/* 由 ks100\software-download.html 内联 <style> 整体外置（步骤⑩方案A，2026-08-06）
   规则原样迁移，零改写，视觉零回归。 */


        body {
            font-family: var(--font-sans);
            background-color: var(--color-bg);
            color: var(--sd-text-primary);
            line-height: 1.6;
        }

        .hero-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 80px 20px 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 40px;
            background: linear-gradient(to bottom, var(--primary), transparent);
            opacity: 0.3;
        }

        .hero-content {
            position: relative;
            z-index: var(--z-content);
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            padding: 8px 20px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 1px;
        }

        .hero-title {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -1px;
        }

        .hero-subtitle {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .download-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .download-btn {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 16px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 12px;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            border: none;
            outline: none;
        }

        .download-btn-primary {
            background: white;
            color: var(--primary);
            box-shadow: var(--shadow);
        }

        .download-btn-primary:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .download-btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .download-btn-secondary:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-4px);
        }

        .download-btn svg {
            width: 24px;
            height: 24px;
        }

        .download-btn img {
            width: 24px;
            height: 24px;
            filter: none;
        }

        .info-cards {
            max-width: 1200px;
            margin: -60px auto 80px;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
            position: relative;
            z-index: var(--z-content-high);
        }

        .info-card {
            background: white;
            border-radius: 16px;
            padding: 32px;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid var(--border);
        }

        .info-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
        }

        .info-card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 24px;
        }

        .info-card-icon.blue {
            background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
            color: var(--secondary);
        }

        .info-card-icon.green {
            background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
            color: var(--success);
        }

        .info-card-icon.purple {
            background: linear-gradient(135deg, #F5F3FF 0%, #EDE9FE 100%);
            color: var(--secondary);
        }

        .info-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--sd-text-primary);
        }

        .info-card p {
            font-size: 14px;
            color: var(--sd-text-secondary);
            line-height: 1.7;
        }

        .info-card ul, .info-card ol {
            padding-left: 20px;
            margin-top: 16px;
        }

        .info-card li {
            font-size: 14px;
            color: var(--sd-text-secondary);
            margin-bottom: 10px;
            line-height: 1.6;
        }

        .features-section {
            max-width: 1200px;
            margin: 0 auto 80px;
            padding: 0 20px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--sd-text-primary);
        }

        .section-description {
            font-size: 16px;
            color: var(--sd-text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .feature-item {
            background: white;
            border-radius: 12px;
            padding: 24px;
            text-align: center;
            border: 1px solid var(--border);
            transition: all 0.3s ease;
        }

        .feature-item:hover {
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(59, 130, 246, 0.1);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 20px;
        }

        .feature-icon.safe {
            background: #EFF6FF;
            color: var(--primary);
        }

        .feature-icon.speed {
            background: #FEF3C7;
            color: #F59E0B;
        }

        .feature-icon.easy {
            background: #ECFDF5;
            color: var(--success);
        }

        .feature-icon.sync {
            background: #F3E8FF;
            color: var(--secondary);
        }

        .feature-item h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .feature-item p {
            font-size: 13px;
            color: var(--sd-text-secondary);
        }

        .mobile-download-container {
            width: 100%;
            padding: 0 20px 20px;
            box-sizing: border-box;
        }

        .mobile-hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 40px 20px;
            text-align: center;
            border-radius: 0 0 24px 24px;
        }

        .mobile-hero h1 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .mobile-hero p {
            font-size: 14px;
            opacity: 0.9;
            margin-bottom: 24px;
        }

        .mobile-download-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 24px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 10px;
            text-decoration: none;
            margin-bottom: 12px;
            transition: all 0.3s ease;
        }

        .mobile-download-btn.android {
            background: white;
            color: var(--primary);
        }

        .mobile-download-btn.ios {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .mobile-section {
            background: white;
            border-radius: 16px;
            padding: 24px;
            margin-top: 20px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
        }

        .mobile-section h2 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .mobile-section p {
            font-size: 14px;
            color: var(--sd-text-secondary);
            margin-bottom: 16px;
        }

        .mobile-section ul, .mobile-section ol {
            padding-left: 20px;
        }

        .mobile-section li {
            font-size: 14px;
            color: var(--sd-text-secondary);
            margin-bottom: 8px;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-fade-in-up {
            animation: fadeInUp 0.6s ease-out forwards;
        }

        .delay-100 {
            animation-delay: 0.1s;
        }

        .delay-200 {
            animation-delay: 0.2s;
        }

        .delay-300 {
            animation-delay: 0.3s;
        }

        .opacity-0 {
            opacity: 0;
        }

        .toast-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: var(--z-popup);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }

        .toast-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .coming-soon-toast {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.9);
            background: var(--surface-card, #FFFFFF);
            border-radius: 20px;
            padding: 40px 60px;
            z-index: var(--z-popup-overlay);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--sd-toast-shadow, 0 25px 60px rgba(0, 0, 0, 0.2), 0 0 40px rgba(59, 130, 246, 0.15));
            text-align: center;
            border: 1px solid var(--border);
        }

        .coming-soon-toast.show {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, -50%) scale(1);
        }

        .coming-soon-toast-icon {
            width: 60px;
            height: 60px;
            background: var(--sd-toast-icon-bg, linear-gradient(135deg, var(--primary), var(--secondary)));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }

        .coming-soon-toast-icon svg {
            width: 30px;
            height: 30px;
            color: white;
        }

        .coming-soon-toast h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--sd-text-primary);
            margin-bottom: 8px;
        }

        .coming-soon-toast p {
            font-size: 14px;
            color: var(--sd-text-secondary);
        }

        .toast-action-hint {
            margin-top: 20px;
            padding-top: 16px;
            border-top: 1px solid var(--border);
            font-size: 13px;
            color: var(--sd-text-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }

        .toast-action-hint .toast-countdown {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 22px;
            height: 22px;
            padding: 0 6px;
            background: var(--sd-toast-countdown-bg, rgba(59, 130, 246, 0.1));
            border-radius: 100px;
            font-size: 12px;
            font-weight: 700;
            color: var(--sd-toast-countdown-color, var(--primary));
            transition: transform 0.3s ease;
        }

        .toast-action-hint .toast-countdown.pulse {
            animation: countdown-pulse 0.5s ease;
        }

        @keyframes countdown-pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.3); }
            100% { transform: scale(1); }
        }

        .toast-close-btn {
            position: absolute;
            top: 12px;
            right: 12px;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: none;
            background: var(--bg-light);
            color: var(--sd-text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }

        .toast-close-btn:hover {
            background: var(--border);
            color: var(--sd-text-primary);
        }

