/* 由 ks100\use-cases.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。 */


        /* 修复页眉菜单上方空白：让 .ks100-nav 内 a 的 line-height 与 header 高度保持一致 */
        .ks100-nav a {
            line-height: 56px !important;
        }

        /* ===== 移动端全局 ===== */
        @media (max-width: 768px) {
            html, body { margin: 0; padding: 0; background: #F3F8FF; }
            body > header {
                position: relative;
                z-index: var(--z-toast);
                display: block !important;
                height: 64px !important;
                margin: 0 !important;
                padding: 0 !important;
                align-items: center;
            }
            body > main { margin: 0; padding: 0; }
            body > main > * { margin: 0; padding: 0; }
            .mobile-content {
                display: block;
                width: 100%;
                margin: 0;
                padding: 0;
                background: #FFFFFF;
            }
            .mobile-content > * {
                margin-top: 0;
                margin-bottom: 0;
            }
        }

        /* ===== 桌面端 ===== */
        @media (min-width: 769px) {
            body {
                margin: 0 !important;
                padding: 0 !important;
                background: var(--bg-page-gradient);
            }

            body > header {
                position: relative;
                z-index: var(--z-toast);
                height: 64px !important;
                margin-bottom: 0 !important;
                box-shadow: 0 1px 0 rgba(0,0,0,0.06) !important;
                padding: 0 !important;
                backdrop-filter: saturate(180%) blur(20px);
                background: rgba(255,255,255,0.85) !important;
            }

            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: #1976D2;
            }

            /* 桌面端隐藏移动端全屏预览层 */
            .uc-fullscreen-overlay { display: none !important; }

            /* ===== 桌面端 Hero ===== */
            .desktop-hero {
                position: relative;
                padding: 80px 60px 70px;
                background: transparent;
                overflow: hidden;
            }
            .desktop-hero::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;
            }
            .desktop-hero::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;
            }
            .desktop-hero-inner {
                max-width: 1400px;
                margin: 0 auto;
                position: relative;
                z-index: var(--z-content);
            }
            .desktop-hero-eyebrow {
                display: inline-block;
                font-size: 13px;
                font-weight: 700;
                letter-spacing: 4px;
                color: #1976D2;
                margin-bottom: 18px;
                text-transform: uppercase;
            }
            .desktop-hero h1 {
                font-size: clamp(40px, 5vw, 56px);
                font-weight: 800;
                color: #454F5E;
                margin: 0 0 18px;
                line-height: 1.15;
                letter-spacing: -1px;
                max-width: 720px;
            }
            .desktop-hero h1 .accent {
                background: linear-gradient(135deg, #1976D2 0%, #4285F4 100%);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
            }
            .desktop-hero p {
                font-size: 17px;
                color: #556675;
                line-height: 1.75;
                margin: 0;
                max-width: 600px;
            }
            .desktop-hero-stats {
                display: flex;
                gap: 48px;
                margin-top: 36px;
            }
            .desktop-hero-stat {
                display: flex;
                flex-direction: column;
            }
            .desktop-hero-stat-num {
                font-size: 32px;
                font-weight: 800;
                color: #454F5E;
                line-height: 1;
                margin-bottom: 6px;
            }
            .desktop-hero-stat-label {
                font-size: 13px;
                color: #7A8A99;
                font-weight: 500;
            }

            /* ===== 桌面端六大场景卡片 ===== */
            .desktop-scenarios {
                padding: 60px 60px 20px;
                background: transparent;
            }
            .desktop-scenarios-inner {
                max-width: 1600px;
                margin: 0 auto;
            }
            .desktop-scenarios-header {
                position: relative;
                z-index: var(--z-toast);
                text-align: center;
                margin-bottom: 40px;
            }

