:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #222;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-weak: #dbeafe;
  --danger: #dc2626;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans TC", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1.2fr 1fr;
}

.app-header {
  grid-column: 1 / -1;
}

.app-header h1 {
  margin: 0 0 0.3rem;
  font-size: 1.6rem;
}

.today-hint {
  margin: 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.calendar-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.calendar-toolbar h2 {
  margin: 0;
  font-size: 1.25rem;
}

button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  font: inherit;
}

button:hover {
  border-color: #c7d2fe;
}

.calendar-toolbar button {
  width: 40px;
  height: 40px;
  padding: 0;
  font-size: 1.1rem;
}

.weekday-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  margin: 0.8rem 0 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.35rem;
}

.day-cell {
  min-height: 74px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.35rem;
  text-align: left;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.day-cell.other-month {
  color: #9ca3af;
  background: #fafafa;
}

.day-cell.today {
  border-color: var(--primary);
}

.day-cell.selected {
  background: var(--primary-weak);
  border-color: var(--primary);
}

.day-cell.holiday {
  border-color: #fca5a5;
  background: #fff7f7;
}

.day-cell.weekend .day-number {
  color: #b91c1c;
}

.day-number {
  font-weight: 600;
  font-size: 0.95rem;
}

.holiday-name {
  font-size: 0.72rem;
  color: #b91c1c;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.event-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--primary);
}

.event-list {
  list-style: none;
  margin: 0.85rem 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.event-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem;
  display: grid;
  gap: 0.45rem;
}

.event-item h5 {
  margin: 0;
  font-size: 1rem;
}

.event-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.event-actions {
  display: flex;
  gap: 0.4rem;
}

.event-actions button {
  padding: 0.3rem 0.65rem;
  font-size: 0.9rem;
}

.danger {
  border-color: #fecaca;
  color: var(--danger);
}

.event-form {
  display: grid;
  gap: 0.45rem;
}

.event-form h4 {
  margin: 0.25rem 0;
}

input,
textarea {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.55rem;
  font: inherit;
  width: 100%;
}

textarea {
  resize: vertical;
}

.form-actions {
  margin-top: 0.3rem;
  display: flex;
  gap: 0.55rem;
}

#saveEventBtn {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.secondary {
  background: #f9fafb;
}

.sub-hint {
  margin: 0.2rem 0 0.6rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.empty-text {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.8rem;
  color: var(--muted);
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .day-cell {
    min-height: 64px;
    padding: 0.3rem;
  }

  .day-number {
    font-size: 0.85rem;
  }
}