* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #0b0e17;
            color: #e8edf5;
            line-height: 1.6;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header 与首页保持一致 */
        .header {
            padding: 18px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            position: sticky;
            top: 0;
            background: rgba(11, 14, 23, 0.92);
            backdrop-filter: blur(12px);
            z-index: 100;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }
        .logo span {
            color: #3b82f6;
        }
        .logo small {
            font-size: 12px;
            font-weight: 400;
            color: #8b95a9;
            margin-left: 6px;
            letter-spacing: 0.2px;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 28px;
            font-size: 15px;
            font-weight: 500;
            flex-wrap: wrap;
        }
        .nav a {
            color: #b0baca;
            transition: color 0.2s;
        }
        .nav a:hover {
            color: #fff;
        }
        .nav a.active {
            color: #fff;
            border-bottom: 2px solid #3b82f6;
        }

        /* Page Hero */
        .page-hero {
            padding: 48px 0 32px;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 40px;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.15;
        }
        .page-hero h1 .highlight {
            color: #3b82f6;
        }
        .page-hero .sub {
            margin-top: 16px;
            font-size: 18px;
            color: #aab3c9;
            max-width: 680px;
            margin-left: auto;
            margin-right: auto;
        }
        .page-hero .badge-row {
            margin-top: 22px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }
        .page-hero .badge-row span {
            background: rgba(59, 130, 246, 0.12);
            border: 1px solid rgba(59, 130, 246, 0.20);
            padding: 4px 18px;
            border-radius: 40px;
            font-size: 13px;
            color: #8bb4ff;
        }

        /* 下载卡片区域 */
        .download-section {
            padding: 20px 0 40px;
        }
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 28px;
        }
        .download-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 24px;
            padding: 32px 24px 28px;
            text-align: center;
            transition: background 0.25s, border-color 0.25s, transform 0.2s;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .download-card:hover {
            background: rgba(255, 255, 255, 0.07);
            border-color: rgba(59, 130, 246, 0.35);
            transform: translateY(-4px);
        }
        .download-card .platform-icon {
            font-size: 52px;
            margin-bottom: 12px;
        }
        .download-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .download-card .version-info {
            font-size: 14px;
            color: #8b95a9;
            margin-bottom: 8px;
        }
        .download-card .size-info {
            font-size: 13px;
            color: #6a7a94;
            margin-bottom: 16px;
        }
        .download-card .btn-download {
            color: #fff;
            padding: 12px 36px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 16px;
            transition: transform 0.15s, box-shadow 0.2s;
            display: inline-block;
            width: 100%;
            max-width: 200px;
            border: none;
            text-align: center;
        }
        .download-card .btn-download:hover {
            transform: scale(1.03);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
        }
        .download-card .btn-download.win {
            background: linear-gradient(135deg, #0078d4, #2b88d8);
        }
        .download-card .btn-download.mac {
            background: linear-gradient(135deg, #7a7a7a, #b0b0b0);
        }
        .download-card .btn-download.android {
            background: linear-gradient(135deg, #34a853, #0f9d58);
        }
        .download-card .btn-download.ios {
            background: linear-gradient(135deg, #5856d6, #7c7af0);
        }
        .download-card .checksum {
            margin-top: 14px;
            font-size: 12px;
            color: #5d6a82;
            word-break: break-all;
            background: rgba(255,255,255,0.03);
            padding: 6px 12px;
            border-radius: 8px;
            border: 1px solid rgba(255,255,255,0.04);
            width: 100%;
        }

        /* 创意版块：安全部署三步曲 */
        .secure-steps {
            padding: 40px 0 20px;
        }
        .secure-steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 10px;
        }
        .secure-step {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            padding: 24px 20px;
            text-align: center;
            transition: background 0.2s;
        }
        .secure-step:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        .secure-step .icon {
            font-size: 36px;
            margin-bottom: 10px;
        }
        .secure-step h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
            color: #d0d8e8;
        }
        .secure-step p {
            font-size: 14px;
            color: #aab3c9;
        }

        /* 创意版块：多设备同步矩阵 */
        .device-sync {
            padding: 40px 0 20px;
        }
        .device-sync-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 16px;
            margin-top: 10px;
        }
        .device-sync-item {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 16px;
            padding: 18px 10px;
            text-align: center;
            transition: background 0.2s, border-color 0.2s;
        }
        .device-sync-item:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: rgba(59, 130, 246, 0.25);
        }
        .device-sync-item .icon {
            font-size: 32px;
            margin-bottom: 6px;
        }
        .device-sync-item .label {
            font-size: 14px;
            font-weight: 500;
            color: #d0d8e8;
        }
        .device-sync-item .note {
            font-size: 12px;
            color: #8b95a9;
        }

