/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90d9;
    --primary-dark: #357abd;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --light-bg: #f8f9fa;
    --dark-bg: #2c3e50;
    --sidebar-width: 250px;
    --header-height: 60px;
    --border-radius: 8px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);

    /* Light mode (default) */
    --body-bg: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --input-bg: #ffffff;
    --input-border: #ddd;
    --table-hover: #f8f9fa;
}

/* Dark mode */
[data-theme="dark"] {
    --body-bg: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #e4e4e4;
    --text-muted: #a0a0a0;
    --border-color: #2d3748;
    --input-bg: #1f2937;
    --input-border: #374151;
    --table-hover: #1f2937;
    --light-bg: #1f2937;
    --dark-bg: #0f0f1a;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--body-bg);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--dark-bg);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* User Info in Sidebar */
.user-info {
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.user-email {
    display: block;
    color: rgba(255, 255, 255, 0.9);
    word-break: break-all;
}

.user-role {
    display: inline-block;
    margin-top: 5px;
    padding: 2px 8px;
    background: var(--primary-color);
    border-radius: 10px;
    font-size: 0.75rem;
    text-transform: uppercase;
}

/* Sidebar Footer with Logout */
.sidebar-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.logout-btn {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

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

.nav-menu {
    list-style: none;
    padding: 20px 0;
}

.nav-item {
    margin: 5px 10px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.nav-item a:hover,
.nav-item.active a {
    background-color: var(--primary-color);
    color: white;
}

.nav-icon {
    margin-right: 12px;
    font-size: 1.2rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 20px 30px;
}

.content-header {
    padding: 15px 0;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
}

.content-header h2 {
    color: var(--text-color);
    font-weight: 600;
}

[data-theme="dark"] .content-header {
    border-bottom-color: var(--primary-color);
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.flash-message {
    padding: 12px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flash-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.7;
}

.flash-close:hover {
    opacity: 1;
}

/* Dashboard Styles */
.dashboard {
    max-width: 1200px;
}

.welcome-section {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.welcome-section h3 {
    color: var(--dark-bg);
    margin-bottom: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card.completed {
    border-left: 4px solid var(--success-color);
}

.stat-icon {
    font-size: 2.5rem;
    margin-right: 20px;
    color: var(--primary-color);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-bg);
}

.stat-label {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.quick-actions {
    background: white;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.quick-actions h4 {
    margin-bottom: 20px;
    color: var(--dark-bg);
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: background-color 0.3s ease;
}

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

.action-icon {
    margin-right: 10px;
    font-size: 1.2rem;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-bg);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

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

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

.btn-secondary:hover {
    background-color: #5a6268;
}

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

.btn-success:hover {
    background-color: #218838;
}

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

.btn-danger:hover {
    background-color: #c82333;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.card-title {
    font-size: 1.25rem;
    color: var(--dark-bg);
    margin: 0;
}

/* Search Results */
.search-results {
    margin-top: 20px;
}

.search-result-item {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 15px;
}

.search-result-item h4 {
    margin-bottom: 8px;
}

.search-result-item h4 a {
    color: var(--primary-color);
    text-decoration: none;
}

.search-result-item h4 a:hover {
    text-decoration: underline;
}

.search-result-item .result-url {
    color: var(--success-color);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.search-result-item .result-snippet {
    color: var(--secondary-color);
}

/* Todo List Styles */
.todo-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 16px;
    background: #eee;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    text-decoration: none;
    color: var(--dark-bg);
    transition: all 0.3s ease;
}

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

.todo-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: white;
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    box-shadow: var(--shadow);
}

.todo-item.completed {
    opacity: 0.7;
}

.todo-item.completed .todo-title {
    text-decoration: line-through;
}

.todo-checkbox {
    width: 24px;
    height: 24px;
    margin-right: 15px;
    cursor: pointer;
}

.todo-content {
    flex: 1;
}

.todo-title {
    font-weight: 500;
    color: var(--dark-bg);
}

.todo-description {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: 5px;
}

.todo-tags {
    display: flex;
    gap: 5px;
    margin-top: 8px;
}

.tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--light-bg);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--secondary-color);
}

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

.todo-actions {
    display: flex;
    gap: 10px;
}

/* YouTube Transcript Styles */
.transcript-list {
    margin-top: 20px;
}

.transcript-item {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.transcript-info h4 {
    color: var(--dark-bg);
    margin-bottom: 5px;
}

.transcript-info .video-id {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.transcript-content {
    background: var(--light-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    max-height: 500px;
    overflow-y: auto;
    white-space: pre-wrap;
    line-height: 1.8;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--secondary-color);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }

    .sidebar-header h1,
    .nav-item span:not(.nav-icon),
    .user-info,
    .logout-btn span:not(.nav-icon) {
        display: none;
    }

    .nav-item a {
        justify-content: center;
        padding: 15px;
    }

    .nav-icon {
        margin-right: 0;
        font-size: 1.5rem;
    }

    .logout-btn {
        justify-content: center;
    }

    .main-content {
        margin-left: 70px;
        padding: 15px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .action-buttons {
        flex-direction: column;
    }
}

/* Dark Mode Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    border: none;
    background: none;
    width: 100%;
    font-size: 1rem;
}

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

/* Dark Mode Overrides */
[data-theme="dark"] .card,
[data-theme="dark"] .welcome-section,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .quick-actions,
[data-theme="dark"] .search-result-item,
[data-theme="dark"] .todo-item,
[data-theme="dark"] .transcript-item,
[data-theme="dark"] .user-form-card,
[data-theme="dark"] .transcript-card {
    background: var(--card-bg);
    color: var(--text-color);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .role-select,
[data-theme="dark"] textarea {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-color);
}

[data-theme="dark"] .form-control:focus {
    border-color: var(--primary-color);
}

[data-theme="dark"] .card-title,
[data-theme="dark"] .welcome-section h3,
[data-theme="dark"] .stat-value,
[data-theme="dark"] .quick-actions h4,
[data-theme="dark"] .todo-title,
[data-theme="dark"] .transcript-info h4,
[data-theme="dark"] .form-group label {
    color: var(--text-color);
}

[data-theme="dark"] .stat-label,
[data-theme="dark"] .todo-description,
[data-theme="dark"] .transcript-info .video-id,
[data-theme="dark"] .result-snippet {
    color: var(--text-muted);
}

[data-theme="dark"] .tag {
    background: var(--input-bg);
    color: var(--text-muted);
}

[data-theme="dark"] .filter-btn {
    background: var(--input-bg);
    color: var(--text-color);
}

[data-theme="dark"] .filter-btn:hover,
[data-theme="dark"] .filter-btn.active {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .transcript-content,
[data-theme="dark"] .section-content {
    background: var(--input-bg);
}

[data-theme="dark"] .user-table {
    background: var(--card-bg);
}

[data-theme="dark"] .user-table th {
    background: var(--dark-bg);
}

[data-theme="dark"] .user-table td {
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .user-table tr:hover {
    background: var(--table-hover);
}

[data-theme="dark"] .current-user {
    background: rgba(255, 193, 7, 0.1);
}

[data-theme="dark"] .card-header {
    border-color: var(--border-color);
}

[data-theme="dark"] .empty-state {
    color: var(--text-muted);
}