* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            padding: 20px;
            color: #333;
        }
        
        .container {
            max-width: 1000px;
            margin: 0 auto;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        
        header {
            background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
            color: white;
            padding: 25px 30px;
            text-align: center;
        }
        
        h1 {
            font-size: 2.2rem;
            margin-bottom: 10px;
        }
        
        .subtitle {
            font-size: 1rem;
            opacity: 0.8;
        }
        
        .main-content {
            padding: 30px;
        }
        
        .input-section {
            margin-bottom: 30px;
        }
        
        .input-group {
            display: flex;
            margin-bottom: 15px;
        }
        
        input, textarea {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 16px;
            transition: all 0.3s;
        }
        
        input:focus, textarea:focus {
            outline: none;
            border-color: #4b6cb7;
            box-shadow: 0 0 0 2px rgba(75, 108, 183, 0.2);
        }
        
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        
        button {
            background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        
        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        button:active {
            transform: translateY(0);
        }
        
        button:disabled {
            background: #cccccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .button-group {
            display: flex;
            gap: 10px;
        }
        
        .results-section {
            margin-top: 30px;
        }
        
        .result-item {
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            transition: all 0.3s;
            border-left: 5px solid #ddd;
        }
        
        .result-item.success {
            background-color: #f0f9ff;
            border-left-color: #10b981;
        }
        
        .result-item.error {
            background-color: #fef2f2;
            border-left-color: #ef4444;
        }
        
        .result-item.checking {
            background-color: #fffbeb;
            border-left-color: #f59e0b;
        }
        
        .status-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            font-weight: bold;
            color: white;
        }
        
        .success .status-icon {
            background-color: #10b981;
        }
        
        .error .status-icon {
            background-color: #ef4444;
        }
        
        .checking .status-icon {
            background-color: #f59e0b;
            animation: pulse 1.5s infinite;
        }
        
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.5; }
            100% { opacity: 1; }
        }
        
        .link-info {
            flex: 1;
        }
        
        .link-url {
            font-weight: 600;
            margin-bottom: 5px;
            word-break: break-all;
        }
        
        .link-status {
            font-size: 14px;
            color: #666;
        }
        
        .stats {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #eee;
            font-size: 14px;
            color: #666;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 20px;
        }
        
        .spinner {
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-left-color: #4b6cb7;
            border-radius: 50%;
            width: 30px;
            height: 30px;
            animation: spin 1s linear infinite;
            margin: 0 auto 15px;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .instructions {
            background-color: #f8fafc;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-size: 14px;
            line-height: 1.6;
        }
        
        .instructions h3 {
            margin-bottom: 10px;
            color: #4b6cb7;
        }
        
        .instructions ul {
            padding-left: 20px;
        }
        
        .instructions li {
            margin-bottom: 5px;
        }
        
        @media (max-width: 768px) {
            .container {
                border-radius: 0;
            }
            
            .main-content {
                padding: 20px;
            }
            
            .input-group {
                flex-direction: column;
            }
            
            input, textarea {
                margin-bottom: 10px;
            }
            
            .button-group {
                flex-direction: column;
            }
        }