        .toast-close-btn svg {
            width: 18px;
            height: 18px;
        }

        @media (max-width: 768px) {
            .coming-soon-toast {
                width: calc(100% - 48px);
                max-width: 340px;
                padding: 36px 28px 32px;
                border-radius: 24px;
                left: 50%;
                top: 50%;
            }

            .coming-soon-toast-icon {
                width: 64px;
                height: 64px;
                margin-bottom: 20px;
            }

            .coming-soon-toast-icon svg {
                width: 32px;
                height: 32px;
            }

            .coming-soon-toast h3 {
                font-size: 20px;
                font-weight: 700;
                margin-bottom: 10px;
                line-height: 1.4;
            }

            .coming-soon-toast p {
                font-size: 14px;
                color: var(--sd-text-secondary);
                line-height: 1.6;
            }
        }

        .download-toast {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.9);
            background: var(--sd-download-toast-bg, rgba(18, 18, 26, 0.98));
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--sd-download-toast-border, rgba(99, 102, 241, 0.3));
            border-radius: 20px;
            padding: 40px 60px;
            z-index: var(--z-popup-overlay);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--sd-download-toast-shadow, 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(99, 102, 241, 0.15));
            text-align: center;
            max-width: 420px;
        }

        .download-toast.show {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, -50%) scale(1);
        }

        .download-toast-icon {
            width: 64px;
            height: 64px;
            background: var(--sd-download-icon-bg, linear-gradient(135deg, #10b981, #34d399));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }

        .download-toast-icon svg {
            width: 32px;
            height: 32px;
            color: white;
        }

        .download-toast h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--sd-download-title-color, #f1f5f9);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .download-toast > p {
            font-size: 14px;
            color: var(--sd-download-subtitle-color, rgba(241, 245, 249, 0.75));
            line-height: 1.6;
        }

        .download-toast .toast-guidance {
            margin-top: 16px;
            padding: 12px 16px;
            background: var(--sd-download-guidance-bg, rgba(99, 102, 241, 0.1));
            border-radius: 12px;
            text-align: left;
        }

        .download-toast .toast-guidance p {
            font-size: 13px;
            color: var(--sd-download-guidance-text, rgba(241, 245, 249, 0.85));
            line-height: 1.6;
            margin: 0;
        }

        .download-toast .toast-guidance .highlight {
            color: var(--sd-download-guidance-highlight, #818cf8);
            font-weight: 600;
        }

        .download-toast .toast-action-hint {
            border-top: 1px solid var(--sd-download-action-hint-border, rgba(255, 255, 255, 0.08));
            color: var(--sd-download-action-hint-color, #94a3b8);
            font-size: 12px;
        }

        .download-toast .toast-action-hint .toast-countdown {
            background: var(--sd-download-countdown-bg, rgba(99, 102, 241, 0.2));
            color: var(--sd-download-countdown-color, #818cf8);
        }

        .download-toast .toast-close-btn {
            background: var(--sd-download-close-btn-bg, rgba(255, 255, 255, 0.08));
            color: var(--sd-download-close-btn-color, #94a3b8);
        }

        .download-toast .toast-close-btn:hover {
            background: var(--sd-download-close-btn-active-bg, rgba(255, 255, 255, 0.15));
        }

        .download-toast .toast-close-btn:active {
            background: var(--sd-download-close-btn-active-bg, rgba(255, 255, 255, 0.15));
        }

        @media (max-width: 768px) {
            .download-toast {
                width: calc(100% - 48px);
                max-width: 340px;
                padding: 36px 28px 32px;
                border-radius: 24px;
            }
            .download-toast h3 {
                font-size: 19px;
            }
        }

        /* ===== 桌面端样式 (参考 quick-start.html) ===== */
        @media (min-width: 769px) {
            body {
                margin: 0 !important;
                padding: 0 !important;
                font-family: var(--font-sans);
                color: var(--guide-ink);
                -webkit-font-smoothing: antialiased;
            }

            header {
                position: relative;
                z-index: var(--z-toast);
                height: 56px !important;
                margin-bottom: 0 !important;
                box-shadow: 0 1px 0 rgba(0,0,0,0.06) !important;
                padding: 0 !important;
                background: rgba(255,255,255,0.85) !important;
                backdrop-filter: saturate(180%) blur(20px);
            }

            main {
                padding-top: 0 !important;
            }

            .ks100-nav ul li a {
                line-height: 56px !important;
                font-size: 15px;
                color: #333;
                text-decoration: none;
                transition: color 0.2s ease;
            }
            .ks100-nav ul li a:hover {
                color: var(--guide-blue);
            }

            /* 本页为移动端专属下载页：强制移动端布局，不做桌面/移动分离
               （覆盖 device-toggle.css 的桌面端显隐规则，保证桌面宽度下也显示移动菜单与移动内容） */
            .desktop-menu { display: none !important; }
            .mobile-menu { display: block !important; }
            .mobile-content { display: block !important; }
            #popup-menu { display: block !important; }
            #menu-overlay { display: block !important; }

