:root {
            --bg-color: #ffffff;
            --text-color: #0f0f0f;
            --secondary-text: #606060;
            --card-bg: #ffffff;
            --border-color: #e0e0e0;
            --button-bg: #f9f9f9;
            --button-hover: #f0f0f0;
            --primary-color: #004aad;
            --primary-hover: #004aad;
            --modal-bg: #ffffff;
            --header-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }
        
        [data-theme="dark"] {
            --bg-color: #0f0f0f;
            --text-color: #f1f1f1;
            --secondary-text: #aaaaaa;
            --card-bg: #181818;
            --border-color: #303030;
            --button-bg: #232323;
            --button-hover: #383838;
            --modal-bg: #232323;
            --header-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
            --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto', Arial, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            transition: var(--transition);
            line-height: 1.6;
        }
        
        /* Header Styles */
        .header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 1.5rem;
            background-color: var(--card-bg);
            box-shadow: var(--header-shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: var(--transition);
        }
        
        .logo {
            height: 38px;
            margin-right: 1.5rem;
            cursor: pointer;
        }
        
        .search-bar {
            flex: 1;
            max-width: 640px;
            display: flex;
            margin: 0 1rem;
        }
        
        .search-input {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 1px solid var(--border-color);
            border-right: none;
            border-radius: 24px 0 0 24px;
            font-size: 15px;
            background-color: var(--card-bg);
            color: var(--text-color);
            transition: var(--transition);
            outline: none;
        }
        
        .search-input:focus {
            border-color: var(--primary-color);
        }
        
        .search-button {
            height: 40px;
            padding: 0 1.25rem;
            border: 1px solid var(--border-color);
            border-left: none;
            border-radius: 0 24px 24px 0;
            background-color: var(--button-bg);
            cursor: pointer;
            transition: var(--transition);
        }
        
        .search-button:hover {
            background-color: var(--button-hover);
        }
        
        .user-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-left: 1rem;
        }
        
        .user-actions button {
            padding: 0 1rem;
            height: 40px;
            border: 1px solid var(--border-color);
            border-radius: 24px;
            background-color: var(--button-bg);
            color: var(--text-color);
            font-size: 14px;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .user-actions button:hover {
            background-color: var(--button-hover);
        }
        .user-actions .theme-toggle {
            display: contents;
        }
        .material-symbols-outlined {
            background: var(--button-bg);
            transition: var(--transition);
            border-radius: 50%;
            height: 40px;
            width: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .user-actions button#signInButton {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .user-actions button#signInButton:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
        }
        
        .user-avatar {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            object-fit: cover;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .user-avatar:hover {
            transform: scale(1.1);
        }
        
        /* Main Content Styles */
        .video-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            padding: 1.5rem;
            max-width: 1600px;
            margin: 0 auto;
        }
        
        .video-card {
            background-color: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--card-shadow);
        }
        
        .video-card:hover {
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
        }
        
        .thumbnail-container {
            position: relative;
            width: 100%;
            padding-bottom: 56.25%; /* 16:9 aspect ratio */
            overflow: hidden;
        }
        
        .thumbnail {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .video-card:hover .thumbnail {
            transform: scale(1.03);
        }
        
        .video-details {
            padding: 1rem;
        }
        
        .video-title {
            font-size: 15px;
            font-weight: 500;
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.4;
        }
        
        .video-uploader-name {
            font-size: 13px;
            color: var(--secondary-text);
            margin-bottom: 0.25rem;
        }
        
        .video-upload-date {
            font-size: 13px;
            color: var(--secondary-text);
        }
        
        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 2000;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .modal.show {
            opacity: 1;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .modal-content {
            background-color: var(--modal-bg);
            padding: 2rem;
            width: 90%;
            max-width: 440px;
            border-radius: 12px;
            color: var(--text-color);
            transform: translateY(20px);
            transition: transform 0.3s ease, opacity 0.3s ease;
            opacity: 0;
            position: relative;
        }
        
        .modal.show .modal-content {
            transform: translateY(0);
            opacity: 1;
        }
        
        .close-btn {
            position: absolute;
            right: 1.5rem;
            top: 1.5rem;
            cursor: pointer;
            font-size: 20px;
            color: var(--secondary-text);
            transition: var(--transition);
        }
        
        .close-btn:hover {
            color: var(--text-color);
            transform: rotate(90deg);
        }
        
        .form-group {
            margin-bottom: 1.25rem;
        }
        
        .form-group label {
            display: block;
            font-size: 14px;
            margin-bottom: 0.5rem;
            color: var(--secondary-text);
        }
        
        input, textarea {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 15px;
            background-color: var(--card-bg);
            color: var(--text-color);
            transition: var(--transition);
        }
        
        input:focus, textarea:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 2px #004aad1a;
        }
        
        textarea {
            resize: vertical;
            min-height: 100px;
        }
        
        button[type="submit"], .cloudinary-button {
            background-color: var(--primary-color);
            color: #fff;
            padding: 0.75rem;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            width: 100%;
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }
        
        button[type="submit"]:hover, .cloudinary-button:hover {
            background-color: var(--primary-hover);
        }
        
        .auth-toggle {
            text-align: center;
            margin-top: 1rem;
            font-size: 14px;
            color: var(--secondary-text);
        }
        
        .auth-toggle a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
        }
        
        .auth-toggle a:hover {
            text-decoration: underline;
        }
        
        /* Loading State */
        .loading {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem;
        }
        
        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid #004aad1a;
            border-radius: 50%;
            border-top-color: var(--primary-color);
            animation: spin 1s ease-in-out infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .header {
                flex-wrap: wrap;
                gap: 0.75rem;
                padding: 0.75rem;
            }
            
            .logo {
                margin-right: 0;
            }
            
            .search-bar {
                order: 3;
                width: 100%;
                margin: 0.5rem 0;
            }
            
            .user-actions {
                margin-left: auto;
            }
            
            .video-container {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
                padding: 1rem;
                gap: 1rem;
            }
        }
        
        @media (max-width: 480px) {
            .video-container {
                grid-template-columns: 1fr;
            }
            
            .modal-content {
                padding: 1.5rem;
            }
        }