:root {
  --bg: #0f1420;
  --bg-card: #171e2e;
  --bg-elev: #1f2940;
  --text: #e6ebf4;
  --text-dim: #8a93a6;
  --accent: #4c8dff;
  --up: #f2554f;
  --down: #34c77b;
  --line: #2a3550;
  --radius: 12px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(15, 20, 32, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand h1 { font-size: 18px; font-weight: 700; letter-spacing: 0.5px; }
.brand .subtitle { font-size: 12px; color: var(--text-dim); }

#fundSelect {
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  max-width: 220px;
}

main { max-width: 1080px; margin: 0 auto; padding: 16px; }

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  transition: box-shadow 0.25s;
}

.card .label { font-size: 12px; color: var(--text-dim); margin-bottom: 6px; }
.card .value { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.card .value.big { font-size: 40px; }
.card .sub { font-size: 12px; color: var(--text-dim); margin-top: 6px; }

.premium-card { border-color: var(--accent); }
.premium-card .value { color: var(--text); }

.premium-card.pos .value { color: var(--up); }
.premium-card.neg .value { color: var(--down); }
.premium-card.pos { border-color: var(--up); box-shadow: 0 0 18px rgba(242, 85, 79, 0.25); }
.premium-card.neg { border-color: var(--down); box-shadow: 0 0 18px rgba(52, 199, 123, 0.25); }

.alert-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.alert-title { font-size: 13px; font-weight: 600; }
.alert-inputs { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.alert-inputs label { font-size: 13px; color: var(--text-dim); display: flex; align-items: center; gap: 4px; }
.alert-inputs input {
  width: 64px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
}
.alert-inputs button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
}
.alert-inputs button:disabled { opacity: 0.5; cursor: default; }
.alert-status { font-size: 12px; color: var(--text-dim); }

.charts { margin-top: 16px; display: grid; gap: 12px; }

.chart-box {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.chart-box h2 { font-size: 14px; font-weight: 600; margin-bottom: 10px; }
.chart-box h2 small { color: var(--text-dim); font-weight: 400; margin-left: 6px; }

.chart { width: 100%; height: 380px; }

.chart-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-dim);
  font-size: 13px;
}

footer {
  margin-top: 16px;
  padding: 12px 4px 24px;
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.6;
}
footer .status { color: var(--text); margin-bottom: 4px; }

@media (min-width: 720px) {
  .cards { grid-template-columns: repeat(4, 1fr); }
  .charts { grid-template-columns: 1fr 1fr; }
  .chart { height: 360px; }
}