*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-light: #64748b;
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Header */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  background: var(--primary);
  color: white;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* Buttons */
.btn {
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover {
  background: var(--bg);
}

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover {
  background: var(--danger-hover);
}

.btn-icon {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  color: var(--text-light);
  border-radius: var(--radius);
}
.btn-icon:hover {
  background: var(--bg);
  color: var(--text);
}

.btn-sm {
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
}

/* Main */
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Calendar header */
.calendar-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.calendar-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  min-width: 200px;
  text-align: center;
  text-transform: capitalize;
}

/* Calendar grid */
.calendar-grid {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.day-name {
  padding: 0.75rem 0.5rem;
  text-align: center;
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-light);
  text-transform: uppercase;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

#calendar-days {
  display: contents;
}

.day-cell {
  min-height: 90px;
  padding: 0.4rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
  position: relative;
}

.day-cell:nth-child(7n) {
  border-right: none;
}

.day-cell:hover {
  background: #f1f5f9;
}

.day-cell.other-month {
  background: #fafafa;
  color: #cbd5e1;
}

.day-cell.today {
  background: #eff6ff;
}

.day-cell.today .day-number {
  background: var(--primary);
  color: white;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.day-number {
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.day-event {
  font-size: 0.7rem;
  padding: 0.15rem 0.35rem;
  margin-bottom: 0.15rem;
  border-radius: 3px;
  background: #dbeafe;
  color: #1e40af;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.day-event.repos {
  background: #dcfce7;
  color: #166534;
}

.day-event-more {
  font-size: 0.65rem;
  color: var(--text-light);
  padding-left: 0.35rem;
}

/* Day detail panel */
.day-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 1rem;
  padding: 1.25rem;
}

.day-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.day-detail-header h3 {
  font-size: 1.1rem;
}

.event-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.event-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

.event-info .event-time {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.15rem;
}

.event-info .event-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.event-actions {
  display: flex;
  gap: 0.25rem;
}

.no-events {
  color: var(--text-light);
  font-size: 0.9rem;
  padding: 1rem 0;
  text-align: center;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-header h3 {
  font-size: 1.1rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  color: var(--text-light);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(37,99,235,0.15);
}

.form-row {
  display: flex;
  gap: 1rem;
}

.form-row .form-group {
  flex: 1;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 1.25rem;
}

.error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.hidden {
  display: none !important;
}

/* Week summary colors */
.week-summary {
  margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 640px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  header h1 {
    font-size: 1.05rem;
  }

  .calendar-header h2 {
    font-size: 1rem;
    min-width: auto;
  }

  .day-cell {
    min-height: 60px;
    padding: 0.25rem;
  }

  .day-number {
    font-size: 0.75rem;
  }

  .day-event {
    font-size: 0.6rem;
  }

  .day-name {
    font-size: 0.65rem;
    padding: 0.5rem 0.2rem;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }
}