            .desktop-scenarios-header .eyebrow {
                display: inline-block;
                font-size: 12px;
                font-weight: 700;
                letter-spacing: 3px;
                color: #9AA6B2;
                margin-bottom: 10px;
                text-transform: uppercase;
            }
            .desktop-scenarios-header h2 {
                font-size: 36px;
                font-weight: 800;
                color: #454F5E;
                margin: 0 0 10px;
                letter-spacing: -0.5px;
            }
            .desktop-scenarios-header p {
                font-size: 15px;
                color: #7A8A99;
                margin: 0;
            }

            .desktop-card-grid {
                display: flex;
                flex-wrap: nowrap;
                gap: 20px;
                margin: -16px;
                /* 桌面端：独立水平滚动区，竖向滚轮 → 横向移动，与页面竖向滚动解耦 */
                overflow-x: auto;
                overflow-y: hidden;
                scroll-snap-type: none;       /* 关闭吸附，交给 JS 缓动 lerp 控制 */
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;       /* Firefox：隐藏滚动条（功能保留） */
                -ms-overflow-style: none;    /* 旧 Edge：隐藏滚动条 */
                padding: 16px;
                /* Xbox360 风格 3D 透视容器 */
                perspective: 1400px;
                transform-style: preserve-3d;
            }
            /* 隐藏 WebKit 滚动条：视觉不显示，但 scrollLeft 仍可程序/滚轮驱动 */
            .desktop-card-grid::-webkit-scrollbar {
                width: 0;
                height: 0;
                display: none;
            }
            .desktop-scenario-card {
                flex: 0 0 auto;
                width: 320px;
                background: #FAFBFD;
                border-radius: 18px;
                padding: 28px 26px 26px;
                cursor: pointer;
                transition: transform 0.5s cubic-bezier(0.22, 0.61, 0.36, 1), opacity 0.5s ease, box-shadow 0.5s ease;
                position: relative;
                text-align: left;
                border: 1px solid transparent;
                overflow: hidden;
                transform-style: preserve-3d;
                backface-visibility: hidden;
                transform-origin: center center;
                opacity: 0.78;                /* 未选中：仅半透明，模糊效果已取消 */
                transform: scale(0.97);
            }
            /* 切换聚焦拉焦动效：入场由强模糊+略倾斜平滑过渡为清晰正面（动态模糊） */
            @keyframes ucTiltIn {
                from { transform: rotateY(-14deg) scale(0.94); opacity: 0.82; }
                to   { transform: translateY(-4px) scale(1.04); opacity: 1; }
            }
            .desktop-scenario-card::before {
                content: "";
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 3px;
                background: linear-gradient(90deg, #1976D2, #4285F4);
                transform: scaleX(0);
                transform-origin: left;
                transition: transform 0.4s ease;
            }
            .desktop-scenario-card:hover {
                transform: translateY(-4px);
                background: #FFFFFF;
                box-shadow: 0 16px 40px rgba(25, 118, 210, 0.12);
                border-color: rgba(25, 118, 210, 0.15);
            }
            .desktop-scenario-card:hover::before {
                transform: scaleX(1);
            }
            .desktop-scenario-card.active {
                background: linear-gradient(135deg, #1976D2 0%, #1565C0 100%);
                box-shadow: 0 20px 50px rgba(25, 118, 210, 0.3);
                border-color: transparent;
                opacity: 1;
                transform: translateY(-4px) scale(1.04);
                z-index: 3;
                animation: ucTiltIn 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
            }
            .desktop-scenario-card.active::before {
                transform: scaleX(1);
                background: rgba(255,255,255,0.5);
            }
            .desktop-card-top {
                display: flex;
                justify-content: space-between;
                align-items: center;
                margin-bottom: 18px;
            }
            .desktop-card-icon {
                width: 52px;
                height: 52px;
                margin-bottom: 0;
                background: #FFFFFF;
                border-radius: 14px;
                display: flex;
                align-items: center;
                justify-content: center;
                box-shadow: 0 4px 12px rgba(25, 118, 210, 0.1);
                font-size: 24px;
                transition: all 0.3s ease;
            }
            .desktop-scenario-card:hover .desktop-card-icon {
                transform: scale(1.08) rotate(-3deg);
                box-shadow: 0 6px 18px rgba(25, 118, 210, 0.18);
            }
            .desktop-scenario-card.active .desktop-card-icon {
                background: rgba(255,255,255,0.2);
                box-shadow: 0 4px 14px rgba(0,0,0,0.15);
            }
            .desktop-card-num {
                font-size: 11px;
                color: #1976D2;
                font-weight: 700;
                letter-spacing: 2px;
                margin-bottom: 8px;
            }
            .desktop-scenario-card.active .desktop-card-num {
                color: rgba(255,255,255,0.7);
            }
            .desktop-card-title {
                font-size: 22px;
                font-weight: 700;
                color: #454F5E;
                margin: 0 0 8px;
                letter-spacing: -0.3px;
            }
            .desktop-scenario-card.active .desktop-card-title {
                color: #FFFFFF;
            }
            .desktop-card-desc {
                font-size: 14px;
                color: #6B7A89;
                line-height: 1.6;
                margin: 0 0 18px;
            }
            .desktop-scenario-card.active .desktop-card-desc {
                color: rgba(255,255,255,0.85);
            }
            .desktop-card-arrow {
                display: inline-flex;
                align-items: center;
                gap: 6px;
                font-size: 13px;
                font-weight: 600;
                color: #1976D2;
                transition: gap 0.3s ease;
            }
            .desktop-scenario-card:hover .desktop-card-arrow {
                gap: 10px;
            }
            .desktop-scenario-card.active .desktop-card-arrow {
                color: #FFFFFF;
            }
            .desktop-card-arrow-icon {
                width: 28px;
                height: 28px;
                border-radius: 50%;
                background: #EBF3FF;
                display: flex;
                align-items: center;
                justify-content: center;
                transition: all 0.3s ease;
            }
            .desktop-scenario-card.active .desktop-card-arrow-icon {
                background: rgba(255,255,255,0.25);
            }

