/* ==========================================================================
   Components — Apple-style UI Kit
   ========================================================================== */

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius-full);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.btn:focus-visible {
  outline: 3px solid rgba(0, 113, 227, 0.4);
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.97);
}

/* Primary */
.btn-primary {
  background-color: var(--accent-blue);
  color: #FFFFFF;
}

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

/* Secondary */
.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

/* Danger */
.btn-danger {
  background-color: var(--status-red);
  color: #FFFFFF;
}

.btn-danger:hover {
  opacity: 0.88;
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--accent-blue);
}

.btn-ghost:hover {
  background-color: var(--sidebar-active);
}

/* Sizes */
.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* Icon-only variant */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-icon.btn-sm {
  width: 28px;
  height: 28px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

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

.card-header h3,
.card-header h4 {
  margin: 0;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

/* ==========================================================================
   Badges / Status
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  white-space: nowrap;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.badge-success {
  background: rgba(52, 199, 89, 0.12);
  color: var(--status-green);
}

.badge-warning {
  background: rgba(255, 159, 10, 0.12);
  color: var(--status-yellow);
}

.badge-danger {
  background: rgba(255, 59, 48, 0.12);
  color: var(--status-red);
}

.badge-info {
  background: rgba(0, 113, 227, 0.1);
  color: var(--accent-blue);
}

[data-theme="dark"] .badge-success {
  background: rgba(52, 199, 89, 0.18);
}

[data-theme="dark"] .badge-warning {
  background: rgba(255, 159, 10, 0.18);
}

[data-theme="dark"] .badge-danger {
  background: rgba(255, 59, 48, 0.18);
}

[data-theme="dark"] .badge-info {
  background: rgba(41, 151, 255, 0.18);
}

/* ==========================================================================
   Tables
   ========================================================================== */

.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--card-bg);
}

table.data-table {
  width: 100%;
  font-size: 14px;
}

table.data-table thead {
  background: var(--bg-secondary);
}

table.data-table th {
  padding: 12px var(--spacing-md);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--border-color);
}

table.data-table td {
  padding: 14px var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

table.data-table tbody tr:last-child td {
  border-bottom: none;
}

table.data-table tbody tr {
  transition: background-color var(--transition);
}

table.data-table tbody tr:hover {
  background-color: var(--bg-secondary);
}

[data-theme="dark"] table.data-table tbody tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] table.data-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--spacing-md);
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--text-primary);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus {
  box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.2);
}

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

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8.825a.5.5 0 0 1-.354-.146L2.354 5.387a.5.5 0 1 1 .708-.708L6 7.617l2.938-2.938a.5.5 0 0 1 .708.708L6.354 8.68a.5.5 0 0 1-.354.146Z' fill='%2386868B'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: 12px;
  color: var(--text-tertiary);
}

.form-error {
  font-size: 12px;
  color: var(--status-red);
}

/* ==========================================================================
   Stat Cards
   ========================================================================== */

.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
}

.stat-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--sidebar-active);
  color: var(--accent-blue);
  font-size: 18px;
}

.stat-card-value {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.stat-card-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.stat-card-trend {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
}

.stat-card-trend.up {
  color: var(--status-green);
}

.stat-card-trend.down {
  color: var(--status-red);
}

/* ==========================================================================
   Progress Bar
   ========================================================================== */

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent-blue);
  transition: width 0.6s ease;
}

.progress-fill.green {
  background: var(--status-green);
}

.progress-fill.yellow {
  background: var(--status-yellow);
}

.progress-fill.red {
  background: var(--status-red);
}

/* ==========================================================================
   Avatar
   ========================================================================== */

.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  flex-shrink: 0;
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm {
  width: 28px;
  height: 28px;
  font-size: 11px;
}

.avatar-lg {
  width: 56px;
  height: 56px;
  font-size: 20px;
}

/* ==========================================================================
   Dropdown
   ========================================================================== */

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 1000;
  min-width: 200px;
  padding: var(--spacing-xs) 0;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all var(--transition);
}

[data-theme="dark"] .dropdown-menu {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color var(--transition);
}

.dropdown-item:hover {
  background-color: var(--bg-secondary);
}

.dropdown-item.danger {
  color: var(--status-red);
}

.dropdown-divider {
  height: 1px;
  margin: var(--spacing-xs) 0;
  background: var(--border-color);
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  background: var(--overlay-bg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

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

.modal {
  width: 100%;
  max-width: 520px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.2);
  transform: scale(0.96) translateY(8px);
  transition: transform var(--transition-slow);
  overflow: hidden;
}

[data-theme="dark"] .modal {
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

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

.modal-header h3 {
  margin: 0;
  font-size: 18px;
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: background-color var(--transition);
}

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

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Tabs
   ========================================================================== */

.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
}

.tab-item {
  position: relative;
  padding: 12px var(--spacing-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--transition);
  border: none;
  background: none;
}

.tab-item::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  border-radius: 2px 2px 0 0;
  transition: background-color var(--transition);
}

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

.tab-item.active {
  color: var(--accent-blue);
  font-weight: 600;
}

.tab-item.active::after {
  background: var(--accent-blue);
}

/* ==========================================================================
   Search Input
   ========================================================================== */

.search-input {
  position: relative;
}

.search-input::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2386868B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  pointer-events: none;
}

.search-input input {
  width: 100%;
  padding: 10px 14px 10px 40px;
  font-size: 14px;
  color: var(--text-primary);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.search-input input::placeholder {
  color: var(--text-tertiary);
}

/* ==========================================================================
   Toggle Switch
   ========================================================================== */

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 26px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-switch .toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--transition);
}

.toggle-switch .toggle-slider::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent-blue);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(18px);
}

.toggle-switch input:focus-visible + .toggle-slider {
  outline: 3px solid rgba(0, 113, 227, 0.4);
  outline-offset: 2px;
}

/* ==========================================================================
   Timeline
   ========================================================================== */

.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--border-color);
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-lg);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid var(--card-bg);
  box-shadow: 0 0 0 2px var(--accent-blue);
}

.timeline-item.completed::before {
  background: var(--status-green);
  box-shadow: 0 0 0 2px var(--status-green);
}

.timeline-item.pending::before {
  background: var(--bg-tertiary);
  box-shadow: 0 0 0 2px var(--border-color);
}

.timeline-item-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.timeline-item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.timeline-item-desc {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
  text-align: center;
}

.empty-state-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  font-size: 28px;
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.empty-state-message {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 360px;
  margin-bottom: var(--spacing-lg);
}

/* ==========================================================================
   Tooltip
   ========================================================================== */

.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: #FFFFFF;
  background: var(--text-primary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all var(--transition);
  z-index: 2000;
}

.tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   Tag / Chip
   ========================================================================== */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.tag-blue {
  color: var(--accent-blue);
  background: var(--sidebar-active);
}

.tag-green {
  color: var(--status-green);
  background: rgba(52, 199, 89, 0.12);
}

.tag-removable .tag-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-left: 2px;
  font-size: 10px;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color var(--transition);
}

.tag-removable .tag-remove:hover {
  background: rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   Notification dot
   ========================================================================== */

.notification-dot {
  position: relative;
}

.notification-dot::after {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-red);
  border: 2px solid var(--card-bg);
}