:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: rgba(17, 17, 17, 0.58);
  --border: rgba(17, 17, 17, 0.08);
  --shadow: rgba(0, 0, 0, 0.06);

  /* 类苹果极简：系统字体优先 */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.page {
  min-height: calc(100vh - 72px);
  display: grid;
  place-items: center;
  padding: 48px 20px 24px;
}

.card {
  width: min(680px, 100%);
  text-align: center;
  padding: 44px 28px;
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 16px 48px var(--shadow);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
}

.title {
  font-size: clamp(28px, 3.4vw, 40px);
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.2;
}

.subtitle {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.clock {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--text);
}

.footer {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 20px 24px;
}

.beian {
  color: rgba(17, 17, 17, 0.5);
  text-decoration: none;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

.beian:hover {
  color: rgba(17, 17, 17, 0.78);
  text-decoration: underline;
  text-decoration-color: rgba(17, 17, 17, 0.25);
}

.beian:focus-visible {
  outline: 3px solid rgba(10, 132, 255, 0.35);
  outline-offset: 4px;
  border-radius: 10px;
}