/* ----- 全局变量与重置 ----- */
        :root {
            --bg: #f9faf7;
            --surface: #ffffff;
            --text: #1d2f22;
            --text-secondary: #4b5e4e;
            --text-muted: #6b7c6d;
            --accent: #2e7d32;
            --accent-dark: #1b5e20;
            --accent-light: #e8f5e9;
            --accent-glow: rgba(46, 125, 50, 0.12);
            --teal: #1b5e20;
            --teal-light: #e8f5e9;
            --border: #e0e6dc;
            --border-light: #eef2eb;
            --shadow-sm: 0 1px 4px rgba(29, 47, 34, 0.04);
            --shadow-md: 0 6px 20px rgba(29, 47, 34, 0.06);
            --shadow-lg: 0 16px 36px rgba(29, 47, 34, 0.09);
            --shadow-xl: 0 24px 48px rgba(29, 47, 34, 0.12);
            --radius-sm: 16px;
            --radius-md: 24px;
            --radius-lg: 36px;
            --radius-xl: 48px;
            --radius-full: 999px;
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: 'Inter', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-stack);
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image:
                radial-gradient(ellipse at 15% 10%, rgba(46, 125, 50, 0.03) 0%, transparent 55%),
                radial-gradient(ellipse at 78% 60%, rgba(27, 94, 32, 0.02) 0%, transparent 50%),
                radial-gradient(ellipse at 40% 85%, rgba(46, 125, 50, 0.02) 0%, transparent 45%);
            background-attachment: fixed;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }
        /* ----- 头部导航 (保持品牌风格) ----- */
        header {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            position: sticky;
            top: 0;
            z-index: 120;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 16px 0;
            gap: 14px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--accent);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 1.25rem;
            letter-spacing: -0.5px;
            box-shadow: 0 4px 14px rgba(46, 125, 50, 0.3);
        }
        .logo-text {
            font-weight: 780;
            font-size: 1.35rem;
            color: var(--text);
            letter-spacing: -0.4px;
        }
        .logo-text span {
            color: var(--accent);
        }
        .nav-links {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
            font-size: 0.93rem;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: var(--text-secondary);
            transition: var(--transition);
            padding: 7px 15px;
            border-radius: var(--radius-full);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent);
            background: var(--accent-light);
        }
        .btn-download-nav {
            background: var(--accent) !important;
            color: #fff !important;
            padding: 9px 22px !important;
            border-radius: var(--radius-full) !important;
            font-weight: 600 !important;
            box-shadow: 0 3px 12px rgba(46, 125, 50, 0.25);
            transition: var(--transition) !important;
        }
        .btn-download-nav:hover {
            background: var(--accent-dark) !important;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(46, 125, 50, 0.35);
        }
        /* ----- 页面主视觉 ----- */
        .page-hero {
            padding: 48px 0 32px;
            text-align: center;
        }
        .page-hero h1 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .page-hero .subhead {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 14px auto 0;
            line-height: 1.6;
        }
        /* ----- 下载卡片区域：外层框架彻底居中（每个卡片独立居中 + 最大宽度优雅展示）----- */
        .download-layer {
            display: flex;
            flex-direction: column;
            gap: 32px;
            margin: 48px auto 40px;;
            align-items: center;  /* 让所有子项在交叉轴上居中 */
        }
        /* 核心修正：每个dl-card都是独立的自适应卡片，强制水平居中 + 最大宽度限制 */
        .dl-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 20px;
            position: relative;
            overflow: hidden;
            width: 100%;
            max-width: 1100px;      /* 关键：限制卡片宽度，让卡片在大屏幕下优雅居中 */
            margin-left: auto;
            margin-right: auto;
        }
        .dl-card:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .dl-card .dl-icon {
            font-size: 2.8rem;
            background: var(--accent-light);
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 24px;
            flex-shrink: 0;
            color: var(--accent);
            box-shadow: 0 4px 14px rgba(46, 125, 50, 0.1);
            margin-bottom: 4px;
        }
        .dl-info {
            flex: auto;
            width: 100%;
            text-align: center;
        }
        .dl-info h3 {
            font-size: 1.45rem;
            font-weight: 750;
            margin-bottom: 6px;
            color: var(--text);
        }
        .badge-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin: 10px 0 14px;
            justify-content: center;
        }
        .platform-badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--teal-light);
            color: var(--teal);
            white-space: nowrap;
        }
        .platform-badge.win {
            background: #e8f0f8;
            color: #2b5a8c;
        }
        .platform-badge.mac {
            background: #f0eef8;
            color: #4b3d78;
        }
        .platform-badge.android {
            background: #e8f5e9;
            color: #2e5c30;
        }
        .dl-info .desc {
            color: var(--text-secondary);
            font-size: 0.94rem;
            line-height: 1.6;
            margin-bottom: 16px;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }
        .dl-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 6px;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 12px 28px;
            border-radius: var(--radius-full);
            text-decoration: none;
            font-weight: 620;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 7px;
            box-shadow: 0 8px 22px rgba(46, 125, 50, 0.28);
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 14px 30px rgba(46, 125, 50, 0.36);
        }
        .btn-outline {
            background: transparent;
            border: 1.6px solid var(--accent);
            color: var(--accent);
            padding: 10px 24px;
            border-radius: var(--radius-full);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.93rem;
            white-space: nowrap;
        }
        .btn-outline:hover {
            background: var(--accent-light);
