:root {
            --ysa473-primary: #FF7139;
            --ysa473-secondary: #0060DF;
            --ysa473-dark: #20123A;
            --ysa473-light: #F9F9FB;
            --ysa473-text: #15141A;
            --ysa473-gray: #5B5B66;
            --ysa473-border: rgba(0,0,0,0.08);
            --ysa473-radius: 16px;
            --ysa473-gap: 8px;
            --ysa473-container-width: 1300px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--ysa473-text);
            background-color: var(--ysa473-light);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏设计 */
        .ysa473-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--ysa473-border);
        }

        .ysa473-nav-container {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            flex-wrap: wrap;
        }

        .ysa473-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .ysa473-logo img {
            height: 40px;
            width: auto;
        }

        .ysa473-menu {
            display: flex;
            list-style: none;
            gap: 16px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .ysa473-menu-item a {
            text-decoration: none;
            color: var(--ysa473-gray);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .ysa473-menu-item a:hover {
            color: var(--ysa473-primary);
            background: rgba(255, 113, 57, 0.05);
        }

        .ysa473-menu-item.ysa473-active a {
            color: var(--ysa473-primary);
            background: rgba(255, 113, 57, 0.1);
        }

        /* Hero 区块 - 独特非对称布局 */
        .ysa473-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at 90% 10%, rgba(255, 113, 57, 0.08) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(0, 96, 223, 0.05) 0%, transparent 40%);
        }

        .ysa473-hero-inner {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .ysa473-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .ysa473-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 800;
            color: var(--ysa473-dark);
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .ysa473-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.4rem);
            color: var(--ysa473-gray);
            max-width: 600px;
            margin-bottom: 32px;
            line-height: 1.6;
        }

        /* 快捷键搜索框 */
        .ysa473-search-wrapper {
            position: relative;
            max-width: 500px;
            margin-top: 40px;
        }

        .ysa473-search-input {
            width: 100%;
            padding: 18px 24px;
            border-radius: 50px;
            border: 2px solid var(--ysa473-border);
            font-size: 1.1rem;
            outline: none;
            transition: border-color 0.3s;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .ysa473-search-input:focus {
            border-color: var(--ysa473-primary);
        }

        /* 核心内容区 */
        .ysa473-main {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            padding: 40px 24px 100px;
        }

        .ysa473-section-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .ysa473-category-card {
            background: white;
            border-radius: var(--ysa473-radius);
            padding: 32px;
            border: 1px solid var(--ysa473-border);
            transition: transform 0.3s ease, shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .ysa473-category-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.06);
        }

        .ysa473-category-header {
            display: flex;
            align-items: center;
            margin-bottom: 24px;
            gap: 12px;
        }

        .ysa473-category-icon {
            width: 40px;
            height: 40px;
            background: rgba(255, 113, 57, 0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--ysa473-primary);
            font-size: 1.2rem;
        }

        .ysa473-category-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ysa473-dark);
        }

        .ysa473-shortcut-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .ysa473-shortcut-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--ysa473-border);
        }

        .ysa473-shortcut-item:last-child {
            border-bottom: none;
        }

        .ysa473-shortcut-desc {
            color: var(--ysa473-gray);
            font-size: 0.95rem;
        }

        .ysa473-keys {
            display: flex;
            gap: 4px;
            align-items: center;
        }

        .ysa473-key {
            background: #fff;
            border: 1px solid #d1d5db;
            border-bottom: 3px solid #9ca3af;
            border-radius: 6px;
            padding: 4px 8px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--ysa473-dark);
            min-width: 32px;
            text-align: center;
            font-family: monospace;
        }

        /* 侧边信息条 */
        .ysa473-info-bar {
            background: var(--ysa473-dark);
            color: white;
            border-radius: var(--ysa473-radius);
            padding: 40px;
            margin-top: 80px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 32px;
        }

        .ysa473-info-text h3 {
            font-size: 1.8rem;
            margin-bottom: 8px;
        }

        .ysa473-info-text p {
            opacity: 0.8;
        }

        .ysa473-btn {
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            display: inline-block;
        }

        .ysa473-btn-primary {
            background: var(--ysa473-primary);
            color: white;
        }

        .ysa473-btn-primary:hover {
            background: #e65a2b;
            transform: scale(1.05);
        }

        /* 页脚 */
        .ysa473-footer {
            background: white;
            padding: 80px 24px 40px;
            border-top: 1px solid var(--ysa473-border);
        }

        .ysa473-footer-inner {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .ysa473-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .ysa473-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--ysa473-primary);
            margin-bottom: 16px;
        }

        .ysa473-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .ysa473-link-group h4 {
            margin-bottom: 20px;
            font-size: 1.1rem;
            color: var(--ysa473-dark);
        }

        .ysa473-link-group ul {
            list-style: none;
        }

        .ysa473-link-group li {
            margin-bottom: 12px;
        }

        .ysa473-link-group a {
            text-decoration: none;
            color: var(--ysa473-gray);
            transition: color 0.3s;
        }

        .ysa473-link-group a:hover {
            color: var(--ysa473-primary);
        }

        .ysa473-copyright {
            width: 100%;
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px solid var(--ysa473-border);
            text-align: center;
            color: var(--ysa473-gray);
            font-size: 0.9rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ysa473-nav-container {
                height: auto;
                padding: 16px;
            }
            .ysa473-menu {
                margin-top: 16px;
                justify-content: center;
            }
            .ysa473-hero {
                padding-top: 140px;
                text-align: center;
            }
            .ysa473-hero-inner {
                justify-content: center;
            }
            .ysa473-hero-subtitle {
                margin: 0 auto 32px;
            }
            .ysa473-search-wrapper {
                margin: 40px auto 0;
            }
            .ysa473-section-grid {
                grid-template-columns: 1fr;
            }
            .ysa473-info-bar {
                text-align: center;
                justify-content: center;
            }
        }