:root {
  --bg: #12151c;
  --panel: #1a1f2b;
  --panel-2: #222838;
  --line: #2c3446;
  --fg: #e8edf8;
  --muted: #8b98b4;
  --accent: #4fd1c5;
  --accent-dark: #2aa79c;
  --warn: #e0a355;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 18px 20px 26px;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, #1d2432, #171c27);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
}

h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.sub {
  margin: 3px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.readout {
  text-align: right;
}

.readout-time {
  font-family: Consolas, 'Cascadia Mono', monospace;
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1.1;
  color: var(--accent);
}

.readout-meta {
  font-size: 12px;
  color: var(--muted);
}

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}

.card {
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}

.wide-card {
  grid-column: 1 / -1;
}

h2 {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.row + .row {
  margin-top: 12px;
}

.row.wrap {
  flex-wrap: wrap;
}

.stack-tight {
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.field + .field {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.field-label {
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--muted);
}

.btn {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-2);
  color: var(--fg);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.06s ease;
}

.btn:hover {
  background: #2a3244;
  border-color: #3b465e;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #06231f;
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary.is-on {
  background: #3a2a33;
  border-color: #6b3a44;
  color: #ffb3bd;
}

.btn-primary.is-on:hover {
  background: #4a333e;
}

.btn-warn {
  border-color: #6b5326;
  color: #f0c37a;
}

/* 暂停中要一眼看出来，否则用户会以为时钟坏了 */
.btn-warn.is-on {
  background: #3b2f1a;
  border-color: var(--warn);
  color: #ffd79a;
  font-weight: 600;
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
}

.btn-chip {
  padding: 6px 11px;
  font-size: 12.5px;
}

.btn.seg {
  flex: 1;
  padding: 10px 14px;
}

.btn.seg.is-active {
  background: var(--accent-dark);
  border-color: var(--accent);
  color: #06231f;
  font-weight: 600;
}

.segmented {
  display: flex;
  gap: 10px;
}

.wide {
  width: 100%;
  padding: 11px 14px;
  font-size: 14px;
}

.input {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #0f131b;
  color: var(--fg);
  font-family: Consolas, 'Cascadia Mono', monospace;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.input:focus {
  outline: none;
  border-color: var(--accent-dark);
}

.num {
  width: 62px;
  text-align: center;
}

.wide-num {
  width: 96px;
}

.time-inputs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.colon {
  color: var(--muted);
  font-size: 16px;
}

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  color: var(--fg);
}

.check input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-dark);
  cursor: pointer;
}

.hint {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
}

.presets {
  margin-top: 10px;
}

@media (max-width: 820px) {
  .grid {
    grid-template-columns: 1fr;
  }
}