/* 基础变量与重置 */
        :root {
            --wba18-primary: #3d7eff;
            --wba18-secondary: #a855f7;
            --wba18-bg-dark: #050505;
            --wba18-bg-card: #111111;
            --wba18-text-main: #ffffff;
            --wba18-text-dim: #a1a1aa;
            --wba18-accent: #00f2ff;
            --wba18-border: rgba(255, 255, 255, 0.1);
            --wba18-container: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--wba18-bg-dark);
            color: var(--wba18-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 布局通用类 */
        .wba18-container {
            max-width: var(--wba18-container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航栏设计 */
        .wba18-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(5, 5, 5, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--wba18-border);
        }

        .wba18-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .wba18-logo {
            min-width: 0;
            flex-shrink: 0;
        }

        .wba18-logo img {
            height: 32px;
            width: auto;
            display: block;
        }

        .wba18-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .wba18-nav-menu li {
            min-width: 0;
        }

        .wba18-nav-link {
            text-decoration: none;
            color: var(--wba18-text-dim);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .wba18-nav-link:hover, .wba18-nav-link.active {
            color: var(--wba18-primary);
        }

        /* Hero 区：动态流体背景 */
        .wba18-hero {
            padding: 160px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .wba18-hero::before {
            content: '';
            position: absolute;
            top: -20%;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 600px;
            background: radial-gradient(circle, rgba(61, 126, 255, 0.15) 0%, rgba(168, 85, 247, 0.1) 50%, transparent 70%);
            z-index: -1;
        }

        .wba18-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(to bottom right, #fff 30%, #a1a1aa 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .wba18-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--wba18-text-dim);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        /* 价格卡片布局 - Grid */
        .wba18-pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .wba18-price-card {
            background: var(--wba18-bg-card);
            border: 1px solid var(--wba18-border);
            border-radius: 24px;
            padding: 48px 32px;
            display: flex;
            flex-direction: column;
            transition: transform 0.3s ease, border-color 0.3s ease;
            position: relative;
            min-width: 0;
        }

        .wba18-price-card:hover {
            transform: translateY(-8px);
            border-color: var(--wba18-primary);
        }

        .wba18-price-card.featured {
            border: 2px solid var(--wba18-primary);
            background: linear-gradient(180deg, rgba(61, 126, 255, 0.05) 0%, var(--wba18-bg-card) 100%);
        }

        .wba18-badge {
            position: absolute;
            top: 24px;
            right: 24px;
            background: var(--wba18-primary);
            color: white;
            font-size: 12px;
            font-weight: bold;
            padding: 4px 12px;
            border-radius: 20px;
        }

        .wba18-plan-name {
            font-size: 18px;
            font-weight: 600;
            color: var(--wba18-text-dim);
            margin-bottom: 16px;
        }

        .wba18-plan-price {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: 8px;
        }

        .wba18-plan-price span {
            font-size: 16px;
            color: var(--wba18-text-dim);
            font-weight: 400;
        }

        .wba18-plan-desc {
            font-size: 14px;
            color: var(--wba18-text-dim);
            margin-bottom: 32px;
            min-height: 40px;
        }

        .wba18-feature-list {
            list-style: none;
            margin-bottom: 40px;
            flex-grow: 1;
        }

        .wba18-feature-item {
            font-size: 15px;
            margin-bottom: 16px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--wba18-text-main);
        }

        .wba18-feature-item::before {
            content: "✓";
            color: var(--wba18-primary);
            font-weight: bold;
        }

        .wba18-btn {
            display: inline-block;
            text-align: center;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .wba18-btn-primary {
            background: var(--wba18-primary);
            color: white;
        }

        .wba18-btn-outline {
            background: rgba(255, 255, 255, 0.05);
            color: white;
            border: 1px solid var(--wba18-border);
        }

        .wba18-btn:hover {
            opacity: 0.9;
            transform: scale(1.02);
        }

        /* 详细对比表格区 */
        .wba18-comparison-section {
            padding: 96px 0;
            background: rgba(255, 255, 255, 0.02);
        }

        .wba18-section-title {
            text-align: center;
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 64px;
        }

        .wba18-table-wrapper {
            overflow-x: auto;
            border: 1px solid var(--wba18-border);
            border-radius: 16px;
            background: var(--wba18-bg-card);
        }

        .wba18-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        .wba18-table th, .wba18-table td {
            padding: 24px;
            text-align: left;
            border-bottom: 1px solid var(--wba18-border);
        }

        .wba18-table th {
            color: var(--wba18-text-dim);
            font-weight: 500;
            font-size: 14px;
        }

        .wba18-table-category {
            background: rgba(255, 255, 255, 0.03);
            font-weight: bold;
            color: var(--wba18-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            font-size: 12px;
        }

        /* 问答区块 */
        .wba18-faq-section {
            padding: 96px 0;
        }

        .wba18-faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 48px;
        }

        .wba18-faq-item {
            min-width: 0;
        }

        .wba18-faq-question {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--wba18-primary);
        }

        .wba18-faq-answer {
            color: var(--wba18-text-dim);
            font-size: 15px;
        }

        /* 页脚 */
        .wba18-footer {
            padding: 80px 0 40px;
            border-top: 1px solid var(--wba18-border);
            margin-top: 80px;
        }

        .wba18-footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .wba18-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .wba18-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .wba18-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .wba18-link-group h4 {
            margin-bottom: 20px;
            font-size: 14px;
            color: var(--wba18-text-dim);
            text-transform: uppercase;
        }

        .wba18-link-group ul {
            list-style: none;
        }

        .wba18-link-group li {
            margin-bottom: 12px;
        }

        .wba18-link-group a {
            text-decoration: none;
            color: var(--wba18-text-dim);
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .wba18-link-group a:hover {
            color: white;
        }

        .wba18-copyright {
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid var(--wba18-border);
            text-align: center;
            color: var(--wba18-text-dim);
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .wba18-nav-menu {
                display: none; /* 简化演示：移动端可使用汉堡菜单 */
            }
            .wba18-nav-wrapper {
                justify-content: center;
            }
            .wba18-pricing-grid {
                grid-template-columns: 1fr;
            }
            .wba18-faq-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .wba18-footer-content {
                flex-direction: column;
            }
        }