/* ========================================
   Design System: Meeting Room Booking
   ======================================== */

:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-active: #1e40af;
  --color-primary-light: #eff6ff;
  --color-success: #16a34a;
  --color-success-light: #f0fdf4;
  --color-warning: #d97706;
  --color-warning-light: #fffbeb;
  --color-error: #dc2626;
  --color-error-light: #fef2f2;
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-border: #e5e7eb;
  --color-border-focus: #2563eb;
  --color-surface: #ffffff;
  --color-background: #f3f4f6;
  --color-overlay: rgba(0, 0, 0, 0.45);

  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

img {
  max-width: 100%;
  display: block;
}

/* Layout */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.page-content {
  flex: 1;
  padding: var(--space-6) 0;
}

/* Header */
#app-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.main-nav {
  display: flex;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--color-background);
  color: var(--color-text);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.role-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.role-badge.employee {
  background-color: var(--color-background);
  color: var(--color-text-secondary);
}

.role-badge.office_manager {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.role-badge.admin {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.user-id {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Page Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
}

.page-subtitle {
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              opacity var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled,
.btn.loading {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--color-primary-active);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-background);
  border-color: var(--color-text-muted);
}

.btn-danger {
  background-color: var(--color-error);
  color: var(--color-surface);
}

.btn-danger:hover:not(:disabled) {
  background-color: #b91c1c;
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-primary-light);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-md);
}

/* Spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
}

.card-body {
  padding: var(--space-5);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-label-required::after {
  content: ' *';
  color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-error);
}

.form-hint {
  margin-top: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* Checkbox */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--font-size-base);
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* Filters */
#room-filters {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.filter-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.filter-field label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.filter-input {
  width: 120px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.filter-checkboxes {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  padding-bottom: var(--space-1);
}

/* Room Grid */
#rooms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

.room-card {
  composes: card card-hover;
  display: flex;
  flex-direction: column;
}

.room-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.room-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.room-card-capacity {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-background);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

.room-card-location {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-sm);
}

.room-card-equipment {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.equipment-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.room-card-actions {
  margin-top: auto;
  display: flex;
  gap: var(--space-3);
}

.room-card-actions .btn {
  flex: 1;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.pagination-btn {
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-weight: var(--font-weight-medium);
}

.pagination-btn:hover:not(:disabled) {
  background-color: var(--color-background);
}

.pagination-btn.active {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-color: var(--color-primary);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Schedule */
#schedule-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  gap: var(--space-3);
}

#schedule-date-picker {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

#schedule-timeline {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) 0;
}

.schedule-slot {
  display: flex;
  min-height: 48px;
  border-bottom: 1px solid var(--color-border);
}

.schedule-slot:last-child {
  border-bottom: none;
}

.schedule-time {
  width: 80px;
  flex-shrink: 0;
  text-align: right;
  padding-right: var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.schedule-cell {
  flex: 1;
  position: relative;
  border-left: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.schedule-cell:hover {
  background-color: var(--color-background);
}

.schedule-booking {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  font-size: var(--font-size-sm);
  overflow: hidden;
  z-index: 1;
}

.schedule-booking.cancelled {
  background-color: var(--color-text-muted);
  text-decoration: line-through;
}

.schedule-booking-title {
  font-weight: var(--font-weight-medium);
}

.schedule-booking-time {
  opacity: 0.9;
  font-size: var(--font-size-xs);
}

/* Bookings List */
#bookings-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.tab-btn {
  padding: var(--space-2) var(--space-4);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

#bookings-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.booking-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  flex-wrap: wrap;
}

.booking-item-info {
  flex: 1;
  min-width: 200px;
}

.booking-item-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.booking-item-meta {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.booking-item-status {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.booking-item-status.upcoming {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.booking-item-status.past {
  background-color: var(--color-background);
  color: var(--color-text-secondary);
}

.booking-item-status.cancelled {
  background-color: var(--color-error-light);
  color: var(--color-error);
}

.booking-item-actions {
  display: flex;
  gap: var(--space-2);
}

/* Admin Table */
#admin-rooms-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

#admin-rooms-table th,
#admin-rooms-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

#admin-rooms-table th {
  background-color: var(--color-background);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

#admin-rooms-table tr:last-child td {
  border-bottom: none;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: var(--space-2);
}

.status-dot.active {
  background-color: var(--color-success);
}

.status-dot.inactive {
  background-color: var(--color-text-muted);
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(-8px);
  transition: transform var(--transition-base);
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-background);
  color: var(--color-text);
}

.modal-body {
  padding: var(--space-5);
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-background);
}

/* Alert */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.alert-error {
  background-color: var(--color-error-light);
  color: var(--color-error);
  border: 1px solid rgba(220, 38, 38, 0.2);
}

.alert-warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.alert-success {
  background-color: var(--color-success-light);
  color: var(--color-success);
  border: 1px solid rgba(22, 163, 74, 0.2);
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-10) var(--space-4);
  background-color: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

.empty-state-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.empty-state-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  max-width: 400px;
}

/* Skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--color-background) 25%, #e5e7eb 50%, var(--color-background) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 16px;
  margin-bottom: var(--space-2);
}

.skeleton-title {
  height: 20px;
  width: 60%;
  margin-bottom: var(--space-3);
}

/* Page sections visibility helper */
.page-section {
  display: none;
}

.page-section.active {
  display: block;
}

/* Utilities */
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-error { color: var(--color-error); }
.text-success { color: var(--color-success); }
.text-center { text-align: center; }
.font-semibold { font-weight: var(--font-weight-semibold); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.w-full { width: 100%; }
.hidden { display: none; }

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: var(--space-3) 0;
    gap: var(--space-3);
  }

  .main-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: var(--space-2);
  }

  .user-info {
    margin-left: auto;
  }

  #room-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-input {
    width: 100%;
  }

  .filter-checkboxes {
    flex-wrap: wrap;
  }

  #rooms-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .booking-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .booking-item-actions {
    width: 100%;
  }

  .booking-item-actions .btn {
    flex: 1;
  }

  #admin-rooms-table {
    display: block;
    overflow-x: auto;
  }

  .modal {
    max-height: 100vh;
    border-radius: 0;
  }
}