:root {
  --fg: #1a1a1a;
  --bg: #fafafa;
  --accent: #0066cc;
  --muted: #666;
  --border: #e4e4e4;
  --max: 680px;
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

header, main, footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

h1 { font-size: 1.75rem; margin: 0 0 0.25rem; }
h2 { font-size: 1.25rem; margin-top: 2rem; }

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

.tool {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 2rem;
}

a { color: var(--accent); }

footer {
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --bg: #111;
    --accent: #66aaff;
    --muted: #999;
    --border: #2a2a2a;
  }
  .tool { background: #1a1a1a; }
}

label { display: block; margin-bottom: 0.5rem; font-weight: 600; }

input[type="time"] {
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  margin-right: 0.5rem;
  background: var(--bg);
  color: var(--fg);
}

button {
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
}

button:hover { opacity: 0.92; }

.results ul { margin: 0.5rem 0 0; padding-left: 1.25rem; }
.results li { margin-bottom: 0.25rem; }