:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --fg: #14161c;
  --muted: #5c6272;
  --line: rgba(20, 22, 28, 0.12);
  --accent: #3f63f6;
  --card: #ffffff;
}
html[data-theme="dark"] {
  --bg: #0e1116;
  --fg: #f2f4f8;
  --muted: #9aa3b5;
  --line: rgba(242, 244, 248, 0.14);
  --accent: #7c9bff;
  --card: #161b23;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.clock {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  gap: clamp(8px, 2vh, 20px);
  padding: clamp(12px, 3vw, 24px);
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.title { font-size: 13px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); }
.badge {
  font-size: 11px; line-height: 1; padding: 4px 8px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted);
}
.badge[hidden] { display: none; }
.notice {
  margin: 0; padding: 10px 12px; border-radius: 10px; font-size: 13px;
  border: 1px solid var(--line); background: var(--card); color: var(--muted);
}
.notice[hidden] { display: none; }
.face {
  flex: 1;
  display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  gap: clamp(4px, 1.2vh, 12px);
}
.time { display: flex; align-items: baseline; gap: 8px; font-variant-numeric: tabular-nums; }
.digits {
  font-size: clamp(48px, 17vw, 132px);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1;
}
.meridiem { font-size: clamp(14px, 2.4vw, 20px); color: var(--muted); font-weight: 500; }
.seconds {
  font-size: clamp(20px, 5vw, 32px); font-weight: 500; color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.progress { width: 100%; max-width: 420px; height: 4px; border-radius: 999px; background: var(--line); overflow: hidden; }
.progress-fill { display: block; height: 100%; width: 0%; background: var(--accent); transition: width 0.2s linear; }
.date { font-size: clamp(14px, 2.6vw, 18px); }
.weekday { font-size: clamp(13px, 2.2vw, 16px); color: var(--muted); }
.toggle {
  font: inherit; font-size: 13px; padding: 8px 12px; border-radius: 10px; cursor: pointer;
  color: var(--fg); background: var(--card); border: 1px solid var(--line);
}
.toggle:hover { border-color: var(--accent); }
.hint { font-size: 12px; color: var(--muted); }
@media (max-width: 360px) {
  .digits { font-size: clamp(38px, 20vw, 56px); }
  .bar { flex-direction: column; align-items: flex-start; }
}
@media (min-width: 768px) {
  .clock { padding: 28px 32px; }
}