/* Custom properties for Light Theme */
:root {
  --bg-app: #f8fafc;
  --bg-sidebar: rgba(255, 255, 255, 0.45);
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  
  --border-color: rgba(203, 213, 225, 0.6);
  --border-color-focus: rgba(79, 70, 229, 0.4);
  
  --text-primary: #0f172a;    /* Slate 900 */
  --text-secondary: #475569;  /* Slate 600 */
  --text-muted: #94a3b8;      /* Slate 400 */
  
  --color-primary: #4f46e5;   /* Modern Indigo */
  --color-primary-hover: #4338ca;
  --color-accent: #0d9488;    /* Teal */
  
  --color-success: #10b981;   /* Green */
  --color-warning: #f59e0b;   /* Amber */
  --color-danger: #ef4444;    /* Coral Red */
  --color-danger-bg: rgba(239, 68, 68, 0.05);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 30px -10px rgba(0, 0, 0, 0.07);
  
  --border-radius-sm: 10px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  
  --font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Global Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.02);
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.25);
}

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 24px;
  gap: 20px;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 28px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
  gap: 16px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 28px;
  color: var(--color-primary);
  background: rgba(79, 70, 229, 0.08);
  padding: 6px;
  border-radius: 12px;
}

.app-header h1 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.accent-text {
  color: var(--color-primary);
}

.tagline {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Select Styling */
.select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.select-icon {
  position: absolute;
  left: 14px;
  color: var(--text-secondary);
  pointer-events: none;
  font-size: 18px;
}

#class-select {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  padding: 10px 24px 10px 40px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: var(--transition-fast);
  appearance: none;
  min-width: 140px;
  box-shadow: var(--shadow-sm);
}

#class-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--border-radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #4338ca 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.25);
  background: linear-gradient(135deg, #6366f1 0%, var(--color-primary) 100%);
}

.btn-secondary {
  background: #fff;
  color: var(--text-secondary);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f8fafc;
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

.btn-danger-outline {
  background: transparent;
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger-outline:hover {
  background: rgba(239, 68, 68, 0.05);
  border-color: var(--color-danger);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-icon {
  background: #fff;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--border-radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
  box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
  background: #f8fafc;
  border-color: var(--text-secondary);
  color: var(--color-primary);
}

/* Main Layout */
.app-main {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  flex: 1;
}

@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

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

.card-title {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title span.material-icons-round {
  color: var(--color-primary);
}

.card-description {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* Subject Palette List */
.subject-palette-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 4px;
}

.palette-item {
  display: flex;
  flex-direction: column;
  padding: 12px;
  border-radius: var(--border-radius-sm);
  background: #fff;
  border: 1px solid var(--border-color);
  cursor: grab;
  position: relative;
  transition: all var(--transition-normal);
  user-select: none;
  box-shadow: var(--shadow-sm);
}

.palette-item:hover {
  background: #faf5ff;
  border-color: var(--border-color-focus);
  transform: translateX(3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.palette-item:active {
  cursor: grabbing;
}

.palette-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.palette-item-name-area {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.color-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.btn-edit-subject-inline {
  opacity: 0;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
}

.palette-item:hover .btn-edit-subject-inline {
  opacity: 1;
}

.btn-edit-subject-inline:hover {
  color: var(--color-primary);
}

.palette-item-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-secondary);
}

/* Custom Progress Bar */
.progress-container {
  width: 100%;
  height: 6px;
  background: #f1f5f9;
  border-radius: 3px;
  margin-top: 8px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  transition: width var(--transition-normal) ease;
}

.progress-success {
  background: var(--color-success);
}

.progress-warning {
  background: var(--color-warning);
}

.progress-danger {
  background: var(--color-danger);
}

/* Warnings Sidebar */
.warning-list-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 250px;
  overflow-y: auto;
}

.warning-item {
  display: flex;
  gap: 10px;
  padding: 10px;
  border-radius: var(--border-radius-sm);
  align-items: flex-start;
  font-size: 12px;
  line-height: 1.4;
  animation: fadeIn var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.warning-item-danger {
  background: #fef2f2;
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #991b1b;
}

