:root {
  --bg: #10131a;
  --panel: #171b24;
  --line: #232936;
  --text: #e6e9ef;
  --dim: #8b93a5;
  --up: #26a69a;
  --down: #ef5350;
  --accent: #5b8def;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, "Segoe UI", Roboto, sans-serif;
}

header {
  padding: 18px 24px 10px;
  border-bottom: 1px solid var(--line);
}

h1 { margin: 0; font-size: 19px; font-weight: 600; }
.sub { color: var(--dim); font-size: 13px; margin-top: 4px; }

.picker {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  padding: 16px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.picker label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  color: var(--dim);
}

.picker input, .picker select {
  background: #0d1017;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 6px;
  padding: 7px 9px;
  font-size: 14px;
  min-width: 150px;
}

.picker input:focus, .picker select:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  background: var(--accent);
  border: 0;
  color: #fff;
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 14px;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }
button:disabled { opacity: .5; cursor: default; }

.charts {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 24px 28px;
}

.chart-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 12px 6px;
}

.chart-title {
  font-size: 13px;
  color: var(--dim);
  margin-bottom: 8px;
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.hint { color: var(--text); font-size: 13px; }
.chart { height: 320px; }

footer {
  color: var(--dim);
  font-size: 12px;
  padding: 0 24px 24px;
}