        /* 版本特性与系统要求 */
        .extra-section {
            padding: 40px 0 20px;
        }
        .extra-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
            margin-top: 16px;
        }
        .extra-card {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            padding: 24px 22px;
        }
        .extra-card h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #d0d8e8;
        }
        .extra-card p, .extra-card li {
            font-size: 15px;
            color: #aab3c9;
            line-height: 1.7;
        }
        .extra-card ul {
            list-style: none;
            padding: 0;
        }
        .extra-card ul li {
            padding: 4px 0;
            padding-left: 20px;
            position: relative;
        }
        .extra-card ul li::before {
            content: "▹";
            position: absolute;
            left: 0;
            color: #3b82f6;
        }
        .extra-card .highlight-num {
            color: #3b82f6;
            font-weight: 600;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            letter-spacing: -0.3px;
            margin-bottom: 6px;
            text-align: center;
        }
        .section-sub {
            color: #8b95a9;
            font-size: 16px;
            text-align: center;
            margin-bottom: 10px;
        }

        /* 正版授权提示 */
        .genuine-banner {
            margin: 30px 0 10px;
            background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(99,102,241,0.05));
            border: 1px solid rgba(59,130,246,0.2);
            border-radius: 20px;
            padding: 28px 24px;
            text-align: center;
        }
        .genuine-banner p {
            font-size: 16px;
            color: #c8d0e0;
            max-width: 800px;
            margin: 0 auto;
        }
        .genuine-banner .highlight-link {
            color: #3b82f6;
            font-weight: 600;
            text-decoration: underline;
        }

        /* Footer 与首页保持一致 */
        .footer {
            margin-top: 50px;
            padding: 36px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 14px;
            color: #7a86a0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 24px;
        }
        .footer-grid .col h5 {
            color: #d0d8e8;
            font-weight: 600;
            font-size: 15px;
            margin-bottom: 10px;
        }
        .footer-grid .col p,
        .footer-grid .col a {
            color: #7a86a0;
            line-height: 1.8;
            display: block;
        }
        .footer-grid .col a:hover {
            color: #c8d0e0;
        }
        .footer-bottom {
            margin-top: 28px;
            padding-top: 18px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: #5d6a82;
        }
        .footer-bottom .version-badge {
            background: rgba(59, 130, 246, 0.10);
            border: 1px solid rgba(59, 130, 246, 0.15);
            padding: 2px 16px;
            border-radius: 40px;
            font-size: 12px;
            color: #8bb4ff;
        }

        /* 页脚下拉工具区（与首页相同） */
        .footer-tools {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            justify-content: center;
        }
        .footer-select {
            position: relative;
            width: 280px;
            max-width: 100%;
        }
        .footer-select-btn {
            width: 100%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #d0d8e8;
            padding: 12px 20px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: background 0.2s, border-color 0.2s;
        }
        .footer-select-btn:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(59, 130, 246, 0.25);
        }
        .footer-select-btn svg {
            transition: transform 0.2s;
        }
        .footer-select.open .footer-select-btn svg {
            transform: rotate(180deg);
        }
        .footer-select-dropdown {
            position: absolute;
            bottom: calc(100% + 8px);
            left: 0;
            right: 0;
            background: #131722;
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            padding: 8px;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 4px;
            max-height: 220px;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
            z-index: 200;
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
        }
        .footer-select.open .footer-select-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .footer-select-dropdown a {
            color: #b0baca;
            font-size: 13px;
            padding: 6px 10px;
            border-radius: 8px;
            transition: background 0.15s, color 0.15s;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .footer-select-dropdown a:hover {
            background: rgba(59, 130, 246, 0.12);
            color: #8bb4ff;
        }

        @media (max-width: 900px) {
            .page-hero h1 {
                font-size: 32px;
            }
            .header-inner {
                flex-direction: column;
                gap: 14px;
            }
            .nav {
                justify-content: center;
                gap: 16px;
                font-size: 14px;
            }
        }
        @media (max-width: 700px) {
            .download-grid {
                grid-template-columns: 1fr 1fr;
            }
            .secure-steps-grid,
            .device-sync-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 480px) {
            .page-hero h1 {
                font-size: 26px;
            }
            .download-grid,
            .secure-steps-grid,
            .device-sync-grid {
                grid-template-columns: 1fr;
            }
            .nav {
                gap: 12px;
                font-size: 13px;
            }
            .extra-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            .footer-select {
                width: 100%;
            }
        }