            /* ===== 桌面端 Hero ===== */
            .hero-section {
                position: relative;
                padding: 100px 60px 110px;
                background: var(--bg-page-gradient);
                overflow: hidden;
            }
            .hero-section::before {
                content: "";
                position: absolute;
                top: -120px;
                right: -80px;
                width: 480px;
                height: 480px;
                background: radial-gradient(circle, rgba(66,133,244,0.18) 0%, transparent 70%);
                border-radius: 50%;
                pointer-events: none;
            }
            .hero-section::after {
                content: "";
                position: absolute;
                bottom: -160px;
                left: -100px;
                width: 400px;
                height: 400px;
                background: radial-gradient(circle, rgba(25,118,210,0.1) 0%, transparent 70%);
                border-radius: 50%;
                pointer-events: none;
            }
            .hero-content {
                position: relative;
                z-index: var(--z-content);
                max-width: 1200px;
                margin: 0 auto;
                text-align: left;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 60px;
                align-items: center;
            }
            .hero-badge {
                display: inline-block;
                background: rgba(25, 118, 210, 0.08);
                color: var(--guide-blue);
                padding: 8px 20px;
                border-radius: 999px;
                font-size: 13px;
                font-weight: 700;
                margin-bottom: 24px;
                letter-spacing: 4px;
                text-transform: uppercase;
                backdrop-filter: blur(10px);
            }
            .hero-title {
                font-size: clamp(40px, 5vw, 56px);
                font-weight: 800;
                margin-bottom: 18px;
                letter-spacing: -1px;
                line-height: 1.15;
                color: var(--guide-ink);
            }
            .hero-title em {
                font-style: normal;
                font-weight: 800;
                background: linear-gradient(135deg, #1976D2 0%, #4285F4 100%);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
            }
            .hero-subtitle {
                font-size: 17px;
                line-height: 1.75;
                color: var(--guide-muted);
                max-width: 560px;
                margin: 0 0 32px;
                font-weight: 400;
            }
            .download-buttons {
                display: flex;
                gap: 16px;
                flex-wrap: wrap;
            }
            .download-btn {
                display: inline-flex;
                align-items: center;
                gap: 10px;
                padding: 14px 28px;
                font-size: 15px;
                font-weight: 600;
                border-radius: 12px;
                text-decoration: none;
                transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
                cursor: pointer;
                border: none;
                outline: none;
            }
            .download-btn-primary {
                background: linear-gradient(135deg, #1976D2, #4285F4);
                color: #fff;
                box-shadow: 0 4px 14px rgba(25, 118, 210, 0.3);
            }
            .download-btn-primary:hover {
                transform: translateY(-4px);
                box-shadow: 0 8px 24px rgba(25, 118, 210, 0.4);
            }
            .download-btn-secondary {
                background: rgba(255, 255, 255, 0.8);
                color: var(--guide-ink);
                border: 1px solid var(--guide-line);
                backdrop-filter: blur(10px);
            }
            .download-btn-secondary:hover {
                background: #FFFFFF;
                transform: translateY(-4px);
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            }
            .download-btn svg {
                width: 22px;
                height: 22px;
            }
            .download-btn img {
                width: 22px;
                height: 22px;
                filter: none;
            }
            .download-btn-primary img {
                filter: brightness(0) invert(1);
            }

            /* 桌面端 Hero 右侧侧边栏 */
            .hero-aside {
                display: flex;
                flex-direction: column;
                gap: 16px;
            }
            .hero-aside-row {
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 18px 22px;
                background: rgba(255, 255, 255, 0.7);
                border: 1px solid rgba(25, 118, 210, 0.1);
                border-radius: 12px;
                backdrop-filter: blur(10px);
            }
            .hero-aside-label {
                font-size: 13px;
                color: var(--guide-muted);
                font-weight: 500;
            }
            .hero-aside-value {
                font-size: 22px;
                font-weight: 800;
                color: var(--guide-ink);
                line-height: 1;
            }
            .hero-aside-value em {
                font-style: normal;
                color: var(--guide-blue);
                font-weight: 800;
            }

            /* ===== 设备切换器 (类似quick-start) ===== */
            .guide-toggle-wrap {
                max-width: 1800px;
                margin: 0 auto;
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 24px 60px;
                background: var(--guide-surface);
                border-bottom: 1px solid var(--guide-line);
            }
            .guide-toggle-crumbs {
                font-size: 13px;
                font-weight: 500;
                color: var(--guide-muted);
                display: flex;
                align-items: center;
                gap: 10px;
            }
            .guide-toggle-crumbs .dot {
                width: 8px;
                height: 8px;
                border-radius: 50%;
                background: var(--guide-blue);
                box-shadow: 0 0 0 4px var(--guide-blue-light);
            }

            /* ===== 内容容器 ===== */
            .desktop-content {
                margin-top: 0;
            }

            /* ===== 信息卡片区 ===== */
            .info-cards {
                max-width: 1200px;
                margin: -60px auto 60px;
                padding: 0 60px;
                display: grid;
                grid-template-columns: repeat(3, 1fr);
                gap: 24px;
                position: relative;
                z-index: var(--z-content-high);
            }
            .info-card {
                background: var(--guide-surface);
                border-radius: 16px;
                padding: 32px 28px;
                box-shadow: 0 4px 24px rgba(25, 118, 210, 0.06);
                transition: transform 0.3s ease, box-shadow 0.3s ease;
                border: 1px solid var(--guide-line);
            }
            .info-card:hover {
                transform: translateY(-6px);
                box-shadow: 0 12px 40px rgba(25, 118, 210, 0.1);
            }
            .info-card-icon {
                width: 56px;
                height: 56px;
                border-radius: 16px;
                display: flex;
                align-items: center;
                justify-content: center;
                margin-bottom: 20px;
                font-size: 24px;
            }
            .info-card-icon.blue {
                background: linear-gradient(135deg, #EBF3FF 0%, #DDE9FF 100%);
                color: var(--guide-blue);
            }
            .info-card-icon.green {
                background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
                color: var(--success);
            }
            .info-card-icon.purple {
                background: linear-gradient(135deg, #F3E8FF 0%, #EDE9FE 100%);
                color: var(--secondary);
            }
            .info-card h3 {
                font-size: 20px;
                font-weight: 700;
                margin-bottom: 12px;
                color: var(--guide-ink);
                letter-spacing: -0.3px;
            }
            .info-card p {
                font-size: 14px;
                color: var(--guide-muted);
                line-height: 1.7;
                margin: 0 0 12px;
            }
            .info-card ul, .info-card ol {
                padding-left: 20px;
                margin: 0;
            }
            .info-card li {
                font-size: 14px;
                color: var(--guide-muted);
                margin-bottom: 8px;
                line-height: 1.65;
            }
            .info-card li:last-child {
                margin-bottom: 0;
            }

            /* ===== 特色功能区 ===== */
            .features-section {
                max-width: 1200px;
                margin: 0 auto 80px;
                padding: 60px 60px 0;
            }
            .section-header {
                text-align: center;
                margin-bottom: 48px;
            }
            .section-title {
                font-size: 32px;
                font-weight: 800;
                margin-bottom: 12px;
                color: var(--guide-ink);
                letter-spacing: -0.5px;
            }
            .section-title em {
                font-style: normal;
                background: linear-gradient(135deg, #1976D2 0%, #4285F4 100%);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
            }
            .section-description {
                font-size: 16px;
                color: var(--guide-muted);
                max-width: 600px;
                margin: 0 auto;
                line-height: 1.7;
            }
            .features-grid {
                display: grid;
                grid-template-columns: repeat(4, 1fr);
                gap: 20px;
            }
            .feature-item {
                background: var(--guide-surface);
                border-radius: 14px;
                padding: 28px 20px;
                text-align: center;
                border: 1px solid var(--guide-line);
                transition: all 0.3s ease;
            }
            .feature-item:hover {
                border-color: rgba(25, 118, 210, 0.3);
                box-shadow: 0 8px 24px rgba(25, 118, 210, 0.08);
                transform: translateY(-4px);
            }
            .feature-icon {
                width: 52px;
                height: 52px;
                border-radius: 14px;
                display: flex;
                align-items: center;
                justify-content: center;
                margin: 0 auto 16px;
                font-size: 22px;
            }
            .feature-icon.safe {
                background: linear-gradient(135deg, #EBF3FF 0%, #DDE9FF 100%);
                color: var(--guide-blue);
            }
            .feature-icon.speed {
                background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
                color: #F59E0B;
            }
            .feature-icon.easy {
                background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
                color: var(--success);
            }
            .feature-icon.sync {
                background: linear-gradient(135deg, #F3E8FF 0%, #EDE9FE 100%);
                color: var(--secondary);
            }
            .feature-item h4 {
                font-size: 16px;
                font-weight: 700;
                margin-bottom: 8px;
                color: var(--guide-ink);
            }
            .feature-item p {
                font-size: 13px;
                color: var(--guide-muted);
                line-height: 1.6;
                margin: 0;
            }

