:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1d2433;
  --quiet: #5d6679;
  --line: #e2e5eb;
  --accent: #2563eb;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

@media (prefers-color-scheme: dark) {
  :root { --bg: #11151c; --card: #1a202b; --ink: #e8ebf1; --quiet: #9aa3b5; --line: #2c3442; --accent: #6b9bff; }
}

body { margin: 0; padding: 24px 16px 48px; max-width: 1040px; margin-inline: auto; }
header h1 { margin: 0 0 4px; font-size: 1.6rem; }
.sub { margin: 0 0 24px; color: var(--quiet); }

#cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; }
.card {
  display: flex; flex-direction: column; gap: 4px; text-align: left; cursor: pointer;
  padding: 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font: inherit;
}
.card:hover, .card[aria-pressed="true"] { border-color: var(--accent); }
.city { font-weight: 600; }
.temp { font-size: 2rem; font-weight: 600; }
.desc { color: var(--ink); }
.meta { color: var(--quiet); font-size: 0.85rem; }

#history { margin-top: 28px; padding: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.history-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.history-head h2 { margin: 0; font-size: 1.1rem; }
select { font: inherit; margin-left: 6px; }
#chart { width: 100%; height: auto; margin-top: 12px; }
#chart .grid { stroke: var(--line); }
#chart .axis { fill: var(--quiet); font-size: 11px; }
#chart .line { fill: none; stroke: var(--accent); stroke-width: 2; }
#error { color: #c0392b; margin-top: 16px; }

footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--quiet); font-size: 0.85rem; }
footer code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--ink); }