/* YouTube Video Collection System - Styles */

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

:root {
    --primary-color: #ff0000;
    --primary-dark: #cc0000;
    --secondary-color: #606060;
    --background: #f5f5f5;
    --card-background: #ffffff;
    --text-primary: #212121;
    --text-secondary: #606060;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --error-color: #f44336;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Navbar */
.navbar {
    background-color: var(--card-background);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.nav-container h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

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

.user-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.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: #505050;
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

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

/* Auth Container */
.auth-container {
    max-width: 400px;
    margin: 50px auto;
    background: var(--card-background);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.auth-container h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: var(--background);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

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

.form-container {
    display: none;
}

.form-container.active {
    display: block;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.error-message {
    color: var(--error-color);
    margin-top: 10px;
    font-size: 0.875rem;
}

.message {
    padding: 12px;
    border-radius: 4px;
    margin-top: 15px;
}

.message.success {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.message.error {
    background-color: #ffebee;
    color: var(--error-color);
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.filter-section {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-section label {
    color: var(--text-secondary);
}

.filter-section select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

/* Video Grid */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    background: var(--card-background);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.video-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.video-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    border-radius: 8px 8px 0 0;
}

.video-thumbnail.placeholder {
    background: #e0e0e0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    min-height: 180px;
    object-fit: none;
    position: relative;
}

.video-thumbnail.placeholder::before {
    content: "📷";
    font-size: 3rem;
    opacity: 0.3;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.video-info {
    padding: 15px;
}

.video-title {
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
    gap: 10px;
}

.category-badge {
    background: var(--primary-color);
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
}

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

/* Form Card */
.form-card {
    background: var(--card-background);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.info-box {
    background: var(--card-background);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-top: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.info-box h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.info-box ol {
    margin-left: 20px;
}

.info-box li {
    margin-bottom: 8px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    overflow: auto;
}

.modal-content {
    background-color: var(--card-background);
    margin: 50px auto;
    padding: 30px;
    border-radius: 8px;
    max-width: 500px;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
}

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

/* Admin Panel */
.admin-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.admin-tab-btn {
    padding: 12px 24px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}

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

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

.admin-tab-content {
    display: none;
}

.admin-tab-content.active {
    display: block;
}

.admin-table-container {
    background: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.admin-table th {
    background-color: var(--background);
    font-weight: 600;
    color: var(--text-primary);
}

.admin-table tr:hover {
    background-color: var(--background);
}

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

.admin-table a:hover {
    text-decoration: underline;
}

/* Utility Classes */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Folder Sidebar */
.folder-sidebar {
    width: 280px;
    background: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 15px;
    position: sticky;
    top: 20px;
}

.folder-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.folder-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.folder-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-item {
    background: var(--background);
    border: 1px solid var(--border-color);
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.breadcrumb-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.breadcrumb-item.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.folder-tree {
    max-height: 600px;
    overflow-y: auto;
}

.folder-item {
    padding: 8px 10px;
    margin: 2px 0;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 0.2s;
}

.folder-item:hover {
    background: var(--background);
}

.folder-item.active {
    background: var(--primary-color);
    color: white;
}

.folder-item-content {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.folder-item-actions {
    display: flex;
    gap: 5px;
    opacity: 0;
    transition: opacity 0.2s;
}

.folder-item:hover .folder-item-actions {
    opacity: 1;
}

.folder-item-actions button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 5px;
    font-size: 0.85rem;
    border-radius: 3px;
}

.folder-item-actions button:hover {
    background: rgba(255,255,255,0.2);
}

.folder-children {
    margin-left: 20px;
    border-left: 2px solid var(--border-color);
    padding-left: 10px;
}

.folder-icon {
    font-size: 1rem;
}

.main-content {
    min-width: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
        flex-direction: column !important;
    }
    
    .folder-sidebar {
        width: 100%;
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }

    .nav-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        width: 100%;
        margin-top: 10px;
    }

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

    .videos-grid {
        grid-template-columns: 1fr;
    }

    .form-card {
        padding: 20px;
    }

    .auth-container {
        margin: 20px;
        padding: 20px;
    }

    .admin-table {
        font-size: 0.875rem;
    }

    .admin-table th,
    .admin-table td {
        padding: 8px;
    }

    .modal-content {
        margin: 20px;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .video-actions {
        flex-direction: column;
    }

    .video-actions .btn {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }
}