:root {
  --bg: #0f1720;
  --panel: #17222e;
  --panel2: #1e2c3a;
  --ink: #e7eef5;
  --muted: #93a4b5;
  --accent: #38b6ff;
  --up: #ff6b6b;
  --down: #2ec78a;
  --band: rgba(147, 164, 181, .18);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
.topbar {
  padding: 22px 24px 14px;
  background: linear-gradient(180deg, #14202c, var(--bg));
  border-bottom: 1px solid #25313d;
}
h1 { margin: 0; font-size: 26px; font-weight: 700; }
h1 .sub { font-size: 14px; font-weight: 400; color: var(--muted); margin-left: 8px; }
.meta { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
main { max-width: 1040px; margin: 0 auto; padding: 8px 24px 40px; }
section { margin-top: 34px; }
h2 { font-size: 19px; margin: 0 0 4px; }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 14px; max-width: 760px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.card {
  background: var(--panel); border: 1px solid #25313d; border-radius: 12px; padding: 14px 16px;
}
.card h3 { margin: 0; font-size: 15px; }
.card .water { color: var(--muted); font-size: 12px; }
.card .level { font-size: 32px; font-weight: 700; margin: 8px 0 2px; }
.card .level .unit { font-size: 14px; font-weight: 400; color: var(--muted); }
.card .nolive { font-size: 14px; color: var(--muted); margin: 10px 0; }
.card .chg { font-size: 13px; font-weight: 600; }
.chg.up { color: var(--up); } .chg.down { color: var(--down); } .chg.flat { color: var(--muted); }
.gauge { margin-top: 12px; }
.gauge .track { position: relative; height: 8px; border-radius: 5px; background: var(--band); }
.gauge .median { position: absolute; top: -3px; width: 2px; height: 14px; background: var(--muted); }
.gauge .now { position: absolute; top: -5px; width: 3px; height: 18px; background: var(--accent); border-radius: 2px; }
.gauge .scale { display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; margin-top: 5px; }

.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-bottom: 12px; }
.controls label { font-size: 13px; color: var(--muted); }
select {
  background: var(--panel2); color: var(--ink); border: 1px solid #2d3d4d;
  border-radius: 8px; padding: 6px 10px; font-size: 14px; margin-left: 6px;
}
.year-toggles, .station-toggles { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid #2d3d4d; background: var(--panel2); color: var(--muted);
  border-radius: 999px; padding: 4px 11px; font-size: 12px; cursor: pointer; user-select: none;
}
.chip.on { color: #04121c; font-weight: 700; }
.chart-wrap { background: var(--panel); border: 1px solid #25313d; border-radius: 12px; padding: 14px; }
.chart-wrap canvas { max-height: 420px; }
footer { color: var(--muted); font-size: 12px; text-align: center; padding: 24px; border-top: 1px solid #25313d; }
footer a, .meta a { color: var(--accent); }