:root {
            --kmnh1y-primary: #FF4D11;
            --kmnh1y-primary-hover: #E6450F;
            --kmnh1y-dark: #1D1D1F;
            --kmnh1y-gray-bg: #F5F5F7;
            --kmnh1y-text-main: #333333;
            --kmnh1y-text-muted: #666666;
            --kmnh1y-white: #FFFFFF;
            --kmnh1y-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --kmnh1y-container-width: 1400px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--kmnh1y-text-main);
            background-color: var(--kmnh1y-white);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .kmnh1y-navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .kmnh1y-nav-container {
            width: var(--kmnh1y-container-width);
            max-width: 95vw;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            min-width: 0;
        }

        .kmnh1y-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .kmnh1y-logo img {
            height: 32px;
            display: block;
        }

        .kmnh1y-nav-links {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .kmnh1y-nav-links a {
            text-decoration: none;
            color: var(--kmnh1y-text-main);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .kmnh1y-nav-links a:hover {
            color: var(--kmnh1y-primary);
        }

        /* Hero 区 - 独特对角线视觉 */
        .kmnh1y-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            background: linear-gradient(135deg, #FFF5F2 0%, #FFFFFF 100%);
            display: flex;
            justify-content: center;
            overflow: hidden;
        }

        .kmnh1y-hero-content {
            width: var(--kmnh1y-container-width);
            max-width: 95vw;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            min-width: 0;
            gap: 48px;
        }

        .kmnh1y-hero-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .kmnh1y-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 700;
            color: var(--kmnh1y-dark);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .kmnh1y-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--kmnh1y-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.8;
        }

        .kmnh1y-hero-image {
            flex: 1;
            min-width: 320px;
            position: relative;
        }

        .kmnh1y-hero-image img {
            width: 100%;
            height: auto;
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.15);
        }

        /* 下载版本矩阵 */
        .kmnh1y-download-section {
            padding: 96px 20px;
            display: flex;
            justify-content: center;
            background-color: var(--kmnh1y-white);
        }

        .kmnh1y-grid-container {
            width: var(--kmnh1y-container-width);
            max-width: 100%;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .kmnh1y-card {
            background: var(--kmnh1y-gray-bg);
            border-radius: 24px;
            padding: 48px;
            transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
            word-break: break-word;
        }

        .kmnh1y-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--kmnh1y-shadow);
            background: #FFFBF9;
            border: 1px solid rgba(255, 77, 17, 0.1);
        }

        .kmnh1y-platform-tag {
            font-size: 14px;
            font-weight: 700;
            color: var(--kmnh1y-primary);
            text-transform: uppercase;
            margin-bottom: 16px;
            letter-spacing: 1px;
        }

        .kmnh1y-version-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .kmnh1y-target-user {
            font-size: 14px;
            color: var(--kmnh1y-text-muted);
            margin-bottom: 24px;
            padding-bottom: 24px;
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .kmnh1y-highlight-list {
            list-style: none;
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .kmnh1y-highlight-item {
            position: relative;
            padding-left: 24px;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--kmnh1y-text-main);
        }

        .kmnh1y-highlight-item::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--kmnh1y-primary);
            font-weight: bold;
        }

        .kmnh1y-metrics {
            margin-bottom: 32px;
            font-size: 13px;
            color: var(--kmnh1y-text-muted);
            background: rgba(0,0,0,0.03);
            padding: 16px;
            border-radius: 12px;
        }

        .kmnh1y-btn-download {
            display: inline-block;
            background: var(--kmnh1y-primary);
            color: white;
            text-align: center;
            padding: 16px 32px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 600;
            transition: background 0.3s ease;
        }

        .kmnh1y-btn-download:hover {
            background: var(--kmnh1y-primary-hover);
        }

        /* 安全背书区 */
        .kmnh1y-safety-banner {
            background-color: var(--kmnh1y-dark);
            padding: 64px 20px;
            color: white;
            display: flex;
            justify-content: center;
        }

        .kmnh1y-safety-content {
            width: var(--kmnh1y-container-width);
            max-width: 95vw;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 0;
        }

        .kmnh1y-safety-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .kmnh1y-safety-title {
            font-size: 32px;
            margin-bottom: 16px;
        }

        .kmnh1y-safety-badge {
            flex: 0 0 auto;
        }

        .kmnh1y-safety-badge img {
            max-width: 240px;
            height: auto;
            filter: brightness(1.1);
        }

        /* FAQ 区 */
        .kmnh1y-faq-section {
            padding: 96px 20px;
            display: flex;
            justify-content: center;
        }

        .kmnh1y-faq-wrapper {
            width: 900px;
            max-width: 100%;
            min-width: 0;
        }

        .kmnh1y-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .kmnh1y-section-header h2 {
            font-size: 36px;
            margin-bottom: 16px;
        }

        .kmnh1y-faq-item {
            margin-bottom: 24px;
            border-bottom: 1px solid #EEEEEE;
            padding-bottom: 24px;
        }

        .kmnh1y-faq-q {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--kmnh1y-dark);
            display: flex;
            align-items: flex-start;
        }

        .kmnh1y-faq-q::before {
            content: "Q";
            color: var(--kmnh1y-primary);
            margin-right: 12px;
            font-style: italic;
        }

        .kmnh1y-faq-a {
            font-size: 16px;
            color: var(--kmnh1y-text-muted);
            padding-left: 30px;
            line-height: 1.8;
        }

        /* 页脚 */
        .kmnh1y-footer {
            background: #F9F9F9;
            padding: 80px 20px 40px;
            display: flex;
            justify-content: center;
            border-top: 1px solid #ECECEC;
        }

        .kmnh1y-footer-container {
            width: var(--kmnh1y-container-width);
            max-width: 95vw;
            display: flex;
            flex-direction: column;
            gap: 48px;
            min-width: 0;
        }

        .kmnh1y-footer-top {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
        }

        .kmnh1y-footer-brand {
            flex: 1;
            min-width: 200px;
        }

        .kmnh1y-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            color: var(--kmnh1y-primary);
            margin-bottom: 16px;
        }

        .kmnh1y-footer-links-group {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .kmnh1y-footer-col h4 {
            font-size: 16px;
            margin-bottom: 20px;
            color: var(--kmnh1y-dark);
        }

        .kmnh1y-footer-col ul {
            list-style: none;
        }

        .kmnh1y-footer-col ul li {
            margin-bottom: 10px;
        }

        .kmnh1y-footer-col ul li a {
            text-decoration: none;
            color: var(--kmnh1y-text-muted);
            font-size: 14px;
            transition: color 0.3s;
        }

        .kmnh1y-footer-col ul li a:hover {
            color: var(--kmnh1y-primary);
        }

        .kmnh1y-copyright {
            text-align: center;
            font-size: 13px;
            color: #999;
            padding-top: 40px;
            border-top: 1px solid #EEEEEE;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .kmnh1y-nav-links {
                display: none; /* 简化移动端，实际开发中应使用汉堡菜单 */
            }
            .kmnh1y-hero-content {
                flex-direction: column;
                text-align: center;
            }
            .kmnh1y-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .kmnh1y-safety-content {
                flex-direction: column;
                text-align: center;
            }
            .kmnh1y-footer-top {
                flex-direction: column;
            }
        }