:root {
    --primary-color: #f97316;
    --primary-hover: #ea580c;
    --primary-light: rgba(249, 115, 22, 0.1);
    --secondary-color: #6b7280;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #e8e8ec;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgb(0 0 0 / 0.08);
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
    --transition: all 0.2s ease;
}

html[data-theme="dark"],
[data-theme="dark"] {
    --background: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: 0 1px 3px rgb(0 0 0 / 0.2);
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.2);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.2);
}

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

html {
    font-size: 85%;
}



#favoritesSection,
#recentSection,
#analyticsSection,
#plannerSection,
#flashcardsSection,
#notesSection,
#progressSection,
#searchResults {
    display: none;
}


.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex !important;
}

.modal-overlay .modal {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 1.5rem;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.modal-overlay .modal.modal-lg {
    max-width: 600px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2,
.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    line-height: 1;
}

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

.modal-body {
    margin-bottom: 1rem;
}

.modal-footer {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}


.modal-overlay:not(.active) {
    display: none !important;
}


body > h2:not(.section-title),
body > h3,
body > label,
body > input:not([type="checkbox"]),
body > select,
body > textarea {
    display: none !important;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    transition: background-color 0.2s ease, color 0.2s ease;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}


.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    gap: 1rem;
    flex-wrap: wrap;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
    min-width: 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.25rem;
}

.logo-icon {
    width: 1.5rem;
    height: 1.5rem;
    object-fit: contain;
}


.mobile-menu-toggle,
#mobileMenuToggle {
    display: none;
}

.nav-links {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.nav-links::-webkit-scrollbar {
    display: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 0.5rem;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.85rem;
    white-space: nowrap;
}

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

.nav-link i {
    font-size: 0.9rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    width: 200px;
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
    width: 240px;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    pointer-events: none;
}

.accessibility-toggle,
.theme-toggle,
.download-btn {
    background: var(--surface-hover);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    flex-shrink: 0;
}

.accessibility-toggle:hover,
.theme-toggle:hover,
.download-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.download-dropdown-container {
    position: relative;
}

.download-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 280px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    z-index: 1000;
    display: none;
    animation: dropdownFadeIn 0.2s ease;
}

.download-dropdown.active {
    display: block;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.download-dropdown-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.download-dropdown-header i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.download-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 1rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.download-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
}

.download-option:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.download-option i {
    font-size: 1rem;
    color: var(--primary-color);
}

.update-check-btn {
    background: var(--surface-hover);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    flex-shrink: 0;
}

.update-check-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.update-check-btn.checking {
    animation: spin 1s linear infinite;
}

.update-check-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: var(--surface-hover);
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    font-size: 0.8rem;
    white-space: nowrap;
}

.admin-badge {
    background: var(--warning-color);
    color: white;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}


.login-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--background);
    padding: 2rem;
}

.login-card {
    background: var(--surface);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 420px;
    border: 1px solid var(--border);
}

.login-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}


.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
}

.login-header p {
    color: var(--text-secondary);
    margin: 0;
}

.login-credentials {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--primary-light);
    border-radius: 0.75rem;
    border: 1px solid var(--primary-color);
}

.login-credentials p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.login-credentials p:first-child {
    margin-top: 0;
    color: var(--primary-color);
}

.login-credentials code {
    background: var(--surface-hover);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
}

.login-credentials i {
    width: 20px;
    color: var(--primary-color);
}


.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input-container {
    position: relative;
    width: 100%;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: var(--surface);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.input-hint {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--primary-color);
    background: var(--surface);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    border: 1px solid var(--primary-color);
    pointer-events: none;
}

.form-input:focus + .input-hint {
    opacity: 0;
}

.remember-me-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background: var(--surface-hover);
    border: 1px solid var(--border);
}

.remember-checkbox {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 4px;
    background: var(--surface);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.remember-checkbox:checked {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.remember-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.remember-text {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}


.form-group.checkbox-group {
  display: flex;
  align-items: center;
  margin: 1.25rem 0;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-secondary);
  -webkit-user-select: none;
  user-select: none;
  padding: 0.75rem 1rem;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  width: 100%;
}

.checkbox-label:hover {
  border-color: var(--primary-color);
  background: var(--primary-light);
}

.checkbox-label input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  min-width: 22px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
  margin: 0;
}