            /* ===== 桌面端详情展示区 ===== */
            .desktop-showcase {
                padding: 40px 60px 80px;
                background: transparent;
            }
            .desktop-showcase-inner {
                max-width: 1600px;
                margin: 0 auto;
            }
            .desktop-showcase-section {
                display: none;
                animation: showcaseFadeIn 0.5s ease;
            }
            .desktop-showcase-section.active {
                display: block;
            }
            @keyframes showcaseFadeIn {
                from { opacity: 0; transform: translateY(16px); }
                to { opacity: 1; transform: translateY(0); }
            }
            .desktop-showcase-layout {
                display: grid;
                grid-template-columns: 360px 1fr;
                gap: 60px;
                align-items: start;
            }
            .desktop-showcase-text {
                position: sticky;
                top: 96px;
            }
            .desktop-showcase-num {
                display: inline-block;
                font-size: 12px;
                font-weight: 700;
                letter-spacing: 2px;
                color: #1976D2;
                margin-bottom: 12px;
            }
            .desktop-showcase-title {
                font-size: 36px;
                font-weight: 800;
                color: #454F5E;
                margin: 0 0 16px;
                line-height: 1.2;
                letter-spacing: -0.5px;
            }
            .desktop-showcase-subtitle {
                font-size: 18px;
                color: #334155;
                font-weight: 600;
                margin: 0 0 14px;
            }
            .desktop-showcase-desc {
                font-size: 15px;
                color: #556675;
                line-height: 1.75;
                margin: 0 0 24px;
            }
            .desktop-showcase-features {
                list-style: none;
                padding: 0;
                margin: 0 0 28px;
            }
            .desktop-showcase-features li {
                display: flex;
                align-items: flex-start;
                gap: 10px;
                padding: 10px 0;
                font-size: 14px;
                color: #334155;
                border-bottom: 1px solid #E2E8F0;
                font-weight: 500;
            }
            .desktop-showcase-features li:last-child {
                border-bottom: none;
            }
            .desktop-showcase-features li::before {
                content: "✓";
                flex-shrink: 0;
                width: 22px;
                height: 22px;
                background: linear-gradient(135deg, #1976D2, #4285F4);
                color: #fff;
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                font-size: 12px;
                font-weight: 700;
                margin-top: 1px;
            }
            .desktop-showcase-tags {
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
            }
            .desktop-showcase-tag {
                font-size: 12px;
                font-weight: 600;
                color: #1976D2;
                background: #EBF3FF;
                padding: 7px 14px;
                border-radius: 999px;
            }