.warning-item-warning {
  background: #fffbeb;
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: #92400e;
}

.warning-item .warning-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.warning-item-danger .warning-icon {
  color: var(--color-danger);
}

.warning-item-warning .warning-icon {
  color: var(--color-warning);
}

.warning-text {
  color: inherit;
}

.warning-text strong {
  font-weight: 700;
}

.no-warnings {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  color: var(--text-secondary);
  gap: 8px;
  text-align: center;
}

.no-warnings span {
  font-size: 32px;
  color: var(--color-success);
}

/* Trash Drop Zone */
.trash-zone {
  border: 2px dashed rgba(239, 68, 68, 0.3);
  border-radius: var(--border-radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: rgba(239, 68, 68, 0.01);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.trash-zone.dragover {
  border-color: var(--color-danger);
  background: rgba(239, 68, 68, 0.05);
  color: #991b1b;
  transform: scale(1.02);
}

.trash-zone.dragover .trash-icon {
  animation: wiggle 0.4s infinite alternate;
  color: var(--color-danger);
}

.trash-icon {
  font-size: 28px;
}

.trash-text {
  font-size: 11px;
  font-weight: 600;
}

/* Timetable Main Area */
.timetable-section {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.timetable-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

.timetable-header-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 4px;
}

.timetable-legend {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.color-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

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

.color-empty {
  border: 1px dashed var(--text-muted);
}

.weeks-info-badge {
  background: #fff;
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.weeks-info-badge .label {
  color: var(--text-secondary);
  margin-right: 4px;
}

.weeks-info-badge .value {
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 800;
}

/* Timetable Table Grid */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--border-radius-sm);
}

.timetable-grid {
  width: 100%;
  border-collapse: separate;
  border-spacing: 8px;
  table-layout: fixed;
  min-width: 750px;
}

.timetable-grid th, .timetable-grid td {
  text-align: center;
  vertical-align: middle;
}

.timetable-grid th {
  background: #f8fafc;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 700;
  padding: 12px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
}

.timetable-grid th.col-period {
  width: 70px;
  background: transparent;
  border: none;
}

.timetable-grid td.period-label {
  background: #f8fafc;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 800;
  padding: 14px 6px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
}

/* Timetable Slots */
.timetable-slot {
  height: 85px;
  background: rgba(255, 255, 255, 0.4);
  border: 1.5px dashed rgba(203, 213, 225, 0.8);
  border-radius: var(--border-radius-sm);
  padding: 6px;
  transition: all var(--transition-normal);
  position: relative;
}

.timetable-slot:hover {
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(79, 70, 229, 0.3);
}

.timetable-slot.dragover {
  background: rgba(79, 70, 229, 0.04);
  border-color: var(--color-primary);
}

/* Cards inside slots */
.subject-card {
  width: 100%;
  height: 100%;
  border-radius: var(--border-radius-sm);
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  cursor: grab;
  user-select: none;
  position: relative;
  transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
  border: 1px solid rgba(226, 232, 240, 0.8);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.subject-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.subject-card:active {
  cursor: grabbing;
}

.card-dragging {
  opacity: 0.4;
  transform: scale(0.95);
}

.subject-card .subject-name {
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 13px;
}

.subject-card .card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  font-size: 10px;
  font-weight: 600;
}

/* Conflict Indicator inside slot */
.subject-card.has-conflict {
  background-color: #fef2f2 !important; /* Soft Red Background */
  border-left: 4px solid var(--color-danger) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
}

.subject-card.has-conflict .subject-name {
  color: #991b1b !important;
}

.subject-card.has-conflict .card-bottom {
  color: #991b1b !important;
}

.subject-card .warning-badge {
  display: inline-flex;
  align-items: center;
  color: var(--color-danger);
  font-size: 16px;
  cursor: help;
}