.checkbox-label input[type="checkbox"]:checked {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2.5px 2.5px 0;
  transform: translate(-50%, -60%) rotate(45deg) scale(0);
  transition: transform 0.15s ease;
}

.checkbox-label input[type="checkbox"]:checked::after {
  transform: translate(-50%, -60%) rotate(45deg) scale(1);
}

.checkbox-label:hover input[type="checkbox"] {
  border-color: var(--primary-color);
}

.checkbox-label > span {
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.2;
}

.checkbox-label:hover > span {
  color: var(--primary-color);
}


.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
}

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

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 0.375rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    transition: var(--transition);
}

.btn-sm:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}


.error-message {
    background: #fef2f2;
    color: var(--danger-color);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    display: none;
    border: 1px solid #fecaca;
    font-size: 0.9rem;
}

[data-theme="dark"] .error-message {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.auto-login-notification {
    background: #f0fdf4;
    color: #003d17;
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    border: 1px solid #004d1b;
}

[data-theme="dark"] .auto-login-notification {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(0, 90, 33, 0.3);
    color: #003d17;
}

#logoutSection {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    text-align: center;
    margin-top: 1.5rem;
}


.tiles-grid,
#tilesContainer {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.tiles-grid.list-view,
#tilesContainer.list-view {
    display: block;
}

.tiles-grid.list-view .tile,
#tilesContainer.list-view .tile {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    text-align: left;
    margin-bottom: 0.75rem;
    padding: 1rem 1.5rem;
    min-height: auto;
}

.tiles-grid.list-view .tile-icon,
#tilesContainer.list-view .tile-icon {
    font-size: 1.5rem;
    margin-bottom: 0;
    margin-right: 1rem;
}

.tiles-grid.list-view .tile-text,
#tilesContainer.list-view .tile-text {
    font-size: 1rem;
    flex: 1;
}

.tile {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    position: relative;
    box-shadow: var(--shadow);
    transition: var(--transition);
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.tile:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

.tile-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.tile:hover .tile-icon {
    color: var(--primary-hover);
}

.tile-text {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.tile-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: var(--text-secondary);
    color: white;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    font-size: 0.65rem;
    font-weight: 600;
}

.tile-favorite {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.25rem;
}

.tile-favorite:hover,
.tile-favorite.active {
    color: #f59e0b;
}

.tile-actions {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: var(--transition);
}

.tile:hover .tile-actions {
    opacity: 1;
}

.tile-action-btn {
    width: 28px;
    height: 28px;
    border-radius: 0.375rem;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: var(--transition);
}

.tile-action-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tile-action-btn.favorite.active {
    background: var(--warning-color);
    border-color: var(--warning-color);
    color: white;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}


.breadcrumb-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    flex-wrap: wrap;
    box-shadow: var(--shadow-sm);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.125rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    flex: 1;
    min-width: 0;
}

.breadcrumb-item {
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.375rem 0.625rem;
    border-radius: 0.375rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-weight: 500;
    text-decoration: none;
    background: var(--primary-light);
    border: 1px solid transparent;
    white-space: nowrap;
}

.breadcrumb-item:hover {
    color: var(--primary-hover);
    background: rgba(249, 115, 22, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.breadcrumb-item:active {
    transform: translateY(0);
}

.breadcrumb-item i {
    font-size: 0.8rem;
}

.breadcrumb-item:last-child {
    color: var(--text-primary);
    font-weight: 600;
    cursor: default;
    background: var(--surface-hover);
    border-color: var(--border);
}

.breadcrumb-item:last-child:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    border-color: var(--border);
    transform: none;
}

.breadcrumb-separator {
    color: var(--text-secondary);
    opacity: 0.6;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    padding: 0 0.125rem;
}

.dashboard-header {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.welcome-section {
    flex: 1;
}

.welcome-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.welcome-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}


.quick-stats {
    display: flex;
    gap: 1rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    min-width: 140px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    background: rgba(249, 115, 22, 0.15);
    color: var(--primary-color);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}


.tiles-section {
    padding: 0;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.section-title i {
    color: var(--primary-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}


.view-toggle,
.sort-toggle {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-toggle:hover,
.view-toggle.active,
.sort-toggle:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}


.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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


.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.95rem;
}


.quick-links-toggle {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
    z-index: 1000;
    transition: var(--transition);
}

.quick-links-toggle:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
}

.quick-links-panel {
    position: fixed;
    bottom: 80px;
    left: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    min-width: 240px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: none;
}

