:root {
            --i0yps4-primary: #0066cc;
            --i0yps4-secondary: #ff9900;
            --i0yps4-bg: #f8fafc;
            --i0yps4-text: #1e293b;
            --i0yps4-text-light: #64748b;
            --i0yps4-white: #ffffff;
            --i0yps4-accent: #e2e8f0;
            --i0yps4-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --i0yps4-radius: 16px;
            --i0yps4-max-width: 1100px;
        }

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

        body {
            font-family: "Inter", "Microsoft YaHei", -apple-system, sans-serif;
            background-color: var(--i0yps4-bg);
            color: var(--i0yps4-text);
            line-height: 1.8;
            overflow-x: hidden;
        }

        /* 导航栏设计 */
        .i0yps4-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            z-index: 1000;
            border-bottom: 1px solid var(--i0yps4-accent);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .i0yps4-nav-container {
            width: var(--i0yps4-max-width);
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

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

        .i0yps4-nav-links {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            list-style: none;
            min-width: 0;
        }

        .i0yps4-nav-links li {
            min-width: 0;
        }

        .i0yps4-nav-links a {
            text-decoration: none;
            color: var(--i0yps4-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .i0yps4-nav-links a:hover, .i0yps4-nav-links a.active {
            color: var(--i0yps4-primary);
            background: rgba(0, 102, 204, 0.05);
        }

        /* Hero 独特布局：非对称结构 */
        .i0yps4-hero {
            padding-top: 160px;
            padding-bottom: 80px;
            background: radial-gradient(circle at top right, #e0f2fe 0%, transparent 40%),
                        radial-gradient(circle at bottom left, #fff7ed 0%, transparent 40%);
            display: flex;
            justify-content: center;
        }

        .i0yps4-hero-content {
            width: var(--i0yps4-max-width);
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            min-width: 0;
        }

        .i0yps4-hero-text {
            flex: 1;
            min-width: 300px;
            padding-right: 48px;
            word-break: break-word;
        }

        .i0yps4-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            margin-bottom: 24px;
            color: #0f172a;
        }

        .i0yps4-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--i0yps4-text-light);
            max-width: 600px;
            margin-bottom: 32px;
        }

        /* 协议内容区 */
        .i0yps4-license-section {
            padding: 80px 0;
            display: flex;
            justify-content: center;
        }

        .i0yps4-container {
            width: var(--i0yps4-max-width);
            padding: 0 24px;
            min-width: 0;
        }

        .i0yps4-license-layout {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .i0yps4-license-main {
            flex: 2;
            min-width: 300px;
            background: var(--i0yps4-white);
            padding: 48px;
            border-radius: var(--i0yps4-radius);
            box-shadow: var(--i0yps4-shadow);
            border: 1px solid var(--i0yps4-accent);
            word-break: break-word;
        }

        .i0yps4-license-sidebar {
            flex: 1;
            min-width: 280px;
        }

        .i0yps4-sticky-card {
            position: sticky;
            top: 110px;
            background: linear-gradient(135deg, var(--i0yps4-primary), #004d99);
            color: white;
            padding: 32px;
            border-radius: var(--i0yps4-radius);
            box-shadow: 0 20px 40px rgba(0, 102, 204, 0.2);
        }

        .i0yps4-sticky-card h3 {
            margin-bottom: 16px;
            font-size: 1.5rem;
        }

        .i0yps4-sticky-card p {
            font-size: 0.95rem;
            opacity: 0.9;
            margin-bottom: 24px;
        }

        .i0yps4-btn-white {
            display: inline-block;
            background: white;
            color: var(--i0yps4-primary);
            padding: 12px 24px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: transform 0.3s ease;
        }

        .i0yps4-btn-white:hover {
            transform: translateY(-3px);
        }

        /* 章节样式 */
        .i0yps4-license-text h2 {
            font-size: 1.75rem;
            margin-bottom: 24px;
            border-left: 6px solid var(--i0yps4-secondary);
            padding-left: 16px;
        }

        .i0yps4-license-text p {
            margin-bottom: 24px;
            font-size: 1.1rem;
            color: #334155;
        }

        .i0yps4-highlight-box {
            background: #f1f5f9;
            border-radius: 12px;
            padding: 24px;
            margin: 32px 0;
            border: 1px dashed var(--i0yps4-text-light);
        }

        /* 页脚 */
        .i0yps4-footer {
            background: #0f172a;
            color: white;
            padding: 64px 0 32px;
            display: flex;
            justify-content: center;
        }

        .i0yps4-footer-content {
            width: var(--i0yps4-max-width);
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            min-width: 0;
        }

        .i0yps4-footer-brand {
            flex: 1;
            min-width: 200px;
            margin-bottom: 32px;
        }

        .i0yps4-footer-brand h2 {
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .i0yps4-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2;
            min-width: 300px;
        }

        .i0yps4-footer-col {
            min-width: 140px;
        }

        .i0yps4-footer-col h4 {
            margin-bottom: 24px;
            color: var(--i0yps4-secondary);
        }

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

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

        .i0yps4-footer-col a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .i0yps4-footer-col a:hover {
            color: white;
        }

        .i0yps4-copyright {
            width: 100%;
            text-align: center;
            padding-top: 48px;
            border-top: 1px solid #1e293b;
            margin-top: 48px;
            font-size: 0.85rem;
            color: #64748b;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0yps4-navbar {
                height: auto;
                padding: 16px 0;
            }
            .i0yps4-nav-container {
                flex-direction: column;
                gap: 16px;
            }
            .i0yps4-nav-links {
                justify-content: center;
            }
            .i0yps4-hero-text {
                padding-right: 0;
                text-align: center;
            }
            .i0yps4-license-main {
                padding: 24px;
            }
            .i0yps4-footer-content {
                flex-direction: column;
            }
        }