            /* ===== 入场动画 ===== */
            .animate-fade-in-up {
                opacity: 1;
                transform: translateY(0);
            }
            .opacity-0 {
                opacity: 1;
            }
        }

        /* ===== 美化新增：版本徽章 / 设备切换 / 扫码卡 / 信任条 / 平台切换 / 扫码弹窗 ===== */

        /* 版本徽章 */
        .hero-version {
            display: inline-block;
            margin-left: 10px;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 700;
            color: var(--guide-blue);
            background: rgba(25, 118, 210, 0.10);
            border-radius: 999px;
            letter-spacing: 0.5px;
            vertical-align: middle;
        }

        /* 下载按钮内文字（主标题 + 副标题） */
        .download-btn { font-family: inherit; }
        .btn-label { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.25; }
        .btn-label small { font-size: 11px; font-weight: 500; opacity: 0.85; margin-top: 2px; }

        /* 设备切换器（复用 quick-start 风格） */
        .guide-device-toggle {
            display: inline-flex;
            align-items: center;
            background: var(--guide-surface-card);
            border: 1px solid var(--guide-line);
            border-radius: 999px;
            padding: 4px;
            position: relative;
            cursor: pointer;
            user-select: none;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .guide-device-option {
            position: relative;
            z-index: var(--z-content-high);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 22px;
            font-size: 13px;
            font-weight: 500;
            color: var(--guide-muted);
            border-radius: 999px;
            transition: color 0.3s ease;
            cursor: pointer;
        }
        .guide-device-option.active { color: #fff !important; font-weight: 600; }
        .guide-device-thumb {
            position: absolute;
            top: 4px;
            left: 4px;
            height: calc(100% - 8px);
            width: 0;
            background: linear-gradient(135deg, #1976D2, #4285F4);
            border-radius: 999px;
            transition: transform 0.4s cubic-bezier(0.65,0,0.35,1), width 0.4s cubic-bezier(0.65,0,0.35,1);
            z-index: var(--z-content);
            box-shadow: 0 4px 14px rgba(25,118,210,0.3);
        }
        .guide-device-option svg { width: 16px; height: 16px; flex-shrink: 0; }

        /* 扫码下载卡（桌面 Hero 右侧） */
        .download-qr-card {
            background: var(--guide-surface);
            border: 1px solid var(--guide-line);
            border-radius: 16px;
            padding: 20px;
            box-shadow: 0 4px 24px rgba(25,118,210,0.06);
            text-align: center;
        }
        .download-qr-card .qr-img {
            width: 140px; height: 140px;
            border-radius: 12px;
            border: 1px solid var(--guide-line);
            display: block;
            margin: 0 auto 12px;
        }
        .download-qr-card .qr-title { font-size: 15px; font-weight: 700; color: var(--guide-ink); }
        .download-qr-card .qr-desc { font-size: 12px; color: var(--guide-muted); margin-top: 4px; }
        .qr-placeholder {
            width: 140px; height: 140px;
            margin: 0 auto 12px;
            border-radius: 12px;
            border: 1px dashed var(--guide-line);
            background: var(--guide-surface-alt);
            display: flex; flex-direction: column;
            align-items: center; justify-content: center;
            gap: 6px; color: var(--guide-muted);
        }
        .qr-placeholder svg { width: 36px; height: 36px; color: var(--guide-blue); }

        /* 移动端扫码卡 */
        .mobile-qr-card { margin: 20px auto 0; text-align: center; }
        .mobile-qr-card img { width: 150px; height: 150px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.35); }
        .mobile-qr-card span { display: block; margin-top: 8px; font-size: 13px; color: rgba(255,255,255,0.92); }
        .mobile-hero h1 em {
            font-style: normal; font-weight: 800;
            color: #FFFFFF; -webkit-text-fill-color: #FFFFFF;
        }
        .mobile-hero .hero-version {
            color: #FFFFFF;
            background: rgba(255,255,255,0.18);
            border: 1px solid rgba(255,255,255,0.25);
        }

        /* 平台切换可见性（默认 Android） */
        .plat-ios { display: none; }
        body.platform-ios .plat-android { display: none !important; }
        body.platform-ios .plat-ios { display: block; }
        body.platform-ios .plat-ios.flex { display: flex; }

    

        /* 统一页眉菜单层级：确保在弹出菜单遮罩之上（不被半透明遮罩压暗） */
        @media (max-width: 768px) {
            header {
                position: relative !important;
                z-index: var(--z-nav-header) !important;
            }
            /* 取消 landing.css main { padding: 2rem 0 } 带来的 32px 顶部留白，让 .kx-m-hero 紧贴 header（不影响 landing.css 其它页） */
            main {
                padding-top: 0 !important;
            }
        }
        /* ===== 爆款优化：促销条 / 吸底下载栏 / 按钮高光 ===== */
        .promo-bar {
            max-width: 1200px;
            margin: 24px auto 0;
            padding: 12px 24px;
            background: linear-gradient(135deg, rgba(25,118,210,0.08), rgba(66,133,244,0.06));
            border: 1px solid rgba(25,118,210,0.15);
            border-radius: 12px;
            text-align: center;
            font-size: 14px;
            color: var(--guide-ink);
        }
        .promo-bar strong { color: var(--guide-blue); }

