:root {
            --primary-color: #0056b3;
            --accent-color: #ff8c00;
            --diff-added: #e6ffec;
            --diff-removed: #ffebe9;
            --text-main: #24292e;
            --text-light: #586069;
            --bg-light: #f6f8fa;
            --white: #ffffff;
            --max-width: 1300px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

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

        /* 导航栏样式 */
        .i0yps4-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .i0yps4-nav-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .i0yps4-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .i0yps4-logo img {
            height: 40px;
            width: auto;
            object-fit: contain;
        }

        .i0yps4-nav-menu {
            display: flex;
            list-style: none;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .i0yps4-nav-menu a {
            text-decoration: none;
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            padding: 8px 0;
            border-bottom: 2px solid transparent;
        }

        .i0yps4-nav-menu a:hover {
            color: var(--primary-color);
        }

        .i0yps4-nav-menu a.i0yps4-active {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }

        /* Hero 区块 - 独特非对称布局 */
        .i0yps4-hero {
            padding: 160px 32px 96px;
            background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .i0yps4-hero::before {
            content: "";
            position: absolute;
            top: -10%;
            right: -5%;
            width: 40%;
            height: 80%;
            background: radial-gradient(circle, rgba(0,86,179,0.05) 0%, transparent 70%);
            z-index: 0;
        }

        .i0yps4-hero-content {
            max-width: var(--max-width);
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .i0yps4-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            color: #1a1a1a;
            margin-bottom: 24px;
            max-width: 800px;
            word-break: break-word;
        }

        .i0yps4-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--text-light);
            max-width: 700px;
            margin-bottom: 48px;
            word-break: break-word;
        }

        /* 功能展示区 1: 文本比对 */
        .i0yps4-feature-section {
            padding: 96px 32px;
            max-width: var(--max-width);
            margin: 0 auto;
        }

        .i0yps4-grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .i0yps4-content-box {
            min-width: 0;
            word-break: break-word;
        }

        .i0yps4-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0,86,179,0.1);
            color: var(--primary-color);
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .i0yps4-section-title {
            font-size: clamp(1.8rem, 3vw, 2.4rem);
            margin-bottom: 24px;
            color: #1a1a1a;
        }

        .i0yps4-section-desc {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 32px;
        }

        .i0yps4-image-wrapper {
            position: relative;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            transition: var(--transition);
        }

        .i0yps4-image-wrapper:hover {
            transform: translateY(-8px);
        }

        .i0yps4-image-wrapper img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 功能展示区 2: 文件夹对比 (反向布局) */
        .i0yps4-bg-alt {
            background-color: var(--bg-light);
        }

        .i0yps4-reverse {
            direction: rtl;
        }
        .i0yps4-reverse > * {
            direction: ltr;
        }

        /* 功能卡片区: 三路合并 */
        .i0yps4-logic-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .i0yps4-card {
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .i0yps4-card:hover {
            box-shadow: 0 12px 24px rgba(0,0,0,0.05);
            border-color: var(--primary-color);
        }

        .i0yps4-card-icon {
            font-size: 2rem;
            margin-bottom: 24px;
        }

        .i0yps4-card-title {
            font-size: 1.4rem;
            margin-bottom: 16px;
            color: #1a1a1a;
        }

        /* 页脚设计 */
        .i0yps4-footer {
            background: #1a1a1a;
            color: #ffffff;
            padding: 80px 32px 40px;
        }

        .i0yps4-footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 48px;
        }

        .i0yps4-footer-brand h2 {
            font-size: 1.8rem;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .i0yps4-footer-brand p {
            color: #999;
            font-size: 0.9rem;
        }

        .i0yps4-footer-links h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

        .i0yps4-footer-links ul {
            list-style: none;
        }

        .i0yps4-footer-links li {
            margin-bottom: 12px;
        }

        .i0yps4-footer-links a {
            color: #999;
            text-decoration: none;
            transition: var(--transition);
        }

        .i0yps4-footer-links a:hover {
            color: var(--white);
        }

        .i0yps4-copyright {
            text-align: center;
            padding-top: 40px;
            color: #666;
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0yps4-grid-2 {
                grid-template-columns: 1fr;
            }
            .i0yps4-navbar {
                height: auto;
                padding: 16px 0;
            }
            .i0yps4-nav-container {
                flex-direction: column;
                gap: 16px;
            }
            .i0yps4-hero {
                padding-top: 140px;
            }
            .i0yps4-reverse {
                direction: ltr;
            }
        }

        /* 结构化数据辅助类 */
        .i0yps4-hidden { display: none; }