:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c2026;
  --muted: #5f6b7a;
  --border: #dde1e7;
  --accent: #2a6df4;
  --ok: #1a9c55;
  --bad: #d64545;
  --grid: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --card: #181c22;
    --text: #e6e9ee;
    --muted: #93a0b0;
    --border: #2a303a;
    --accent: #6c9bff;
    --ok: #3ecf83;
    --bad: #ff6b6b;
    --grid: rgba(255, 255, 255, 0.08);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

h1 { margin: 0; font-size: 1.5rem; }
h2 { margin: 0 0 12px; font-size: 1.05rem; }

.status { margin: 2px 0 0; color: var(--muted); font-size: 0.9rem; }
.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--muted);
}
.dot.ok { background: var(--ok); }
.dot.bad { background: var(--bad); }

.range { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.range button {
  padding: 7px 14px;
  border: 0;
  background: var(--card);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.range button + button { border-left: 1px solid var(--border); }
.range button.active { background: var(--accent); color: #fff; }

main {
  display: grid;
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 16px 40px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.card-head { display: flex; justify-content: space-between; align-items: baseline; }
.card-head a { color: var(--accent); font-size: 0.9rem; }

.chart { position: relative; height: 320px; }

.term {
  display: block;
  width: 100%;
  height: 640px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #000;
}

.tile {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
}
.tile small { color: var(--muted); font-weight: 400; font-size: 0.85rem; }
.tile:hover { border-color: var(--accent); }

.error {
  margin: 0;
  padding: 10px 14px;
  border: 1px solid var(--bad);
  border-radius: 8px;
  color: var(--bad);
}

@media (max-width: 600px) {
  .chart { height: 260px; }
  .term { height: 480px; }
}