        .sticky-download {
            position: fixed;
            left: 50%;
            bottom: 22px;
            transform: translateX(-50%) translateY(160%);
            width: min(560px, calc(100% - 32px));
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 12px 16px;
            background: rgba(255,255,255,0.96);
            backdrop-filter: saturate(180%) blur(14px);
            border: 1px solid var(--guide-line);
            border-radius: 16px;
            box-shadow: 0 14px 44px rgba(25,118,210,0.20);
            z-index: var(--z-popup);
            transition: transform 0.45s cubic-bezier(0.4,0,0.2,1);
        }
        .sticky-download.show { transform: translateX(-50%) translateY(0); }
        .sticky-download-info { display: flex; flex-direction: column; line-height: 1.3; }
        .sticky-download-info strong { font-size: 15px; color: var(--guide-ink); }
        .sticky-download-info span { font-size: 12px; color: var(--guide-muted); }
        .sticky-download .download-btn { padding: 12px 22px; margin-left: auto; }
        .sticky-download .download-btn img { width: 18px; height: 18px; }
        .sticky-download .download-btn-primary img { filter: brightness(0) invert(1); }

        /* 主按钮高光扫光 */
        .download-btn-primary { position: relative; overflow: hidden; }
        .download-btn-primary::after {
            content: "";
            position: absolute;
            top: 0;
            left: -60%;
            width: 40%;
            height: 100%;
            background: linear-gradient(120deg, transparent, rgba(255,255,255,0.45), transparent);
            transform: skewX(-20deg);
            animation: btn-shine 3.5s ease-in-out infinite;
            pointer-events: none;
        }
        @keyframes btn-shine {
            0%, 60% { left: -60%; }
            80%, 100% { left: 130%; }
        }

        @media (max-width: 768px) {
            .sticky-download { bottom: 12px; }
            .sticky-download-info strong { font-size: 14px; }
            .sticky-download .download-btn { padding: 11px 18px; }
        }
    

        /* ===== 科技感重设计 · KS100 下载页（保持蓝色调） ===== */
        :root{
            --kx-blue:#1565d8;
            --kx-blue-2:#1e88e5;
            --kx-navy:#0a1f4d;
            --kx-cyan:#38bdf8;
            --kx-line:rgba(21,101,216,.16);
            --kx-glow:rgba(56,189,248,.45);
            --kx-ink:#0f1b33;
            --kx-muted:#5b6b86;
        }
        .kx-promo{
            max-width:1200px;margin:22px auto 0;padding:11px 22px;
            display:flex;align-items:center;gap:10px;justify-content:center;text-align:center;
            font-size:14px;color:var(--kx-ink);
            background:linear-gradient(135deg,rgba(21,101,216,.07),rgba(56,189,248,.06));
            border:1px solid var(--kx-line);border-radius:999px;
            box-shadow:0 6px 24px rgba(21,101,216,.08);
        }
        .kx-promo-dot{width:8px;height:8px;border-radius:50%;background:var(--kx-cyan);box-shadow:0 0 10px var(--kx-glow);animation:kx-pulse 1.8s infinite;}
        .kx-promo strong{color:var(--kx-blue);}
        @keyframes kx-pulse{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.5;transform:scale(.7);}}

        .kx-hero{position:relative;overflow:hidden;max-width:1200px;margin:18px auto 0;
            background:linear-gradient(135deg,#0b3a8f 0%,#1565d8 55%,#1e88e5 100%);
            border-radius:28px;padding:60px 48px;color:#fff;}
        .kx-hero-grid{position:absolute;inset:0;opacity:.16;
            background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
            background-size:44px 44px;
            -webkit-mask-image:radial-gradient(circle at 30% 20%,#000,transparent 78%);
            mask-image:radial-gradient(circle at 30% 20%,#000,transparent 78%);
            animation:kx-grid 18s linear infinite;}
        @keyframes kx-grid{from{background-position:0 0;}to{background-position:44px 44px;}}
        .kx-hero-glow{position:absolute;width:520px;height:520px;right:-120px;top:-160px;border-radius:50%;
            background:radial-gradient(circle,rgba(56,189,248,.5),transparent 60%);filter:blur(20px);animation:kx-float 7s ease-in-out infinite;}
        @keyframes kx-float{0%,100%{transform:translateY(0);}50%{transform:translateY(26px);}}
        .kx-hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.3fr .9fr;gap:48px;align-items:center;max-width:1120px;margin:0 auto;}

        .kx-eyebrow{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.22em;text-transform:uppercase;
            color:#bfe3ff;padding:6px 12px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(255,255,255,.08);}
        .kx-title{font-size:clamp(30px,4.4vw,52px);line-height:1.12;margin:18px 0 14px;font-weight:800;letter-spacing:-.5px;}
        .kx-title em{font-style:normal;background:linear-gradient(90deg,#7dd3fc,#fff);-webkit-background-clip:text;background-clip:text;color:transparent;}
        .kx-sub{font-size:16px;line-height:1.8;color:rgba(255,255,255,.86);max-width:520px;}
        .kx-cta{display:flex;gap:14px;margin:26px 0 18px;flex-wrap:wrap;}
        .kx-btn{display:inline-flex;align-items:center;gap:10px;padding:14px 22px;border-radius:14px;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none;border:1px solid transparent;transition:transform .2s,box-shadow .2s;}
        .kx-btn img{width:22px;height:22px;}
        .kx-btn-label{display:flex;flex-direction:column;line-height:1.15;text-align:left;}
        .kx-btn-label small{font-weight:400;font-size:11px;opacity:.8;}
        .kx-btn-label small .size-highlight{font-size:13px;font-weight:inherit;color:inherit;text-decoration:underline;-webkit-text-stroke:none;}
        .kx-hud-row .size-highlight{font-size:1.3em;font-weight:800;color:#fff;-webkit-text-stroke:0.8px #1565C0;}
        .kx-btn-primary{background:linear-gradient(135deg,#fff,#e6f2ff);color:var(--kx-blue);box-shadow:0 10px 30px rgba(56,189,248,.35);position:relative;overflow:hidden;}
        .kx-btn-primary img{filter:none;}
        .kx-btn-primary::after{content:"";position:absolute;top:0;left:-60%;width:40%;height:100%;
            background:linear-gradient(120deg,transparent,rgba(21,101,216,.25),transparent);transform:skewX(-20deg);
            animation:btn-shine 3.5s ease-in-out infinite;pointer-events:none;}
        .kx-btn-ghost{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.35);}
        .kx-btn-ghost img{filter:brightness(0) invert(1);}
        .kx-btn:hover{transform:translateY(-2px);}
        .kx-tags{list-style:none;display:flex;gap:8px;flex-wrap:wrap;padding:0;margin:6px 0 0;}
        .kx-tags li{font-size:12px;color:#dbeeff;padding:5px 10px;border:1px solid rgba(255,255,255,.22);border-radius:999px;background:rgba(255,255,255,.06);}

