* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --youtube-red: #FF0000;
            --youtube-dark: #0F0F0F;
            --youtube-light: #f9f9f9;
            --card-bg: #ffffff;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            --border-radius: 10px;
            --text-primary: #333333;
            --text-secondary: #666666;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: var(--text-primary);
            min-height: 100vh;
            padding: 20px;
            line-height: 1.6;
        }

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

        /* Header */
        .header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .logo-icon {
            background: var(--youtube-red);
            width: 50px;
            height: 50px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
        }

        .logo h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--youtube-red);
        }

        .tagline {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Main Content */
        .main-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
        }

        @media (min-width: 992px) {
            .main-content {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* Card */
        .card {
            background: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }

        .card-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f0f0f0;
        }

        .card-header i {
            font-size: 22px;
            margin-right: 12px;
            color: var(--youtube-red);
        }

        .card-header h2 {
            font-size: 22px;
            font-weight: 600;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

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

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

        .category-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 10px;
        }

        .category-tag {
            background: #f8f8f8;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 14px;
            cursor: pointer;
            border: 2px solid #e0e0e0;
            transition: all 0.3s;
        }

        .category-tag.active {
            background: var(--youtube-red);
            color: white;
            border-color: var(--youtube-red);
        }

        /* Buttons */
        .buttons {
            display: flex;
            gap: 15px;
            margin-top: 25px;
        }

        .btn {
            flex: 1;
            padding: 14px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

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

        .btn-primary:hover {
            background: #cc0000;
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: #f0f0f0;
            color: var(--text-primary);
        }

        .btn-secondary:hover {
            background: #e0e0e0;
        }

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

        .tags-count {
            background: var(--youtube-red);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 14px;
        }

        .tags-container {
            background: #f9f9f9;
            border-radius: 8px;
            padding: 20px;
            min-height: 200px;
            border: 2px dashed #e0e0e0;
        }

        .tags-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
        }

        .tag {
            background: #e9e9e9;
            padding: 10px 15px;
            border-radius: 20px;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .tag:hover {
            background: #ddd;
        }

        .tag-copy {
            font-size: 12px;
            opacity: 0.7;
        }

        .tag-actions {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 15px;
            border-top: 1px solid #e0e0e0;
        }

        .copy-success {
            color: #28a745;
            font-size: 14px;
            display: none;
            align-items: center;
            gap: 5px;
        }

        /* Empty State */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-secondary);
        }

        .empty-state i {
            font-size: 40px;
            margin-bottom: 15px;
            color: #ccc;
        }

        /* Loading */
        .loading {
            display: none;
            text-align: center;
            padding: 30px;
        }

        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid #f3f3f3;
            border-top: 4px solid var(--youtube-red);
            border-radius: 50%;
            margin: 0 auto 15px;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Footer */
        .footer {
            text-align: center;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #e0e0e0;
            color: var(--text-secondary);
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .buttons {
                flex-direction: column;
            }
            
            .card {
                padding: 20px;
            }
        }

        @media (max-width: 480px) {
            .logo {
                flex-direction: column;
                gap: 10px;
            }
            
            .category-tags {
                justify-content: center;
            }
        }