:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e5e7eb;
    --bg: #0f1115;
    --muted: #9ca3af;
    --border: #262b33;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem 1.5rem 3rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  max-width: 900px;
  margin-inline: auto;
}

header h1 {
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--muted);
  margin-top: 0;
}

#search-form {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0 1rem;
}

#city-input {
  flex: 1;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-size: 1rem;
}

button {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

#status {
  color: var(--muted);
  min-height: 1.2em;
}

#chart {
  width: 100%;
  height: 420px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}