.quick-links-panel.active {
    display: block;
}

.quick-links-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.quick-links-header h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-links-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.quick-links-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.quick-links-list {
    max-height: 250px;
    overflow-y: auto;
}

.quick-link-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.quick-link-item:hover {
    background: var(--surface-hover);
}

.quick-link-item i {
    color: var(--primary-color);
}

.quick-link-delete {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  opacity: 0;
  transition: all 0.2s ease;
}

.quick-link-item:hover .quick-link-delete {
  opacity: 1;
}

.quick-link-delete:hover {
  color: var(--danger-color);
  background: rgba(239, 68, 68, 0.1);
}


.planner-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.5rem;
}

.planner-calendar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

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

.calendar-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.calendar-nav {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.calendar-nav:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: var(--transition);
}

.calendar-day:hover:not(.empty) {
    background: var(--primary-light);
    color: var(--primary-color);
}

.calendar-day.today {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.calendar-day.empty {
    cursor: default;
}

.calendar-day.has-session {
    position: relative;
}

.calendar-day.has-session::after {
    content: '';
    position: absolute;
    bottom: 4px;
    width: 4px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 50%;
}

.planner-sessions {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.planner-sessions h3 {
    margin: 0 0 1rem 0;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}


.flashcards-grid,
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}


.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0;
}

.note-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.25rem;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s ease;
}

.note-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.note-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.note-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.note-card-category {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: 4px;
    text-transform: capitalize;
}

.note-card-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
    min-height: 60px;
}

.note-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
}

.note-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.note-card-actions {
    display: flex;
    gap: 0.5rem;
}

.note-action-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--surface-hover);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.note-action-btn:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.note-action-btn.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}


.flashcards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0;
}

.deck-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

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

.deck-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.deck-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.deck-card-subject {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: 4px;
    text-transform: capitalize;
}

.deck-card-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    padding: 1rem;
    background: var(--background);
    border-radius: 8px;
}

.deck-stat {
    text-align: center;
}

.deck-stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.deck-stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.deck-card-actions {
    display: flex;
    gap: 0.5rem;
}

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


.cards-section {
    margin-top: 1rem;
}

.cards-section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cards-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.card-editor {
    background: var(--background);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border);
}

.card-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.card-editor-number {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.card-editor-delete {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-editor-delete:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.card-editor-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.card-editor-inputs input,
.card-editor-inputs textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    background: var(--surface);
    color: var(--text-primary);
}

.card-editor-inputs textarea {
    resize: vertical;
    min-height: 60px;
}


.modal-study {
    max-width: 600px;
}

.study-body {
    text-align: center;
    padding: 2rem;
}

.flashcard-container {
    perspective: 1000px;
    margin-bottom: 1.5rem;
}

.flashcard {
    width: 100%;
    height: 250px;
    cursor: pointer;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border-radius: 16px;
    font-size: 1.25rem;
    line-height: 1.5;
}

.flashcard-front {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
}

.flashcard-back {
    background: var(--surface);
    border: 2px solid var(--primary-color);
    color: var(--text-primary);
    transform: rotateY(180deg);
}

.study-progress {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.study-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}


.planner-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 1rem 0;
}

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

.calendar-wrapper {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.calendar-month {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.calendar-nav {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--surface-hover);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.calendar-nav:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.calendar-weekdays span {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem 0;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
    background: var(--background);
}

.calendar-day:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

.calendar-day.empty {
    background: transparent;
    cursor: default;
}

.calendar-day.today {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.calendar-day.has-session {
    position: relative;
}

.calendar-day.has-session::after {
    content: '';
    position: absolute;
    bottom: 4px;
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

.calendar-day.today.has-session::after {
    background: white;
}

.sessions-wrapper {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.sessions-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}


.search-history-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  max-height: 300px;
  overflow-y: auto;
  display: none;
  margin-top: 4px;
}

.search-history-dropdown.active {
  display: block;
}

.search-history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.clear-history-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.search-history-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.search-history-item:hover {
  background: var(--surface-hover);
}

.search-history-item i {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.search-history-item span {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-primary);
}


#searchResults {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.search-result-item:hover {
  background: var(--surface-hover);
}

.search-result-item i {
  font-size: 1.25rem;
  color: var(--primary-color);
  width: 24px;
  text-align: center;
}

