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

        :root {
            --primary-deep: #1A344C;
            --primary-mid: #2B5B82;
            --primary-soft: #4A85B0;
            --accent: #C8782E;
            --accent-light: #E09E58;
            --accent-pale: #F2D4B0;
            --bg-warm: #FAF9F5;
            --bg-card: #FEFDFB;
            --bg-cream: #F5F1E9;
            --border-soft: #E6DFD2;
            --border-hover: #C4B89C;
            --text-dark: #1C2936;
            --text-mid: #455560;
            --text-light: #697880;
            --icon-bg: #EEE8DA;
            --badge-bg: #E4EDF5;
            --badge-text: #356B8A;
            --tag-rec-bg: #E4EDF5;
            --tag-rec-text: #356B8A;
            --tag-pro-bg: #F7EDDF;
            --tag-pro-text: #B07535;
            --footer-bg: #E2D9C8;
            --footer-text: #6B5C44;
            --footer-border: #D2C4A8;
            --card-shadow: 0 12px 32px -10px rgba(0, 0, 0, 0.06);
            --card-shadow-hover: 0 18px 40px -12px rgba(0, 0, 0, 0.10);
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, 'BlinkMacSystemFont', 'Segoe UI', Roboto, Helvetica, sans-serif;
            background: var(--bg-warm);
            color: var(--text-dark);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeSpeed;
            scroll-behavior: smooth;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 28px;
        }

        .skip-link {
            position: absolute;
            top: -100px;
            left: 16px;
            background: var(--primary-deep);
            color: #fff;
            padding: 8px 18px;
            border-radius: 6px;
            z-index: 200;
            text-decoration: none;
            font-weight: 600;
            transition: top 0.3s;
            font-size: 0.9rem;
        }
        .skip-link:focus {
            top: 10px;
        }

        /* ========== Header ========== */
        .header {
            background: rgba(250, 249, 245, 0.94);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border-soft);
        }
        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 15px 0;
            gap: 18px;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 750;
            background: linear-gradient(135deg, var(--primary-mid), var(--accent));
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            gap: 26px;
            align-items: center;
            flex-wrap: wrap;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: var(--text-mid);
            transition: color 0.22s;
            font-size: 0.96rem;
            position: relative;
            padding: 4px 0;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.28s;
            border-radius: 2px;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-badge {
            display: inline-block;
            background: var(--badge-bg);
            color: var(--badge-text);
            font-size: 0.7rem;
            padding: 2px 9px;
            border-radius: 14px;
            margin-left: 3px;
            font-weight: 620;
            vertical-align: middle;
        }

        /* ========== 通用区块 ========== */
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 720;
            margin-bottom: 40px;
            color: var(--primary-deep);
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-light);
            margin-top: -28px;
            margin-bottom: 44px;
            font-size: 0.94rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== 下载卡片 ========== */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 24px;
        }
        .download-card {
            background: var(--bg-card);
            border-radius: 28px;
            padding: 34px 24px;
            border: 1px solid var(--border-soft);
            text-align: center;
            transition: all 0.3s;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
        }
        .download-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-hover);
            box-shadow: var(--card-shadow-hover);
        }
        .os-icon {
            font-size: 2.8rem;
            margin-bottom: 10px;
        }
        .download-card h3 {
            font-size: 1.4rem;
            color: var(--primary-deep);
            margin-bottom: 8px;
            font-weight: 680;
        }
        .download-card .version {
            font-size: 0.85rem;
            color: var(--accent);
            font-weight: 600;
            margin-bottom: 12px;
            background: #FFF3E5;
            padding: 3px 12px;
            border-radius: 20px;
            display: inline-block;
        }
        .download-card .desc {
            font-size: 0.88rem;
            color: var(--text-light);
            margin-bottom: 22px;
            line-height: 1.5;
            flex: 1;
        }
        .btn-download {
            background: var(--primary-mid);
            color: #fff;
            padding: 12px 28px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 620;
            transition: all 0.25s;
            box-shadow: 0 6px 16px rgba(43, 91, 130, 0.22);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.95rem;
            margin-top: auto;
        }
        .btn-download:hover {
            background: #1F4D6E;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(43, 91, 130, 0.32);
        }
        .platform-badge {
            display: block;
            margin-top: 6px;
            font-size: 0.75rem;
            color: var(--text-light);
            font-weight: 500;
        }

