/* 基础样式 */
        :root {
            --primary: #4361ee;
            --primary-light: #eef2ff;
            --secondary: #7209b7;
            --success: #4cc9f0;
            --danger: #f72585;
            --warning: #f8961e;
            --light: #ffffff;
            --dark: #2d3748;
            --gray: #718096;
            --gray-light: #f7fafc;
            --border-radius: 12px;
            --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

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

        body {
            background: linear-gradient(135deg, #f0f4ff 0%, #e6f0ff 100%);
            min-height: 100vh;
            color: var(--dark);
        }

        /* 导航栏 */
        .navbar {
            background: var(--light);
            box-shadow: var(--box-shadow);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            padding: 0 5%;
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }

        .logo i {
            font-size: 2rem;
        }

        .nav-menu {
            display: flex;
            gap: 40px;
            list-style: none;
        }

        .nav-link {
            color: var(--dark);
            text-decoration: none;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }

        .nav-link:hover::after {
            width: 100%;
        }

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

        .nav-link.active::after {
            width: 100%;
        }

        /* 汉堡菜单按钮 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 5px;
        }

        .hamburger span {
            display: block;
            width: 25px;
            height: 3px;
            background: var(--dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(6px, 6px);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(6px, -6px);
        }

        /* 主内容区 */
        .main-content {
            margin-top: 100px;
            padding: 40px 5%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 英雄区域 */
        .hero-section {
            text-align: center;
            margin-bottom: 60px;
            padding: 60px 0;
        }

        .hero-title {
            font-size: 3.5rem;
            margin-bottom: 20px;
            background: linear-gradient(90deg, #4361ee, #7209b7);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto 40px;
            line-height: 1.6;
        }

        .hero-features {
            display: flex;
            justify-content: center;
            gap: 30px;
            flex-wrap: wrap;
            margin-top: 40px;
        }

        .hero-feature {
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            width: 180px;
            text-align: center;
            transition: var(--transition);
        }

        .hero-feature:hover {
            transform: translateY(-10px);
        }

        .hero-feature i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        /* 卡片布局 */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }

        .card {
            background: var(--light);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
        }

        .card-header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 20px 30px;
        }

        .card-header h2 {
            font-size: 1.5rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-body {
            padding: 30px;
        }

        /* 表单元素 */
        .form-group {
            margin-bottom: 25px;
        }

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

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
            background: var(--light);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .option-group {
            display: flex;
            gap: 15px;
            margin-bottom: 20px;
        }

        .option-card {
            flex: 1;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            padding: 15px;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }

        .option-card:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .option-card.selected {
            border-color: var(--primary);
            background: var(--primary-light);
        }

        .option-card i {
            font-size: 1.5rem;
            margin-bottom: 10px;
            color: var(--primary);
        }

        .option-card h3 {
            font-size: 1.1rem;
            margin-bottom: 5px;
        }

        .option-card p {
            font-size: 0.85rem;
            color: var(--gray);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }

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

        .btn-primary:hover {
            background: #3a56d4;
            transform: translateY(-2px);
        }

        .btn-block {
            width: 100%;
        }

        /* 统计卡片 */
        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            gap: 15px;
            margin-bottom: 25px;
        }

        .stat-card {
            background: var(--gray-light);
            border-radius: 8px;
            padding: 15px;
            text-align: center;
        }

        .stat-value {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--gray);
        }

        /* 页脚 */
        .footer {
            background: var(--dark);
            color: white;
            padding: 60px 5% 30px;
            margin-top: 80px;
        }

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

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: white;
            margin-bottom: 20px;
        }

        .footer-description {
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .footer-links h4,
        .footer-contact h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-contact p {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .copyright {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.9rem;
        }

        .social-links {
            display: flex;
            gap: 15px;
        }

        .social-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .social-links a:hover {
            color: var(--primary);
            transform: translateY(-3px);
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            .nav-menu {
                position: fixed;
                top: 70px;
                right: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background: var(--light);
                flex-direction: column;
                align-items: center;
                padding: 40px 0;
                transition: var(--transition);
                gap: 30px;
            }

            .nav-menu.active {
                right: 0;
            }

            .hero-title {
                font-size: 2.5rem;
            }

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

            .option-group {
                flex-direction: column;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* 其他组件 */
        .alert {
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: none;
        }

        .alert-success {
            background: rgba(76, 201, 240, 0.1);
            color: #0d6efd;
            border-left: 4px solid var(--success);
        }

        .alert-error {
            background: rgba(247, 37, 133, 0.1);
            color: #dc3545;
            border-left: 4px solid var(--danger);
        }

        .url-preview {
            background: var(--gray-light);
            border-radius: 8px;
            padding: 15px;
            margin-top: 15px;
            display: none;
        }

        .url-preview.active {
            display: block;
            animation: fadeIn 0.5s;
        }

        .preview-url {
            color: var(--primary);
            word-break: break-all;
        }

        .loading {
            display: none;
            text-align: center;
            padding: 20px;
        }

        .spinner {
            width: 30px;
            height: 30px;
            border: 4px solid rgba(67, 97, 238, 0.2);
            border-left: 4px solid var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }

        .tabs {
            display: flex;
            border-bottom: 1px solid #e2e8f0;
            margin-bottom: 20px;
        }

        .tab {
            padding: 10px 20px;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }

        .tab.active {
            border-bottom: 3px solid var(--primary);
            color: var(--primary);
            font-weight: 500;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s;
        }

        .history-list {
            max-height: 300px;
            overflow-y: auto;
        }

        .history-item {
            padding: 15px;
            border-bottom: 1px solid #e2e8f0;
            transition: var(--transition);
        }

        .history-item:hover {
            background: var(--gray-light);
        }

        .history-url {
            font-size: 0.85rem;
            color: var(--gray);
            word-break: break-all;
            margin: 5px 0;
        }

        .result-url {
            margin-top: 20px;
            padding: 15px;
            background: var(--gray-light);
            border-radius: 8px;
            display: none;
        }

        .result-url.active {
            display: block;
        }

        .security-badge {
            display: inline-block;
            background: rgba(76, 201, 240, 0.1);
            color: #0d6efd;
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-top: 10px;
        }

        .type-badge {
            display: inline-block;
            background: rgba(67, 97, 238, 0.1);
            color: var(--primary);
            padding: 3px 8px;
            border-radius: 12px;
            font-size: 0.7rem;
            margin-left: 10px;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

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

        /* 开屏广告样式 */
        #splash-ad-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #3a0ca3 0%, #4361ee 100%);
            color: white;
            z-index: 9999;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            transition: opacity 0.5s ease;
        }

        #splash-ad-skip-text {
            position: absolute;
            top: 20px;
            right: 20px;
            color: rgba(255,255,255,0.9);
            font-size: 14px;
            cursor: pointer;
            padding: 8px 16px;
            background: rgba(0,0,0,0.2);
            border-radius: 20px;
            user-select: none;
        }