            border-color: var(--accent-dark);
            color: var(--accent-dark);
            transform: translateY(-2px);
        }
        /* ----- 选择指南网格 (本身已在container中居中) ----- */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 24px;
        }
        .guide-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            text-align: center;
        }
        .guide-card .emoji {
            font-size: 2.4rem;
            margin-bottom: 10px;
        }
        .guide-card h4 {
            font-weight: 700;
            margin-bottom: 6px;
        }
        .guide-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        /* ----- 安全说明区域：外层框架彻底居中 + 最大宽度 + 垂直内容居中 ----- */
        .safety-box {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            margin: 48px auto 40px;   /* 上下外边距保留，左右自动居中 */
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 24px;
            width: 100%;
            max-width: 1100px;         /* 与卡片统一，大屏下不显得过宽，实现框架居中 */
        }
        .safety-box .safety-icon {
            font-size: 2.8rem;
            background: #e8f5e9;
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 24px;
            color: #2e7d32;
            flex-shrink: 0;
        }
        .safety-text {
            max-width: 750px;
            margin: 0 auto;
        }
        .safety-text h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 14px;
            text-align: center;
        }
        .safety-text ul {
            list-style: none;
            padding: 0;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            display: inline-block;
            text-align: left;
            margin: 0 auto;
        }
        .safety-text ul li {
            margin-bottom: 8px;
        }
        .safety-text ul li::before {
            content: "✅ ";
            color: var(--accent);
            font-weight: bold;
        }
        /* ----- SEO长文本区 (天然居中) ----- */
        .long-content {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 40px 36px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            max-width: 900px;
            margin: 0 auto 44px;
        }
        .long-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--teal);
            margin: 24px 0 10px;
            letter-spacing: -0.2px;
        }
        .long-content h3:first-child {
            margin-top: 0;
        }
        .long-content p {
            color: var(--text-secondary);
            margin-bottom: 14px;
            font-size: 0.96rem;
            line-height: 1.7;
        }
        .long-content .highlight-box {
            background: var(--teal-light);
            border-radius: var(--radius-sm);
            padding: 18px 22px;
            margin: 18px 0;
            border-left: 4px solid var(--teal);
            font-size: 0.93rem;
            color: #1e4620;
            line-height: 1.6;
        }
        /* ----- CTA 横幅 (本身背景全宽但内容居中，已有居中)----- */
        .cta-section {
            background: linear-gradient(115deg, #1a2e1f 0%, #254a2b 40%, #1a3620 100%);
            border-radius: var(--radius-xl);
            padding: 50px 36px;
            margin: 44px auto 40px;
            text-align: center;
            color: #fff;
            box-shadow: var(--shadow-xl);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            max-width: 1200px;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(76, 175, 80, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 800;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
            max-width: 600px;
        }
        .cta-section p {
            font-size: 1.05rem;
            opacity: 0.88;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
            max-width: 600px;
        }
        .btn-cta {
            background: #fff;
            color: #1a2e1f;
            padding: 15px 42px;
            border-radius: var(--radius-full);
            font-weight: 700;
            text-decoration: none;
            font-size: 1.05rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 9px;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
            position: relative;
            z-index: 1;
        }
        .btn-cta:hover {
            background: #f2fdf2;
            transform: scale(1.03);
            box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
        }
        /* ----- 页脚 ----- */
        .footer {
            background: #1a2a1c;
            color: #bccfc1;
            padding: 44px 0 24px;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            margin-top: 40px;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 12px;
            font-size: 0.95rem;
            letter-spacing: -0.15px;
        }
        .footer-col a {
            color: #bccfc1;
            text-decoration: none;
            display: block;
            margin-bottom: 7px;
            font-size: 0.87rem;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            font-size: 0.82rem;
            border-top: 1px solid #334c36;
            margin-top: 24px;
            color: #8d9e8f;
        }
        /* 响应式优化 */
        @media (max-width: 900px) {
            .nav-bar {
                flex-direction: column;
                align-items: stretch;
            }
            .nav-links {
                gap: 6px;
                font-size: 0.84rem;
                justify-content: center;
            }
            .nav-links a {
                padding: 6px 12px;
            }
            .dl-card {
                padding: 28px 20px;
                max-width: 100%;
            }
            .safety-box {
                max-width: 100%;
                margin-left: 16px;
                margin-right: 16px;
                width: auto;
            }
            .long-content {
                padding: 24px 18px;
                margin-left: 16px;
                margin-right: 16px;
            }
            .cta-section {
                margin-left: 16px;
                margin-right: 16px;
                max-width: calc(100% - 32px);
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .dl-actions {
                flex-direction: column;
                align-items: center;
                width: 100%;
            }
            .btn-primary, .btn-outline {
                white-space: normal;
                justify-content: center;
                width: 100%;
            }
            .safety-box {
                padding: 24px 18px;
            }
        }