:root {
            --f8a5-primary: #ff4d4f;
            --f8a5-primary-hover: #ff7875;
            --f8a5-text-main: #262626;
            --f8a5-text-sec: #595959;
            --f8a5-bg-light: #f5f5f5;
            --f8a5-white: #ffffff;
            --f8a5-container-width: 1100px;
            --f8a5-radius: 16px;
            --f8a5-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--f8a5-text-main);
            line-height: 1.7;
            background-color: #fafafa;
            word-break: keep-all;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* 导航栏 */
        .f8a5-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .f8a5-nav-container {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .f8a5-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .f8a5-logo img {
            height: 32px;
            width: auto;
        }

        .f8a5-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .f8a5-nav-item a {
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--f8a5-text-sec);
            border-radius: 8px;
        }

        .f8a5-nav-item a:hover {
            color: var(--f8a5-primary);
            background: rgba(255, 77, 79, 0.05);
        }

        .f8a5-nav-item.active a {
            color: var(--f8a5-primary);
            background: rgba(255, 77, 79, 0.1);
        }

        /* Hero 区域 */
        .f8a5-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #fff 0%, #fff0f0 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .f8a5-hero::before {
            content: "";
            position: absolute;
            top: -10%;
            right: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,77,79,0.05) 0%, transparent 70%);
            border-radius: 50%;
        }

        .f8a5-hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .f8a5-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 800;
            color: #1a1a1a;
            word-break: break-word;
        }

        .f8a5-hero-subtitle {
            font-size: clamp(1rem, 1.2vw + 0.5rem, 1.25rem);
            color: var(--f8a5-text-sec);
            margin-bottom: 48px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 核心步骤区块 */
        .f8a5-section {
            padding: 96px 24px;
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
        }

        .f8a5-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .f8a5-section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 16px;
        }

        .f8a5-section-title p {
            color: var(--f8a5-text-sec);
        }

        .f8a5-grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .f8a5-card {
            background: var(--f8a5-white);
            padding: 40px;
            border-radius: var(--f8a5-radius);
            box-shadow: var(--f8a5-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
            border: 1px solid rgba(0,0,0,0.03);
        }

        .f8a5-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }

        .f8a5-step-num {
            width: 48px;
            height: 48px;
            background: var(--f8a5-primary);
            color: white;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
            margin-bottom: 24px;
        }

        .f8a5-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .f8a5-card p {
            color: var(--f8a5-text-sec);
            font-size: 1rem;
        }

        /* 平台切换引导 */
        .f8a5-platform-box {
            background: #fff;
            border-radius: 24px;
            padding: 48px;
            margin-top: 48px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            box-shadow: var(--f8a5-shadow);
        }

        .f8a5-platform-info {
            flex: 1;
            min-width: 300px;
        }

        .f8a5-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(255, 77, 79, 0.1);
            color: var(--f8a5-primary);
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .f8a5-platform-info h3 {
            font-size: 2rem;
            margin-bottom: 20px;
        }

        .f8a5-platform-list {
            list-style: none;
        }

        .f8a5-platform-list li {
            margin-bottom: 12px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--f8a5-text-sec);
        }

        .f8a5-platform-list li::before {
            content: "✓";
            color: var(--f8a5-primary);
            font-weight: bold;
        }

        .f8a5-btn {
            display: inline-block;
            padding: 14px 32px;
            background: var(--f8a5-primary);
            color: white;
            border-radius: 30px;
            font-weight: 600;
            margin-top: 24px;
            box-shadow: 0 4px 14px rgba(255, 77, 79, 0.3);
        }

        .f8a5-btn:hover {
            background: var(--f8a5-primary-hover);
            transform: translateY(-2px);
        }

        /* 动态内容区块 */
        .f8a5-dynamic-section {
            background: #1a1a1a;
            color: #fff;
            padding: 80px 24px;
            border-radius: 32px;
            margin: 40px auto;
            max-width: var(--f8a5-container-width);
        }

        .f8a5-dynamic-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }

        .f8a5-dynamic-item {
            padding: 24px;
            border-left: 2px solid var(--f8a5-primary);
            background: rgba(255,255,255,0.05);
            transition: background 0.3s;
        }

        .f8a5-dynamic-item:hover {
            background: rgba(255,255,255,0.1);
        }

        .f8a5-dynamic-item h4 {
            margin-bottom: 8px;
            color: #efefef;
        }

        .f8a5-dynamic-item p {
            font-size: 14px;
            color: #999;
        }

        /* 页脚 */
        .f8a5-footer {
            background: #f0f2f5;
            padding: 80px 24px 40px;
            margin-top: 80px;
        }

        .f8a5-footer-content {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .f8a5-footer-brand {
            flex: 1;
            min-width: 250px;
        }

        .f8a5-footer-brand span {
            font-size: 24px;
            font-weight: 800;
            color: var(--f8a5-text-main);
            display: block;
            margin-bottom: 16px;
        }

        .f8a5-footer-brand p {
            color: var(--f8a5-text-sec);
            font-size: 14px;
        }

        .f8a5-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .f8a5-footer-col h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .f8a5-footer-col ul {
            list-style: none;
        }

        .f8a5-footer-col li {
            margin-bottom: 12px;
        }

        .f8a5-footer-col a {
            color: var(--f8a5-text-sec);
            font-size: 14px;
        }

        .f8a5-footer-col a:hover {
            color: var(--f8a5-primary);
        }

        .f8a5-copyright {
            max-width: var(--f8a5-container-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            font-size: 13px;
            color: #8c8c8c;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .f8a5-nav-container {
                height: auto;
                padding: 16px;
            }
            .f8a5-nav-menu {
                width: 100%;
                margin-top: 16px;
                justify-content: center;
            }
            .f8a5-hero {
                padding: 120px 24px 60px;
            }
            .f8a5-platform-box {
                padding: 32px;
            }
            .f8a5-footer-links {
                gap: 32px;
            }
        }