        .kx-hud{background:rgba(8,20,48,.55);backdrop-filter:blur(10px);border:1px solid rgba(56,189,248,.35);border-radius:20px;padding:20px;
            box-shadow:0 0 0 1px rgba(56,189,248,.12),0 20px 50px rgba(0,0,0,.35);}
        .kx-hud-head{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.12em;color:#7dd3fc;display:flex;align-items:center;gap:8px;margin-bottom:14px;}
        .kx-hud-dot{width:8px;height:8px;border-radius:50%;background:#38bdf8;box-shadow:0 0 10px #38bdf8;animation:kx-pulse 1.8s infinite;}
        .kx-qr{position:relative;display:flex;justify-content:center;padding:14px;background:#fff;border-radius:14px;margin-bottom:14px;flex-wrap:wrap;}
        .kx-qr-card{width:140px;}
        .kx-qr-card img{width:100%;display:block;}
        .kx-qr-ph{width:140px;height:140px;display:flex;align-items:center;justify-content:center;background:#0a1f4d;color:#7dd3fc;font-family:'JetBrains Mono',monospace;border-radius:10px;}
        .kx-qr-cap{display:block;width:100%;text-align:center;font-size:12px;color:#bfe3ff;margin-top:6px;}
        .kx-hud-row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-top:1px dashed rgba(125,211,252,.2);font-size:13px;color:#cfe6ff;}
        .kx-hud-row span{color:#8fb6e6;}
        .kx-hud-row b{font-family:'JetBrains Mono',monospace;color:#fff;}

        .kx-section{max-width:1200px;margin:64px auto 0;padding:0 24px;}
        .kx-section-alt{margin-top:72px;}
        .kx-section-head{text-align:center;margin-bottom:34px;}
        .kx-section-head .kx-eyebrow{color:var(--kx-blue);border-color:var(--kx-line);background:rgba(21,101,216,.06);}
        .kx-section-head h2{font-size:clamp(24px,3.2vw,36px);font-weight:800;margin:14px 0 8px;color:var(--kx-ink);}
        .kx-section-head h2 em{font-style:normal;background:linear-gradient(90deg,var(--kx-blue),var(--kx-cyan));-webkit-background-clip:text;background-clip:text;color:transparent;}
        .kx-section-desc{color:var(--kx-muted);font-size:15px;max-width:640px;margin:0 auto;}

        .kx-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
        .kx-card{position:relative;background:rgba(255,255,255,.7);backdrop-filter:blur(8px);border:1px solid var(--kx-line);border-radius:18px;padding:26px 24px 24px;overflow:hidden;transition:transform .25s,box-shadow .25s,border-color .25s;}
        .kx-card::before{content:"";position:absolute;inset:0;border-radius:18px;padding:1px;background:linear-gradient(135deg,rgba(56,189,248,.5),transparent 50%);
            -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .25s;}
        .kx-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(21,101,216,.16);border-color:rgba(56,189,248,.5);}
        .kx-card:hover::before{opacity:1;}
        .kx-card-idx{position:absolute;top:14px;right:18px;font-family:'JetBrains Mono',monospace;font-size:30px;font-weight:700;color:rgba(21,101,216,.12);}
        .kx-card-ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(21,101,216,.12),rgba(56,189,248,.12));color:var(--kx-blue);margin-bottom:14px;}
        .kx-card-ico svg{width:24px;height:24px;}
        .kx-card h3{font-size:18px;margin:0 0 8px;color:var(--kx-ink);}
        .kx-card p{font-size:14px;color:var(--kx-muted);margin:0 0 12px;line-height:1.7;}
        .kx-card ul,.kx-card ol{margin:0;padding-left:18px;color:var(--kx-muted);font-size:13.5px;line-height:1.9;}

        .kx-features{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
        .kx-feature{position:relative;display:flex;gap:16px;align-items:flex-start;background:rgba(255,255,255,.7);backdrop-filter:blur(8px);border:1px solid var(--kx-line);border-radius:18px;padding:22px;transition:transform .25s,box-shadow .25s,border-color .25s;}
        .kx-feature:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(21,101,216,.16);border-color:rgba(56,189,248,.5);}
        .kx-feature-idx{font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--kx-cyan);position:absolute;top:14px;right:16px;}
        .kx-feature-ico{width:48px;height:48px;flex:0 0 48px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--kx-blue),var(--kx-cyan));color:#fff;box-shadow:0 8px 20px rgba(21,101,216,.35);}
        .kx-feature-ico svg{width:24px;height:24px;}
        .kx-feature h4{margin:0 0 6px;font-size:17px;color:var(--kx-ink);}
        .kx-feature p{margin:0;font-size:14px;color:var(--kx-muted);line-height:1.7;}

        .kx-m-hero{text-align:center;padding:0 20px 10px;}
        .kx-m-hero .kx-eyebrow{margin-bottom:14px;}
        .kx-m-hero h1{font-size:30px;font-weight:800;margin:10px 0;color:var(--kx-ink);}
        .kx-m-hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--kx-blue),var(--kx-cyan));-webkit-background-clip:text;background-clip:text;color:transparent;}
        .kx-m-hero p{font-size:14px;color:var(--kx-muted);margin:0 auto 18px;max-width:340px;}
        .kx-m-cta{display:flex;flex-direction:column;gap:10px;max-width:300px;margin:0 auto;}
        .kx-m-qr{width:150px;margin:18px auto 0;background:#fff;padding:12px;border-radius:14px;box-shadow:0 8px 24px rgba(21,101,216,.12);}
        .kx-m-qr img{width:100%;display:block;}
        .kx-m-qr span{display:block;text-align:center;font-size:12px;color:var(--kx-muted);margin-top:8px;}
        .kx-m-section{max-width:560px;margin:34px auto 0;padding:0 18px;}
        .kx-m-section h2{font-size:20px;color:var(--kx-ink);margin:0 0 10px;}
        .kx-m-section p{font-size:14px;color:var(--kx-muted);margin:0 0 10px;}
        .kx-m-section ul,.kx-m-section ol{padding-left:20px;color:var(--kx-muted);font-size:14px;line-height:1.9;margin:0;}
        .kx-m-features{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:560px;margin:30px auto 0;padding:0 18px;}
        .kx-m-feature{background:rgba(255,255,255,.7);border:1px solid var(--kx-line);border-radius:14px;padding:16px;}
        .kx-m-feature .kx-feature-ico{margin-bottom:10px;}
        .kx-m-feature h4{margin:0 0 4px;font-size:15px;color:var(--kx-ink);}
        .kx-m-feature p{margin:0;font-size:13px;color:var(--kx-muted);}

        @media (max-width:900px){
            .kx-hero-inner{grid-template-columns:1fr;}
            .kx-cards{grid-template-columns:1fr;}
            .kx-features{grid-template-columns:1fr;}
        }
        @media (max-width:768px){
            .kx-hero{border-radius:0;padding:40px 20px;}
            .kx-m-features{grid-template-columns:1fr;}
        }
    

