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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, sans-serif;
            background: #fefefe;
            color: #11181c;
            line-height: 1.45;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* 导航风格 - 与首页一致 */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            flex-wrap: wrap;
            gap: 20px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .brand-logo-img {
            width: 38px;
            height: 38px;
            object-fit: contain;
            border-radius: 8px;
            flex-shrink: 0;
        }
        .brand-name {
            font-size: 1.55rem;
            font-weight: 700;
            letter-spacing: -0.4px;
            color: #0c4e6e;
            white-space: nowrap;
        }
        .brand-name span {
            font-weight: 400;
            color: #5a7d8c;
            font-size: 0.85rem;
            letter-spacing: 0;
            margin-left: 2px;
        }
        .nav-links-new {
            display: flex;
            gap: 24px;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links-new a {
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            color: #2c3e50;
            transition: color 0.2s, transform 0.15s;
            position: relative;
            white-space: nowrap;
        }
        .nav-links-new a:hover,
        .nav-links-new a.active {
            color: #1f7b8c;
        }
        .nav-links-new a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: #1f7b8c;
            border-radius: 2px;
            transition: width 0.25s ease;
        }
        .nav-links-new a:hover::after,
        .nav-links-new a.active::after {
            width: 100%;
        }
        .btn-ghost {
            border: 1px solid #cbd5e1;
            padding: 7px 20px;
            border-radius: 100px;
            background: transparent;
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s;
            text-decoration: none;
            color: #2c3e50;
            white-space: nowrap;
        }
        .btn-ghost:hover {
            border-color: #1f7b8c;
            color: #1f7b8c;
            background: #f0faf9;
        }

        /* 页面标题区域 */
        .page-hero {
            padding: 50px 0 30px;
            text-align: center;
            background: #ffffff;
        }
        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #134e6f 0%, #1e6b5e 60%, #2a7f6e 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 12px;
        }
        .page-hero .page-sub {
            color: #3e5a6c;
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.55;
        }

        /* 设备卡片选择 */
        .device-selector-section {
            padding: 20px 0 50px;
            background: #ffffff;
        }
        .device-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }
        .device-card {
            background: #fafcfd;
            border: 1px solid #e8eef3;
            border-radius: 24px;
            padding: 28px 22px;
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 12px;
            position: relative;
            overflow: hidden;
        }
        .device-card:hover {
            transform: translateY(-5px);
            border-color: #b8d8d4;
            box-shadow: 0 16px 32px -12px rgba(15, 110, 106, 0.12);
            background: #ffffff;
        }
        .device-card .card-icon {
            font-size: 2.6rem;
            line-height: 1;
        }
        .device-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: #1a3c4a;
        }
        .device-card p {
            font-size: 0.9rem;
            color: #5c7380;
            line-height: 1.4;
        }
        .device-card .card-link {
            margin-top: auto;
            font-weight: 600;
            color: #1f7b8c;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .card-highlight {
            background: linear-gradient(135deg, #f0faf8 0%, #e6f4f1 100%);
            border-color: #c0dfd9;
        }

        /* 下载前你可能需要 */
        .before-download-section {
            padding: 40px 0 50px;
            background: #f9fbfd;
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #1a3c4a;
            letter-spacing: -0.02em;
        }
        .section-header .section-subtitle {
            color: #5c7380;
            font-size: 0.98rem;
            margin-top: 8px;
        }
        .guide-table {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 16px;
        }
        .guide-item {
            background: white;
            border: 1px solid #e8eef3;
            border-radius: 20px;
            padding: 22px 20px;
            text-decoration: none;
            color: #2c3e50;
            transition: all 0.25s;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .guide-item:hover {
            border-color: #1f7b8c;
            transform: translateY(-2px);
            box-shadow: 0 8px 18px -8px rgba(0,0,0,0.08);
            background: #f6fbfa;
        }
        .guide-item .user-type {
            font-weight: 700;
            font-size: 1rem;
            color: #1a3c4a;
        }
        .guide-item .recommend {
            font-size: 0.85rem;
            color: #5c7380;
        }
        .guide-item .arrow-link {
            color: #1f7b8c;
            font-weight: 600;
            font-size: 0.85rem;
            margin-top: auto;
        }

        /* 版本更新日志 */
        .changelog-section {
            padding: 60px 0;
            background: #ffffff;
        }
        .changelog-container {
            max-width: 900px;
            margin: 0 auto;
            background: #fafcfd;
            border-radius: 32px;
            padding: 40px 36px;
            border: 1px solid #e8eef3;
        }
        .changelog-container h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #1a3c4a;
            margin-bottom: 8px;
        }
        .version-tag {
            display: inline-block;
            background: #e6f7f5;
            color: #0f6e6a;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
            margin-bottom: 20px;
        }
        .changelog-list {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
        }
        .changelog-list li {
            padding: 12px 0;
            border-bottom: 1px solid #e8edf2;
            display: flex;
            align-items: baseline;
            gap: 10px;
            font-size: 0.98rem;
            color: #3e5a6c;
        }
        .changelog-list li:last-child {
            border-bottom: none;
        }
        .changelog-list li::before {
            content: "▹";
            color: #1f7b8c;
            font-weight: 700;
            flex-shrink: 0;
        }
        .older-versions {
            margin-top: 28px;
            border-top: 1px dashed #d0d9e0;
            padding-top: 20px;
            font-size: 0.9rem;
            color: #5c7380;
        }
        .older-versions details {
            margin-top: 8px;
        }
        .older-versions summary {
            cursor: pointer;
            font-weight: 600;
            color: #1f7b8c;
            outline: none;
        }

        /* 页脚 - 与首页一致 */
        .footer-alt {
            background: #f1f5f9;
            border-top: none;
            padding: 44px 0 32px;
            font-size: 0.9rem;
            color: #5c7380;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }
        .footer-col h5 {
            font-weight: 700;
            color: #1a3c4a;
            margin-bottom: 10px;
            font-size: 0.95rem;
        }
        .footer-col a {
            display: block;
            color: #5c7380;
            text-decoration: none;
            margin-bottom: 6px;
            transition: color 0.2s;
            font-size: 0.88rem;
        }
        .footer-col a:hover {
            color: #1f7b8c;
        }
        .footer-bottom {
            text-align: center;
            margin-top: 28px;
            padding-top: 20px;
            border-top: 1px solid #dde4ea;
            font-size: 0.82rem;
            color: #8a9ba7;
        }

        @media (max-width: 780px) {
            .container {
                padding: 0 20px;
            }
            .page-hero h1 {
                font-size: 2.1rem;
            }
            .device-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .changelog-container {
                padding: 28px 22px;
            }
            .nav-links-new {
                gap: 14px;
            }
            .nav-links-new a {
                font-size: 0.85rem;
            }
            .brand-name {
                font-size: 1.3rem;
            }
            .brand-name span {
                display: none;
            }
            .guide-table {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .device-grid {
                grid-template-columns: 1fr;
            }
            .device-card {
                padding: 20px 18px;
            }
            .header-flex {
                gap: 12px;
            }
            .changelog-list li {
                font-size: 0.88rem;
                flex-wrap: wrap;
            }
        }