:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c232d;
  --border: #2a3441;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #f7931a;      /* bitcoin orange */
  --price: #58a6ff;
  --avg: #f7931a;
  --band: rgba(247, 147, 26, 0.28);
  --marginal: #d2596e;
  --elec: #7ee787;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  /* Full-page app layout: header and footer keep their natural height,
     main (the chart + controls) takes everything in between. */
  height: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

header {
  position: relative;
  padding: 14px 28px 4px;
  flex: 0 0 auto;
}

.top-toggles {
  position: absolute;
  top: 14px;
  right: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle, .cur-toggle { display: flex; }

.lang-toggle a,
.cur-toggle button {
  display: inline-block;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 4px 10px;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  line-height: normal;
  text-decoration: none;
  cursor: pointer;
}

.lang-toggle a + a,
.cur-toggle button + button { border-left: none; }

.lang-toggle a[aria-current="true"],
.cur-toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: #0d1117;
  border-color: var(--accent);
}

h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 650;
}

h1 .sub {
  font-size: 13px;
  font-weight: 400;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2px 10px;
  margin-left: 8px;
  vertical-align: middle;
}

.tagline {
  max-width: 780px;
  color: var(--muted);
  font-size: 14px;
  margin: 8px 0 0;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.stats.hidden { display: none; }

.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 14px;
  min-width: 108px;
}

.stat-label {
  display: block;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.stat-value {
  font-size: 16px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.stat-value.price { color: var(--price); }
.stat-value.allin { color: var(--avg); }
.stat-value.elec { color: var(--elec); }

main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 16px;
  padding: 10px 28px 12px;
}

main.controls-hidden { grid-template-columns: 1fr; }
main.controls-hidden .controls { display: none; }

.chart-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  position: relative;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

#chart { width: 100%; flex: 1; min-height: 0; }

#toggle_controls {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 10;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 9px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
}

#toggle_controls:hover { border-color: var(--accent); color: var(--text); }

.status {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  pointer-events: none;
}

.status.hidden { display: none; }
.status.error { color: var(--marginal); }

.notice {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  color: var(--muted);
  font-size: 11.5px;
  text-align: center;
  pointer-events: none;
}

.notice.hidden { display: none; }

.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  overflow-y: auto;
}

.control-group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.control-group h3 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.control-group label {
  display: block;
  font-size: 13px;
  margin-bottom: 12px;
}

.control-group label.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.control-group label:last-child { margin-bottom: 0; }

.control-group output {
  float: right;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  margin-top: 6px;
  accent-color: var(--accent);
}

input[type="checkbox"] { accent-color: var(--accent); }

select {
  width: 100%;
  margin-top: 6px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

button#reset {
  width: 100%;
  margin-top: 4px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
}

button#reset:hover { border-color: var(--accent); }

.caveat {
  font-size: 12px;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin: 0;
}

footer {
  flex: 0 0 auto;
  padding: 0 28px 12px;
  color: var(--muted);
  font-size: 12px;
}

footer code { color: var(--accent); }

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

@media (max-width: 900px) {
  /* Small screens: back to a normal scrolling page, chart at fixed height. */
  body { height: auto; overflow: auto; }
  main { grid-template-columns: 1fr; }
  .chart-wrap { flex: none; }
  #chart { flex: none; height: 420px; }
  .controls { overflow: visible; }
}