:root {
            --i0sbar-primary: #424242;
            --i0sbar-accent: #007AFF;
            --i0sbar-bg: #f8f9fa;
            --i0sbar-text: #2c3e50;
            --i0sbar-text-light: #6c757d;
            --i0sbar-white: #ffffff;
            --i0sbar-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --i0sbar-radius: 16px;
            --i0sbar-spacing: 8px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--i0sbar-bg);
            color: var(--i0sbar-text);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 流体字体 */
        h1 { font-size: clamp(2rem, 5vw + 1rem, 3.5rem); line-height: 1.2; font-weight: 800; margin-bottom: 24px; color: var(--i0sbar-primary); }
        h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.2rem); margin-bottom: 24px; font-weight: 700; }
        p { font-size: clamp(1rem, 1vw + 0.5rem, 1.125rem); margin-bottom: 16px; }

        /* 导航栏 */
        .i0sbar-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .i0sbar-nav-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .i0sbar-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .i0sbar-logo img {
            height: 32px;
            width: auto;
        }

        .i0sbar-menu {
            display: flex;
            gap: 16px;
            list-style: none;
            flex-wrap: wrap;
            min-width: 0;
        }

        .i0sbar-menu a {
            text-decoration: none;
            color: var(--i0sbar-text);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .i0sbar-menu a:hover {
            color: var(--i0sbar-accent);
            background: rgba(0, 122, 255, 0.05);
        }

        .i0sbar-menu a.i0sbar-active {
            color: var(--i0sbar-white);
            background: var(--i0sbar-accent);
        }

        /* 容器 */
        .i0sbar-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* Hero 区 - 独特卡片式悬浮布局 */
        .i0sbar-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            text-align: center;
            background: radial-gradient(circle at top right, rgba(0, 122, 255, 0.05), transparent);
        }

        .i0sbar-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .i0sbar-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(0, 122, 255, 0.1);
            color: var(--i0sbar-accent);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .i0sbar-hero-visual {
            margin-top: 64px;
            position: relative;
            background: var(--i0sbar-white);
            border-radius: 24px;
            padding: 40px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .i0sbar-upload-flow {
            display: flex;
            justify-content: space-around;
            align-items: center;
            width: 100%;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 32px;
        }

        .i0sbar-flow-step {
            flex: 1;
            min-width: 200px;
            padding: 24px;
            background: var(--i0sbar-bg);
            border-radius: 16px;
            text-align: center;
        }

        .i0sbar-flow-step span {
            display: block;
            font-size: 32px;
            margin-bottom: 12px;
        }

        /* 核心特性区块 */
        .i0sbar-section {
            padding: 96px 0;
        }

        .i0sbar-feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .i0sbar-card {
            background: var(--i0sbar-white);
            padding: 40px;
            border-radius: var(--i0sbar-radius);
            box-shadow: var(--i0sbar-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.02);
            display: flex;
            flex-direction: column;
        }

        .i0sbar-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.1);
        }

        .i0sbar-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
            color: var(--i0sbar-accent);
        }

        /* 图文混排区块 */
        .i0sbar-split {
            display: flex;
            align-items: center;
            gap: 64px;
            flex-wrap: wrap;
        }

        .i0sbar-split > * {
            flex: 1;
            min-width: 300px;
        }

        .i0sbar-image-box {
            background: #e9ecef;
            height: 400px;
            border-radius: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #adb5bd;
            position: relative;
            overflow: hidden;
            box-shadow: inset 0 0 50px rgba(0,0,0,0.05);
        }

        .i0sbar-image-box::before {
            content: "PREVIEW";
            font-size: 4rem;
            opacity: 0.1;
            letter-spacing: 10px;
        }

        /* 工作流场景 */
        .i0sbar-workflow-section {
            background: var(--i0sbar-primary);
            color: var(--i0sbar-white);
            border-radius: 40px;
            margin: 48px 24px;
            padding: 80px 48px;
        }

        .i0sbar-workflow-item {
            border-left: 4px solid var(--i0sbar-accent);
            padding-left: 24px;
            margin-bottom: 48px;
            min-width: 0;
        }

        .i0sbar-persona {
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--i0sbar-accent);
            font-weight: 700;
            margin-bottom: 8px;
        }

        /* 底部 */
        .i0sbar-footer {
            padding: 64px 0;
            border-top: 1px solid rgba(0,0,0,0.05);
            background: var(--i0sbar-white);
        }

        .i0sbar-footer-content {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            flex-wrap: wrap;
            gap: 48px;
        }

        .i0sbar-brand-text {
            font-size: 24px;
            font-weight: 800;
            color: var(--i0sbar-primary);
        }

        .i0sbar-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .i0sbar-footer-column h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .i0sbar-footer-column ul {
            list-style: none;
        }

        .i0sbar-footer-column li {
            margin-bottom: 12px;
        }

        .i0sbar-footer-column a {
            text-decoration: none;
            color: var(--i0sbar-text-light);
            font-size: 14px;
            transition: color 0.3s;
        }

        .i0sbar-footer-column a:hover {
            color: var(--i0sbar-accent);
        }

        .i0sbar-copyright {
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: var(--i0sbar-text-light);
            font-size: 13px;
            width: 100%;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0sbar-nav-container { height: auto; padding: 16px; }
            .i0sbar-menu { justify-content: center; margin-top: 16px; }
            .i0sbar-hero { padding-top: 120px; }
            .i0sbar-split { flex-direction: column; }
            .i0sbar-workflow-section { margin: 24px 12px; padding: 48px 24px; }
        }