* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0d1117;
  color: #e6edf3;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: min(92vw, 440px);
  padding: 32px;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  text-align: center;
}

h1 {
  margin: 0 0 20px;
  font-size: 1.4rem;
}

.clock {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 3rem;
  letter-spacing: 2px;
  color: #58a6ff;
  font-variant-numeric: tabular-nums;
}

.tz {
  margin: 4px 0 24px;
  font-size: 0.85rem;
  color: #8b949e;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: left;
}

.checklist li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid #21262d;
}

.box {
  flex: none;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #238636;
  color: #fff;
  border-radius: 5px;
  font-size: 0.85rem;
}