        /* ===== 移动端下载页 · 浅色科技感（与站点蓝色调统一 #1976D2 / #4285F4） ===== */
        .mobile-download-container {
            --m-blue: #1976D2;
            --m-blue2: #4285F4;
            --m-ink: #1f2a37;
            --m-muted: #5b6b7b;
            --m-line: rgba(25,118,210,.16);
            background: linear-gradient(180deg, #eaf2ff 0%, #f6faff 50%, #FFFFFF 100%);
            min-height: 100vh;
        }
        .mobile-download-container .mobile-hero {
            background: linear-gradient(135deg, #dbe9ff 0%, #eaf3ff 55%, #FFFFFF 100%);
            color: var(--m-ink);
            border-radius: 0 0 26px 26px;
            position: relative;
            overflow: hidden;
            padding: 46px 22px 30px;
        }
        .mobile-download-container .mobile-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            opacity: .55;
            background-image:
                linear-gradient(rgba(25,118,210,.10) 1px, transparent 1px),
                linear-gradient(90deg, rgba(25,118,210,.10) 1px, transparent 1px);
            background-size: 26px 26px;
            -webkit-mask-image: radial-gradient(circle at 50% 0%, #000, transparent 78%);
            mask-image: radial-gradient(circle at 50% 0%, #000, transparent 78%);
        }
        .mobile-download-container .mobile-hero > * { position: relative; z-index: 2; }
        .mobile-download-container .kx-eyebrow {
            display: inline-block;
            font-family: 'JetBrains Mono', monospace;
            font-size: 11px;
            letter-spacing: .18em;
            text-transform: uppercase;
            color: var(--m-blue);
            padding: 5px 12px;
            border: 1px solid var(--m-line);
            border-radius: 999px;
            background: rgba(25,118,210,.06);
        }
        .mobile-download-container .kx-m-hero h1 {
            font-size: 30px;
            font-weight: 800;
            margin: 12px 0 8px;
            color: var(--m-ink);
            line-height: 1.25;
        }
        .mobile-download-container .kx-m-hero h1 em {
            font-style: normal;
            background: linear-gradient(90deg, var(--m-blue), var(--m-blue2));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .mobile-download-container .kx-m-hero p {
            font-size: 14px;
            color: var(--m-muted);
            margin: 0 auto 20px;
            max-width: 340px;
        }
        .mobile-download-container .kx-m-intro {
            font-size: 14px;
            line-height: 1.75;
            color: var(--m-ink);
            background: rgba(25,118,210,.06);
            border: 1px solid var(--m-line);
            border-radius: 14px;
            padding: 14px 16px;
            margin: 0 auto 22px;
            max-width: 360px;
            text-align: left;
        }
        .mobile-download-container .kx-m-cta {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 320px;
            margin: 0 auto;
        }
        .mobile-download-container .kx-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 15px 22px;
            border-radius: 14px;
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            border: 1px solid transparent;
        }
        .mobile-download-container .kx-btn img { width: 22px; height: 22px; }
        .mobile-download-container .kx-btn-label {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
            text-align: left;
        }
        .mobile-download-container .kx-btn-label small { font-weight: 400; font-size: 11px; opacity: .85; }
        .mobile-download-container .kx-btn-label small .size-highlight {
            font-size: 13px;
            font-weight: inherit;
            color: inherit;
            text-decoration: underline;
            -webkit-text-stroke: none;
        }
        .mobile-download-container .kx-btn-primary {
            background: linear-gradient(135deg, var(--m-blue), var(--m-blue2));
            color: #fff;
            box-shadow: 0 12px 26px rgba(25,118,210,.30);
        }
        .mobile-download-container .kx-btn-primary img { filter: brightness(0) invert(1); }
        .mobile-download-container .kx-btn-ghost {
            background: #fff;
            color: var(--m-blue);
            border-color: var(--m-line);
            box-shadow: 0 8px 20px rgba(25,118,210,.12);
        }
        .mobile-download-container .kx-btn-ghost img { filter: none; }
        .mobile-download-container .kx-m-qr {
            width: 162px;
            margin: 20px auto 0;
            background: #fff;
            padding: 14px;
            border-radius: 16px;
            box-shadow: 0 10px 28px rgba(25,118,210,.14);
            border: 1px solid var(--m-line);
        }
        .mobile-download-container .kx-m-qr img { width: 100%; display: block; }
        .mobile-download-container .kx-m-qr span {
            display: block;
            text-align: center;
            font-size: 12px;
            color: var(--m-muted);
            margin-top: 8px;
        }
        .mobile-download-container .kx-m-section,
        .mobile-download-container .kx-section {
            max-width: 560px;
            margin: 30px auto 0;
            padding: 0 18px;
        }
        .mobile-download-container .kx-section-head { text-align: center; margin-bottom: 24px; }
        .mobile-download-container .kx-section-head .kx-eyebrow { color: var(--m-blue); border-color: var(--m-line); background: rgba(25,118,210,.06); }
        .mobile-download-container .kx-section-head h2 {
            font-size: 22px;
            color: var(--m-ink);
            margin: 12px 0 8px;
            font-weight: 800;
        }
        .mobile-download-container .kx-section-head h2 em {
            font-style: normal;
            background: linear-gradient(90deg, var(--m-blue), var(--m-blue2));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .mobile-download-container .kx-section-desc {
            color: var(--m-muted);
            font-size: 14px;
            max-width: 420px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .mobile-download-container .kx-m-section h2 {
            font-size: 19px;
            color: var(--m-ink);
            margin: 0 0 10px;
            font-weight: 700;
        }
        .mobile-download-container .kx-m-section p {
            font-size: 14px;
            color: var(--m-muted);
            margin: 0 0 10px;
            line-height: 1.7;
        }
        .mobile-download-container .kx-m-section ul,
        .mobile-download-container .kx-m-section ol {
            padding-left: 20px;
            color: var(--m-muted);
            font-size: 14px;
            line-height: 1.9;
            margin: 0;
        }
        .mobile-download-container .kx-m-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            max-width: 560px;
            margin: 26px auto 0;
            padding: 0 18px;
        }
        .mobile-download-container .kx-m-feature {
            background: #fff;
            border: 1px solid var(--m-line);
            border-radius: 16px;
            padding: 18px;
            box-shadow: 0 8px 22px rgba(25,118,210,.08);
        }
        .mobile-download-container .kx-feature-ico {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--m-blue), var(--m-blue2));
            color: #fff;
            box-shadow: 0 8px 18px rgba(25,118,210,.30);
            margin-bottom: 12px;
        }
        .mobile-download-container .kx-feature-ico svg { width: 22px; height: 22px; }
        .mobile-download-container .kx-m-feature h4 {
            margin: 0 0 6px;
            font-size: 15px;
            color: var(--m-ink);
            font-weight: 700;
        }
        .mobile-download-container .kx-m-feature p {
            margin: 0;
            font-size: 13px;
            color: var(--m-muted);
            line-height: 1.6;
        }
        @media (max-width: 380px) {
            .mobile-download-container .kx-m-features { grid-template-columns: 1fr; }
        }