.search-result-item i.fa-folder {
  color: #f59e0b;
}

.search-result-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.search-result-name {
  font-weight: 500;
  color: var(--text-primary);
}

.search-result-path {
  font-size: 0.8rem;
  color: var(--text-secondary);
}


.session-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  transition: all 0.2s ease;
}

.session-item:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.session-item.completed {
  opacity: 0.6;
}

.session-time {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 50px;
  padding: 8px;
  background: var(--primary-color);
  color: white;
  border-radius: 8px;
}

.session-time-value {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
}

.session-time-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  opacity: 0.9;
}

.session-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.session-subject {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.session-details {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.session-actions {
  display: flex;
  gap: 4px;
}

.session-action-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.session-action-btn.delete:hover {
  background: var(--danger-color);
  border-color: var(--danger-color);
}

#sessionsList {
  display: flex;
  flex-direction: column;
  gap: 8px;
}


.quick-links-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.quick-links-empty i {
  font-size: 1.5rem;
  opacity: 0.5;
}

.quick-link-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}


.accessibility-panel {
  position: fixed;
  top: 70px;
  right: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  min-width: 280px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  display: none;
  flex-direction: column;
  gap: 12px;
}

.accessibility-panel.active {
  display: flex;
}

.accessibility-panel h3 {
  margin: 0 0 8px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.accessibility-option {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  background: var(--surface-hover);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.accessibility-option:hover {
  background: var(--border);
}

.accessibility-option-label {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

.accessibility-switch {
  width: 44px;
  height: 24px;
  background: var(--border);
  border: 2px solid var(--text-secondary);
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.accessibility-switch::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--text-secondary);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.2s ease, background 0.2s ease;
}

.accessibility-switch.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.accessibility-switch.active::after {
  transform: translateX(20px);
  background: white;
}


body.high-contrast {
  --text-primary: #000000 !important;
  --text-secondary: #333333 !important;
  --background: #ffffff !important;
  --surface: #ffffff !important;
  --border: #000000 !important;
}

[data-theme="dark"] body.high-contrast,
body.high-contrast[data-theme="dark"] {
  --text-primary: #ffffff !important;
  --text-secondary: #e0e0e0 !important;
  --background: #000000 !important;
  --surface: #111111 !important;
  --border: #ffffff !important;
}

html.high-contrast,
html.high-contrast body {
  --text-primary: #000000 !important;
  --text-secondary: #333333 !important;
  --background: #ffffff !important;
  --surface: #ffffff !important;
  --border: #000000 !important;
}

html[data-theme="dark"].high-contrast,
html[data-theme="dark"].high-contrast body {
  --text-primary: #ffffff !important;
  --text-secondary: #e0e0e0 !important;
  --background: #000000 !important;
  --surface: #111111 !important;
  --border: #ffffff !important;
}

body.large-text,
html.large-text body {
  font-size: 1.2rem !important;
}

body.large-text .nav-link,
html.large-text .nav-link {
  font-size: 1rem !important;
}

body.large-text .tile-text,
html.large-text .tile-text {
  font-size: 1.3rem !important;
}

body.large-text .btn,
html.large-text .btn {
  font-size: 1.1rem !important;
}

body.large-text h1, body.large-text h2, body.large-text h3,
html.large-text h1, html.large-text h2, html.large-text h3 {
  font-size: 1.5em !important;
}

body.reduced-motion *,
html.reduced-motion * {
  animation: none !important;
  transition: none !important;
}

body.enhanced-focus *:focus,
html.enhanced-focus *:focus {
  outline: 3px solid var(--primary-color) !important;
  outline-offset: 3px !important;
  box-shadow: 0 0 0 6px rgba(249, 115, 22, 0.3) !important;
}



#pdfViewer {
  display: none !important;
  width: 100%;
  height: calc(100vh - 180px);
  min-height: 500px;
  border: none;
  border-radius: 12px;
  background: var(--card-bg);
}

#pdfViewer {
  display: none !important;
}

#pdfViewer.active {
  display: block !important;
  width: 100%;
  height: calc(100vh - 200px);
  min-height: 500px;
  border: none;
  border-radius: 12px;
}

.timer-panel {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 320px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#pdfViewer {
  width: 100%;
  height: calc(100vh - 200px);
  min-height: 500px;
  border: none;
  border-radius: 12px;
  background: var(--surface);
}

.timer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--primary-color);
  color: white;
  cursor: move;
}

