:root {
  --bg: #0d1117;
  --panel: #161b22;
  --line: #262d36;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-2: #2ea043;
}

[data-theme='light'] {
  --bg: #f6f8fa;
  --panel: #ffffff;
  --line: #d0d7de;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #0969da;
  --accent-2: #1a7f37;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 40px 18px;
  background: radial-gradient(1200px 600px at 15% -10%, rgba(88, 166, 255, 0.16), transparent), var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  transition: background 0.25s, color 0.25s;
}

.shell {
  max-width: 760px;
  margin: 0 auto;
}

.kicker {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 30px;
}

.lead {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px;
  display: grid;
  gap: 22px;
}

.clock {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

#clock-time {
  font-size: 42px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.date {
  color: var(--muted);
  font-size: 14px;
}

.counter {
  display: flex;
  align-items: center;
  gap: 16px;
}

.counter button {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.counter button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#count {
  min-width: 90px;
  text-align: center;
  font-size: 32px;
  font-variant-numeric: tabular-nums;
}

.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.ghost {
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.ghost:hover {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.meta {
  margin: 0;
  display: grid;
  gap: 10px;
  border-top: 1px dashed var(--line);
  padding-top: 18px;
}

.meta div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
}

.meta dt {
  color: var(--muted);
}

.meta dd {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.foot {
  margin-top: 26px;
  display: flex;
  gap: 20px;
  font-size: 13px;
}

.foot a {
  color: var(--muted);
  text-decoration: none;
}

.foot a:hover {
  color: var(--accent);
}