        /* 强制仅渲染移动端下载布局（无独立桌面版）；桌面预览也能正常查看本页 */
        .desktop-content { display: none !important; }
        .mobile-content { display: block !important; width: 100%; }

        /* ===== 移动端深色模式：中性灰黑主色调（参考 quick-start.html，2026-08-17） ===== */
        @media (prefers-color-scheme: dark) and (max-width: 768px) {
            /* 字体/边框颜色 SSOT（参考 index 深色：主文#FFFFFF / 次文#E5E7EB / 弱化#9CA3AF / 品牌浅蓝#6BA5F7）
               关键修复：原本写在 :root（特异性 0,0,1），被浅色 .mobile-download-container（0,1,0）的同名定义压制，
               导致深色模式标题/正文仍是深蓝 #1f2a37 / #5b6b7b，黑底上看不清。
               改为在 .mobile-download-container（同特异性、媒体块靠后）定义并加 !important，确保深色值生效。 */
            .mobile-download-container {
                --m-blue: #6BA5F7 !important;
                --m-blue2: #8FB8F9 !important;
                --m-ink: #FFFFFF !important;
                --m-muted: #E5E7EB !important;
                --m-line: rgba(255, 255, 255, 0.12) !important;
                /* 防御性：一并覆盖 kx-* 变量，避免个别元素残留深蓝 */
                --kx-ink: #FFFFFF !important;
                --kx-muted: #E5E7EB !important;
                --kx-blue: #6BA5F7 !important;
                --kx-cyan: #8FD3F4 !important;
                --kx-line: rgba(255, 255, 255, 0.12) !important;
            }
            html, body { background: #121212 !important; }
            .mobile-download-container {
                background: #121212 !important;
                color: #E5E7EB !important;
            }
            .mobile-download-container .kx-m-hero { color: #FFFFFF !important; }
            .mobile-download-container .kx-m-intro {
                background: rgba(255, 255, 255, 0.06) !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                color: #E5E7EB !important;
            }
            .mobile-download-container .kx-btn-primary {
                color: #0B1220 !important;
                box-shadow: 0 12px 26px rgba(107, 165, 247, 0.30) !important;
            }
            .mobile-download-container .kx-btn-primary img { filter: brightness(0) !important; }
            .mobile-download-container .kx-btn-ghost {
                background: #1E1E1E !important;
                color: var(--m-blue) !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                box-shadow: 0 8px 20px rgba(0, 0, 0, 0.30) !important;
            }
            .mobile-download-container .kx-btn-ghost img { filter: none !important; }
            .mobile-download-container .kx-m-qr {
                background: #1E1E1E !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
            }
            .mobile-download-container .kx-m-qr span { color: #9CA3AF !important; }
            .mobile-download-container .kx-m-feature {
                background: #1E1E1E !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35) !important;
            }
            .mobile-download-container .kx-m-feature h4 { color: #FFFFFF !important; }
            .mobile-download-container .kx-m-feature p { color: #E5E7EB !important; }

            /* 隐私区域深色化：移动版 <section class="kx-section"> 位于 .mobile-content 内、
               但不在 .mobile-download-container 内（其 div 在第 289 行已闭合），
               故上一轮用 .mobile-download-container 前缀的规则对它完全不生效——
               eyebrow 回退到浅色 var(--kx-blue) 深蓝、h2 回退到 var(--kx-ink) 近黑，黑底看不清。
               此处改用 .mobile-content .kx-section 作用域单独覆盖（仅移动端深色生效）。 */
            .mobile-content .kx-section .kx-section-head .kx-eyebrow {
                background: rgba(255, 255, 255, 0.08) !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                color: #E5E7EB !important;
            }
            .mobile-content .kx-section .kx-section-head h2 { color: #E5E7EB !important; }
            .mobile-content .kx-section .kx-section-desc { color: #E5E7EB !important; }
            /* 隐私特性卡片同步深色底，避免暗页上出现白块 */
            .mobile-content .kx-section .kx-m-feature {
                background: #1E1E1E !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35) !important;
            }
            .mobile-content .kx-section .kx-m-feature h4 { color: #FFFFFF !important; }
            .mobile-content .kx-section .kx-m-feature p { color: #E5E7EB !important; }
            .mobile-download-container .kx-feature {
                background: #1E1E1E !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35) !important;
            }
            .mobile-download-container .kx-feature:hover {
                border-color: rgba(107, 165, 247, 0.5) !important;
                box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45) !important;
            }
            .mobile-download-container .kx-feature-idx { color: #6BA5F7 !important; }
            .mobile-download-container .kx-feature h4 { color: #FFFFFF !important; }
            .mobile-download-container .kx-feature p { color: #E5E7EB !important; }

            /* 三步到位卡片（.kx-card）同步深色化，避免同页出现浅灰卡片 */
            .mobile-download-container .kx-card {
                background: #1E1E1E !important;
                border-color: rgba(255, 255, 255, 0.12) !important;
                box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35) !important;
            }
            .mobile-download-container .kx-card:hover {
                border-color: rgba(107, 165, 247, 0.5) !important;
                box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45) !important;
            }
            .mobile-download-container .kx-card::before {
                background: linear-gradient(135deg, rgba(107, 165, 247, 0.5), transparent 50%) !important;
            }
            .mobile-download-container .kx-card-idx { color: rgba(107, 165, 247, 0.22) !important; }
            .mobile-download-container .kx-card-ico {
                background: linear-gradient(135deg, rgba(107, 165, 247, 0.18), rgba(143, 211, 244, 0.18)) !important;
                color: #6BA5F7 !important;
            }
            .mobile-download-container .kx-card h3 { color: #FFFFFF !important; }
            .mobile-download-container .kx-card p,
            .mobile-download-container .kx-card ul,
            .mobile-download-container .kx-card ol { color: #E5E7EB !important; }

            .site-footer {
                background: #121212 !important;
                color: #9CA3AF !important;
            }
            .site-footer a { color: #C7CDD6 !important; }
        }