.timer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.timer-title i {
  font-size: 1rem;
}

.timer-header-actions {
  display: flex;
  gap: 4px;
}

.timer-header-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.timer-header-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.timer-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--surface);
}

.timer-display-wrapper {
  text-align: center;
}

#timerDisplay {
  font-size: 3rem;
  font-weight: 700;
  font-family: 'Inter', monospace;
  color: var(--text-primary);
  letter-spacing: 2px;
  line-height: 1;
  margin-bottom: 8px;
}

#timerDisplay.warning {
  color: #f59e0b;
}

#timerDisplay.danger {
  color: #ef4444;
  animation: timerPulse 1s infinite;
}

@keyframes timerPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.timer-progress {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}

#timerProgressBar {
  height: 100%;
  background: var(--primary-color);
  border-radius: 3px;
  transition: width 1s linear;
  width: 100%;
}

#timerProgressBar.warning {
  background: #f59e0b;
}

#timerProgressBar.danger {
  background: #ef4444;
}

#timerStatus {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

#timerStatus.active {
  color: #22c55e;
}

#timerStatus.paused {
  color: #f59e0b;
}

#timerStatus.finished {
  color: #ef4444;
  font-weight: 600;
}

.timer-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.timer-preset-btn {
  padding: 8px 14px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--text-primary);
}

.timer-preset-btn:hover {
  background: var(--border);
  border-color: var(--primary-color);
}

.timer-preset-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.timer-preset-btn small {
  font-size: 0.7rem;
  opacity: 0.8;
}

.timer-preset-btn.add-custom {
  width: 40px;
  height: 40px;
  padding: 0;
  justify-content: center;
}

.timer-controls {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.timer-btn {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.timer-btn-start {
  background: #22c55e;
  color: white;
}

.timer-btn-start:hover {
  background: #16a34a;
}

.timer-btn-pause {
  background: #f59e0b;
  color: white;
}

.timer-btn-pause:hover {
  background: #d97706;
}

.timer-btn-resume {
  background: #22c55e;
  color: white;
}

.timer-btn-resume:hover {
  background: #16a34a;
}

.timer-btn-reset {
  background: var(--surface-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.timer-btn-reset:hover {
  background: var(--border);
}

.timer-btn-lap {
  background: #3b82f6;
  color: white;
}

.timer-btn-lap:hover {
  background: #2563eb;
}


#timerLaps {
  max-height: 150px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 8px;
}

.timer-laps-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.timer-laps-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.timer-laps-clear {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.timer-laps-clear:hover {
  color: #ef4444;
}

.timer-lap-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 8px;
  background: var(--surface-hover);
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 0.8rem;
}

.timer-lap-info {
  display: flex;
  gap: 12px;
  align-items: center;
}

.timer-lap-number {
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 30px;
}

.timer-lap-time {
  font-weight: 600;
  color: var(--text-primary);
}

.timer-lap-elapsed {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.timer-lap-delete {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

.timer-lap-delete:hover {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}


.timer-resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 20px;
  height: 20px;
  cursor: nwse-resize;
  background: linear-gradient(135deg, transparent 50%, var(--border) 50%);
  border-radius: 0 0 16px 0;
}


.timer-panel.minimized {
  width: auto;
  min-width: 200px;
}

.timer-panel.minimized .timer-body {
  padding: 12px 16px;
}

.timer-panel.minimized .timer-presets,
.timer-panel.minimized #timerLaps,
.timer-panel.minimized .timer-progress,
.timer-panel.minimized #timerStatus {
  display: none;
}

.timer-panel.minimized #timerDisplay {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.timer-panel.minimized .timer-controls {
  gap: 4px;
}

.timer-panel.minimized .timer-btn {
  padding: 6px 10px;
  font-size: 0.8rem;
}

.timer-panel.minimized .timer-btn span {
  display: none;
}


.timer-reopen-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
  transition: all 0.2s ease;
  z-index: 998;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
}

.timer-reopen-btn i {
  display: block;
  width: auto;
  height: auto;
}

.timer-reopen-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.4);
}

.timer-reopen-btn.pulse {
  animation: reopenPulse 2s infinite;
}

@keyframes reopenPulse {
  0%, 100% { box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3); }
  50% { box-shadow: 0 4px 20px rgba(249, 115, 22, 0.6); }
}


