:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --border: #dde1e6;
  --text: #1f2430;
  --text-muted: #667085;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --highlight-bg: #eef4ff;
  --danger: #d92d20;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1d2026;
    --border: #2c313a;
    --text: #e7e9ec;
    --text-muted: #9aa2b1;
    --accent: #5b8def;
    --accent-contrast: #0b0d10;
    --highlight-bg: #1c2536;
    --danger: #f0453a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.app-header h1 {
  font-size: 1.5rem;
  margin: 0;
}

.calculator-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.calculator-picker select {
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.calculator {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.settings-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 12px;
}

.setting label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.setting input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  font-size: 0.9rem !important;
  color: var(--text) !important;
}

.checkbox-label input {
  width: 16px;
  height: 16px;
}

.hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 16px;
  line-height: 1.4;
}

.time-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 12px;
}

.time-table th {
  text-align: left;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  padding: 0 8px 8px;
  border-bottom: 1px solid var(--border);
}

.time-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

.time-input {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 1rem;
  width: 100%;
}

.time-input:focus-within {
  border-color: var(--accent);
}

.time-input .segment {
  width: 2ch;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
  padding: 2px 0;
}

.time-input .segment::placeholder {
  color: var(--text-muted);
}

.time-input .segment:focus {
  outline: none;
  background: var(--highlight-bg);
  border-radius: 4px;
}

.time-input .colon {
  color: var(--text-muted);
}

.time-input .period-btn {
  margin-left: 4px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  min-width: 3ch;
  text-align: center;
}

.time-input .period-btn.is-guessed {
  color: var(--text-muted);
  font-style: italic;
  border-color: var(--border);
  border-style: dashed;
}

.time-input .period-btn.is-explicit {
  color: var(--accent);
  font-weight: 600;
  border-color: var(--accent);
}

.time-input .period-btn:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.time-input .period-btn:hover {
  background: var(--highlight-bg);
}

.duration-cell {
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  white-space: nowrap;
}

.remove-row {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 4px 8px;
}

.remove-row:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

button.secondary {
  background: var(--surface);
  border: 1px dashed var(--border);
  color: var(--accent);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

button.secondary:hover {
  background: var(--highlight-bg);
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.summary-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.summary-item.highlight {
  background: var(--highlight-bg);
  border-color: var(--accent);
}

.summary-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.summary-value {
  font-size: 1.3rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.summary-item.highlight .summary-value {
  color: var(--accent);
}