:root {
            --sjb5-primary: #ff6600;
            --sjb5-primary-hover: #e65c00;
            --sjb5-text-main: #1d1d1f;
            --sjb5-text-sub: #86868b;
            --sjb5-bg-light: #f5f5f7;
            --sjb5-white: #ffffff;
            --sjb5-glass: rgba(255, 255, 255, 0.8);
            --sjb5-max-width: 1400px;
            --sjb5-transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
            color: var(--sjb5-text-main);
            line-height: 1.6;
            background-color: var(--sjb5-white);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        /* 文本换行规范 */
        .sjb5-text-container {
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        p {
            line-height: 1.8;
            word-break: break-word;
        }

        /* 导航栏 */
        .sjb5-nav-wrapper {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: var(--sjb5-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .sjb5-nav-container {
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 64px;
        }

        .sjb5-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .sjb5-logo img {
            height: 32px;
            width: auto;
        }

        .sjb5-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .sjb5-menu a {
            text-decoration: none;
            color: var(--sjb5-text-main);
            font-size: 14px;
            font-weight: 500;
            transition: var(--sjb5-transition);
        }

        .sjb5-menu a:hover {
            color: var(--sjb5-primary);
        }

        /* Hero 区 - 独特卡片式布局 */
        .sjb5-hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 96px 24px 64px;
            background: url('images/hero_bg.jpg') no-repeat center center;
            background-size: cover;
            overflow: hidden;
        }

        .sjb5-hero-card {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(30px);
            padding: 64px;
            border-radius: 32px;
            max-width: 800px;
            text-align: center;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
            animation: sjb5-fade-up 1s ease-out;
        }

        @keyframes sjb5-fade-up {
            from { transform: translateY(30px); opacity: 0.8; }
            to { transform: translateY(0); opacity: 1; }
        }

        .sjb5-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 700;
            background: linear-gradient(135deg, #1d1d1f 0%, #ff6600 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .sjb5-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.5rem);
            color: var(--sjb5-text-sub);
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .sjb5-btn-primary {
            display: inline-block;
            background: var(--sjb5-primary);
            color: white;
            padding: 16px 48px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 18px;
            transition: var(--sjb5-transition);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
        }

        .sjb5-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.4);
            background: var(--sjb5-primary-hover);
        }

        /* 核心功能区 - 网格布局 */
        .sjb5-section {
            padding: 96px 24px;
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
        }

        .sjb5-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .sjb5-section-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
            margin-bottom: 16px;
        }

        .sjb5-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 48px;
            align-items: stretch;
        }

        .sjb5-feature-card {
            background: var(--sjb5-bg-light);
            border-radius: 24px;
            padding: 40px;
            transition: var(--sjb5-transition);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-width: 0;
        }

        .sjb5-feature-card:hover {
            transform: scale(1.02);
            background: var(--sjb5-white);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .sjb5-feature-img {
            width: 100%;
            height: auto;
            border-radius: 16px;
            margin-bottom: 32px;
            object-fit: cover;
        }

        /* AI 灵感中心 - 侧向混排 */
        .sjb5-split-layout {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

        .sjb5-split-content {
            flex: 1;
            min-width: 320px;
        }

        .sjb5-split-image {
            flex: 1.2;
            min-width: 320px;
        }

        .sjb5-split-image img {
            width: 100%;
            border-radius: 32px;
            box-shadow: 20px 20px 60px rgba(0,0,0,0.1);
        }

        .sjb5-tag {
            display: inline-block;
            background: rgba(255, 102, 0, 0.1);
            color: var(--sjb5-primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .sjb5-tool-list {
            margin-top: 32px;
            list-style: none;
        }

        .sjb5-tool-item {
            display: flex;
            gap: 16px;
            margin-bottom: 24px;
            align-items: flex-start;
        }

        .sjb5-tool-icon {
            width: 48px;
            height: 48px;
            background: var(--sjb5-white);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            flex-shrink: 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }

        /* 视觉语义层 */
        .sjb5-visual-gallery {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 48px;
        }

        .sjb5-skin-tag {
            background: var(--sjb5-bg-light);
            padding: 12px 24px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 500;
            transition: var(--sjb5-transition);
        }

        .sjb5-skin-tag:hover {
            background: var(--sjb5-primary);
            color: white;
        }

        /* 多端同步 */
        .sjb5-cross-section {
            background: var(--sjb5-text-main);
            color: var(--sjb5-white);
            border-radius: 48px;
            padding: 80px 48px;
            text-align: center;
            margin: 64px 24px;
        }

        .sjb5-cross-image {
            max-width: 1000px;
            margin: 48px auto 0;
            width: 100%;
            border-radius: 24px;
        }

        /* 页脚 */
        .sjb5-footer {
            background: var(--sjb5-bg-light);
            padding: 80px 24px 40px;
            margin-top: 96px;
        }

        .sjb5-footer-container {
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid rgba(0,0,0,0.1);
            padding-bottom: 48px;
        }

        .sjb5-footer-brand {
            font-size: 24px;
            font-weight: 700;
            color: var(--sjb5-text-main);
            margin-bottom: 16px;
        }

        .sjb5-footer-column h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .sjb5-footer-column ul {
            list-style: none;
        }

        .sjb5-footer-column ul li {
            margin-bottom: 12px;
        }

        .sjb5-footer-column a {
            text-decoration: none;
            color: var(--sjb5-text-sub);
            font-size: 14px;
            transition: var(--sjb5-transition);
        }

        .sjb5-footer-column a:hover {
            color: var(--sjb5-primary);
        }

        .sjb5-copyright {
            text-align: center;
            padding-top: 40px;
            color: var(--sjb5-text-sub);
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .sjb5-nav-container {
                height: auto;
                padding: 16px;
            }
            .sjb5-menu {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
                gap: 12px;
            }
            .sjb5-hero-card {
                padding: 32px 16px;
                border-radius: 24px;
            }
            .sjb5-split-layout {
                flex-direction: column;
            }
            .sjb5-section {
                padding: 64px 20px;
            }
        }