#progressSection {
  padding: 0;
}

#progressSection .section-title {
  margin-bottom: 1.5rem;
}

.progress-overview {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  margin-bottom: 24px;
  align-items: stretch;
}

@media (max-width: 768px) {
  .progress-overview {
    grid-template-columns: 1fr;
  }
}

.progress-ring-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.progress-ring {
  position: relative;
  width: 120px;
  height: 120px;
}

.progress-ring svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.progress-ring circle {
  fill: none;
  stroke-width: 10;
}

.progress-ring .progress-ring-bg {
  stroke: var(--border);
}

.progress-ring .progress-ring-fill {
  stroke: var(--primary-color);
  stroke-linecap: round;
  stroke-dasharray: 377;
  stroke-dashoffset: 377;
  transition: stroke-dashoffset 0.5s ease;
}

.progress-ring-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.progress-ring-text .progress-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.progress-ring-text .progress-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (max-width: 600px) {
  .progress-stats {
    grid-template-columns: 1fr;
  }
}

.progress-stat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.progress-stat-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: var(--primary-light);
  color: var(--primary-color);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.progress-stat-info {
  flex: 1;
  min-width: 0;
}

.progress-stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.progress-stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.progress-filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.progress-filter {
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-primary);
}

.progress-filter:hover {
  background: var(--surface-hover);
  border-color: var(--primary-color);
}

.progress-filter.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.progress-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.progress-list .empty-state {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

.progress-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.2s ease;
}

.progress-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.progress-item-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: var(--primary-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 1rem;
}

.progress-item-info {
  flex: 1;
  min-width: 0;
}

.progress-item-title {
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.progress-item-path {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.progress-item-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 150px;
}

@media (max-width: 600px) {
  .progress-item {
    flex-wrap: wrap;
  }
  .progress-item-bar {
    width: 100%;
    min-width: 0;
  }
}

.progress-bar-container {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary-color);
  border-radius: 4px;
  transition: width 0.3s ease;
}

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

.progress-bar-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 40px;
  text-align: right;
}


#analyticsSection .analytics-grid,
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 500px) {
  #analyticsSection .analytics-grid,
  .analytics-grid {
    grid-template-columns: 1fr;
  }
}

.analytics-stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.analytics-stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.analytics-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.analytics-stat-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: var(--primary-light);
  color: var(--primary-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.analytics-stat-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.analytics-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.analytics-stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.analytics-card,
#analyticsSection .chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.analytics-card h3,
#analyticsSection h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.analytics-card h3 i,
#analyticsSection h3 i {
  color: var(--primary-color);
}

.chart-container {
  min-height: 180px;
}

#subjectChart,
#accessChart {
  background: var(--background);
  border-radius: 8px;
  padding: 1rem;
  width: 100%;
  max-width: 100%;
  min-height: 160px;
}

.recent-activity-list {
  max-height: 400px;
  overflow-y: auto;
}

.deck-card,
.note-card {
  position: relative;
}

.deck-card .btn-icon.delete,
.note-card .btn-icon.delete,
.deck-card button.btn-icon,
.note-card button.btn-icon {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--surface-hover);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  z-index: 10;
}

.deck-card .btn-icon.delete:hover,
.note-card .btn-icon.delete:hover,
.deck-card button.btn-icon:hover,
.note-card button.btn-icon:hover {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

.session-item .btn-icon,
.session-item button.btn-icon {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.session-item .btn-icon:hover,
.session-item button.btn-icon:hover {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border-color: #ef4444;
}

.confirm-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.confirm-modal {
  background: var(--surface);
  border-radius: 16px;
  padding: 24px;
  min-width: 320px;
  max-width: 400px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  animation: slideUp 0.2s ease;
}

@keyframes slideUp {
  from { 
    opacity: 0;
    transform: translateY(20px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

.confirm-modal-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 16px auto;
}

.confirm-modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  margin: 0 0 8px 0;
}

.confirm-modal-message {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 24px 0;
  line-height: 1.5;
}

.confirm-modal-actions {
  display: flex;
  gap: 12px;
}

.confirm-modal-actions .btn {
  flex: 1;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.9rem;
}

.confirm-modal-actions .btn-cancel {
  background: var(--surface-hover);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.confirm-modal-actions .btn-cancel:hover {
  background: var(--border);
}

.confirm-modal-actions .btn-danger {
  background: #ef4444;
  border: none;
  color: white;
}

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