus); }

.input-unit {
  position: absolute;
  right: 8px;
  font-size: 0.68rem;
  color: var(--subtext);
  pointer-events: none;
}

/* ── Slider header (label + value) ── */
.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.slider-value {
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text);
}

/* ── Range slider ── */
.slider-wrap {
  position: relative;
  padding-bottom: 22px;
}

.slider-wrap input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  margin: 0;
}

.slider-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--focus);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--focus);
  cursor: pointer;
  transition: box-shadow 0.15s;
}
.slider-wrap input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--focus);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--focus);
  cursor: pointer;
}

.slider-wrap input[type="range"]:active::-webkit-slider-thumb {
  box-shadow: 0 0 0 4px rgba(107,158,187,0.25);
}
[data-theme="light"] .slider-wrap input[type="range"]:active::-webkit-slider-thumb {
  box-shadow: 0 0 0 4px rgba(74,122,154,0.25);
}

/* ── Slider stops (tick marks + labels) ── */
.slider-stops {
  position: absolute;
  left: 0;
  right: 0;
  top: 14px;
  height: 20px;
  pointer-events: none;
}

.stop {
  position: absolute;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  pointer-events: auto;
  cursor: pointer;
  color: var(--subtext);
  transition: color 0.15s;
  background: none;
  border: none;
  padding: 0;
  font-family: 'DM Mono', monospace;
}
.stop:hover { color: var(--text); }
.stop.active { color: var(--focus); }

.stop-tick {
  width: 1px;
  height: 6px;
  background: var(--border);
  transition: background 0.15s;
}
.stop.active .stop-tick { background: var(--focus); }

.stop-label {
  font-size: 0.52rem;
  line-height: 1;
  white-space: nowrap;
}

/* ── 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;
}

/* ── Tooltip ── */
.chart-tooltip {
  position: absolute;
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
  border-radius: 8px;
  padding: 8px 11px;
  pointer-events: none;
  z-index: 10;
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
  white-space: nowrap;
  min-width: 120px;
}
.chart-tooltip[hidden] { display: none; }

.tip-header {
  font-size: 0.62rem;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.tip-rows {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tip-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
}

.tip-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.tip-val {
  font-weight: 500;
}

/* ── Summary ── */
.summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.summary-card {
  flex: 1;
  min-width: 140px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: background 0.2s, border-color 0.2s;
}

.summary-label {
  font-size: 0.62rem;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.summary-value {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  font-family: 'DM Serif Display', serif;
}

.summary-sub {
  font-size: 0.62rem;
  color: var(--subtext);
}

.summary-value.positive { color: var(--positive); }

/* ── Capture mode ── */
html.capture .form { display: none; }

.summary-params {
  font-size: 0.58rem;
  color: var(--subtext);
  opacity: 0.8;
  line-height: 1.3;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2px;
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .chart-wrap {
    height: 240px;
  }
  .summary-card {
    min-width: 100%;
  }
}