        /* ========== 安装指南 ========== */
        .steps-list {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            justify-content: center;
            counter-reset: install-step;
        }
        .step-item {
            flex: 1;
            min-width: 200px;
            max-width: 280px;
            background: var(--bg-card);
            border-radius: 24px;
            padding: 28px 18px 20px;
            border: 1px solid var(--border-soft);
            text-align: center;
            position: relative;
            transition: 0.3s;
            counter-increment: install-step;
        }
        .step-item::after {
            content: counter(install-step);
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .step-item h4 {
            font-size: 1.05rem;
            color: var(--primary-deep);
            margin: 10px 0 6px;
            font-weight: 650;
        }
        .step-item p {
            font-size: 0.83rem;
            color: var(--text-light);
            line-height: 1.5;
        }

        /* ========== 更新日志 ========== */
        .changelog-box {
            background: var(--bg-card);
            border-radius: 24px;
            border: 1px solid var(--border-soft);
            padding: 30px;
            max-width: 800px;
            margin: 0 auto;
            box-shadow: var(--card-shadow);
        }
        .changelog-box h3 {
            font-size: 1.3rem;
            color: var(--primary-deep);
            margin-bottom: 14px;
            font-weight: 680;
        }
        .changelog-list {
            list-style: none;
            padding: 0;
        }
        .changelog-list li {
            padding: 8px 0;
            border-bottom: 1px dashed #EDE5D4;
            display: flex;
            align-items: baseline;
            gap: 10px;
            font-size: 0.92rem;
            color: var(--text-mid);
        }
        .changelog-list li::before {
            content: "▹";
            color: var(--accent);
            font-weight: bold;
            font-size: 1.1rem;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: 16px;
            padding: 18px 22px;
            border: 1px solid var(--border-soft);
            transition: 0.25s;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.015);
        }
        .faq-item:hover {
            border-color: var(--border-hover);
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);
        }
        .faq-item h4 {
            font-size: 1rem;
            color: var(--primary-deep);
            margin-bottom: 6px;
            font-weight: 650;
        }
        .faq-item p {
            font-size: 0.88rem;
            color: var(--text-mid);
            line-height: 1.6;
        }

        /* CTA */
        .cta-band {
            padding: 58px 0;
            background: linear-gradient(145deg, #FBF9F4 0%, #F3ECE0 100%);
            text-align: center;
            border-top: 1px solid var(--border-soft);
            border-bottom: 1px solid var(--border-soft);
        }
        .cta-band h2 {
            font-size: 1.85rem;
            font-weight: 750;
            color: var(--primary-deep);
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .cta-band p {
            font-size: 1rem;
            color: var(--text-mid);
            margin-bottom: 24px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary {
            background: var(--primary-mid);
            color: #fff;
            padding: 13px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 620;
            transition: all 0.26s;
            box-shadow: 0 6px 18px rgba(43, 91, 130, 0.24);
            display: inline-flex;
            align-items: center;
            gap: 7px;
            font-size: 1rem;
            letter-spacing: 0.2px;
        }
        .btn-primary:hover {
            background: #1F4D6E;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(43, 91, 130, 0.32);
        }

        /* Footer （与首页一致） */
        .footer {
            background: var(--footer-bg);
            color: var(--footer-text);
            padding: 46px 0 24px;
            font-size: 0.86rem;
            border-top: 1px solid var(--footer-border);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-col h4 {
            color: #7A6A50;
            margin-bottom: 14px;
            font-weight: 620;
            font-size: 0.93rem;
        }
        .footer-col a {
            display: block;
            color: #8B7052;
            text-decoration: none;
            margin-bottom: 8px;
            transition: 0.2s;
            font-size: 0.84rem;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--footer-border);
            color: #A08A6A;
            font-size: 0.8rem;
        }

        @media (max-width: 768px) {
            .navbar {
                flex-direction: column;
            }
            .nav-links {
                justify-content: center;
                gap: 14px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .download-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
        }