/* Modals Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.3);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  width: 100%;
  max-width: 500px;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
  color: var(--text-primary);
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 800;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Forms styling */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row {
  display: flex;
  gap: 16px;
}

.col-6 {
  flex: 0 0 calc(50% - 8px);
}

label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
}

input[type="text"], input[type="number"], select {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  outline: none;
  transition: all var(--transition-fast);
}

input[type="text"]:focus, input[type="number"]:focus, select:focus {
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.form-help {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Radio Group */
.radio-group {
  display: flex;
  gap: 14px;
  margin-top: 4px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.radio-label input[type="radio"] {
  accent-color: var(--color-primary);
}

.warning-callout {
  background: #fef3c7;
  border-left: 3px solid var(--color-warning);
  padding: 12px;
  border-radius: 4px;
  display: flex;
  gap: 10px;
  font-size: 12px;
  line-height: 1.4;
  color: #92400e;
}

.warning-callout span {
  color: var(--color-warning);
  font-size: 18px;
}

/* Color Selection in Edit Subject */
.color-palette-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.color-dot-select {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.color-dot-select:hover {
  transform: scale(1.15);
}

.color-dot-select.selected {
  border-color: var(--text-primary);
  transform: scale(1.15);
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.modal-footer-right {
  display: flex;
  gap: 10px;
}

.style-hidden {
  display: none !important;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 16px;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  margin-top: 20px;
}

/* Keyframes animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes wiggle {
  0% { transform: rotate(-3deg); }
  100% { transform: rotate(3deg); }
}

/* Cloud Sync Status Styling */
.sync-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition-normal);
  margin-right: 8px;
  box-shadow: var(--shadow-sm);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: all var(--transition-normal);
}

/* Loading/Connecting State */
.status-loading .status-dot {
  background: var(--color-warning);
}
.status-loading .status-text {
  color: var(--text-secondary);
}

/* Success State */
.status-success .status-dot {
  background: var(--color-success);
}
.status-success .status-text {
  color: var(--text-primary);
}

/* Saving State */
.status-saving .status-dot {
  background: #3b82f6; /* Bright Blue */
}
.status-saving .status-text {
  color: var(--text-primary);
}

/* Error / Offline State */
.status-error .status-dot {
  background: var(--color-danger);
}
.status-error .status-text {
  color: var(--color-danger);
}

/* Master Management Modal Custom Styles */
.modal-large {
  max-width: 680px;
  width: 95%;
}

.master-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 600px) {
  .master-columns {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.master-col h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 6px;
}

.master-input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.master-input-group input {
  flex: 1;
  background: #f8fafc;
}

.master-list {
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
  padding-right: 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.master-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.master-item:hover {
  background: #f8fafc;
  border-color: var(--text-secondary);
}

.btn-delete-master {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: color var(--transition-fast);
}

.btn-delete-master:hover {
  color: var(--color-danger);
}

/* View switcher & Day selector tab styles */
.view-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  gap: 16px;
  flex-wrap: wrap;
  width: 100%;
}

.toggle-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.04);
  padding: 4px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  gap: 2px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn span.material-icons-round {
  font-size: 18px;
}

.tab-btn.active {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.3);
}

.day-selector-area {
  display: flex;
}

.day-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.04);
  padding: 4px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  gap: 4px;
}

.day-tab {
  border: none;
  background: transparent;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.day-tab.active {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.day-tab:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.3);
}

/* Class Tab Bar Styles */
.class-selector-wrapper {
  display: flex;
  align-items: center;
}

.class-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.04);
  padding: 4px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  gap: 4px;
}

.class-tab {
  border: 1px solid transparent;
  background: transparent;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.class-tab.active {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.class-tab:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.3);
}

/* Drag hover indicators for tabs switching */
.class-tab.dragover-hover, .day-tab.dragover-hover {
  background: rgba(79, 70, 229, 0.08) !important;
  border: 1px dashed var(--color-primary) !important;
  color: var(--color-primary) !important;
  transform: scale(1.04);
}