            .desktop-showcase-carousel-wrap {
                position: relative;
            }
            .desktop-carousel-frame {
                position: relative;
                border-radius: 20px;
                overflow: hidden;
                box-shadow: 0 30px 80px rgba(26, 35, 126, 0.18), 0 8px 24px rgba(26, 35, 126, 0.08);
                background: #FFFFFF;
                aspect-ratio: 16 / 10;
                max-height: 1081px;
                width: 100%;
                contain: layout size;
            }
            .desktop-carousel-inner {
                display: flex;
                width: 100%;
                height: 100%;
                padding-top: 36px;
                box-sizing: border-box;
            }
            .desktop-carousel-img-col {
                flex: 0 0 60%;
                height: 100%;
                background: #f8fafc;
                position: relative;
                overflow: hidden;
            }
            .desktop-carousel-tutorial-col {
                flex: 0 0 40%;
                height: 100%;
                background: #FFFFFF;
                border-left: 1px solid #E8ECF1;
                display: flex;
                flex-direction: column;
                box-sizing: border-box;
            }
            .desktop-tutorial-display {
                flex: 0 0 80%;
                padding: 32px 36px;
                box-sizing: border-box;
                overflow: hidden;
                position: relative;
            }
            .desktop-tutorial-item {
                position: absolute;
                top: 32px;
                left: 36px;
                width: calc(100% - 72px);
                padding: 34px 36px;
                background: #FFFFFF;
                border-radius: 19px;
                border: 2px solid #1976D2;
                box-shadow: 0 8px 28px rgba(25, 118, 210, 0.15);
                box-sizing: border-box;
            }
            .desktop-tutorial-item .tutorial-num,
            .desktop-tutorial-item .tutorial-title,
            .desktop-tutorial-item .tutorial-desc {
                transition: opacity 0.25s ease;
            }
            .desktop-tutorial-item .tutorial-num {
                font-size: 12px;
                font-weight: 700;
                color: #1976D2;
                letter-spacing: 2.5px;
                margin-bottom: 12px;
            }
            .desktop-tutorial-item .tutorial-title {
                font-size: 20px;
                font-weight: 700;
                color: #454F5E;
                margin: 0 0 12px;
            }
            .desktop-tutorial-item .tutorial-desc {
                font-size: 15px;
                color: #556675;
                line-height: 1.7;
                margin: 0;
            }
            .desktop-tutorial-actions {
                flex: 0 0 20%;
                display: flex;
                align-items: center;
                justify-content: center;
                gap: 24px;
                padding: 20px 36px;
                box-sizing: border-box;
                border-top: 1px solid #E8ECF1;
                background: #FAFBFC;
                position: relative;
            }
            .desktop-tutorial-action-btn {
                width: 52px;
                height: 52px;
                flex-shrink: 0;
                background: #FFFFFF;
                color: #454F5E;
                border: 1px solid #E2E8F0;
                border-radius: 50%;
                font-size: 22px;
                cursor: pointer;
                box-shadow: 0 2px 8px rgba(0,0,0,0.06);
                display: flex;
                align-items: center;
                justify-content: center;
                transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
                position: relative;
            }
            .desktop-tutorial-action-btn:hover {
                background: #1976D2;
                color: #FFFFFF;
                border-color: #1976D2;
                box-shadow: 0 6px 18px rgba(25, 118, 210, 0.3);
            }
            .desktop-tutorial-action-btn.disabled,
            .desktop-tutorial-action-btn.disabled:hover {
                color: #B0BEC5;
                border-color: #E2E8F0;
                background: #F4F6F8;
                box-shadow: none;
                cursor: not-allowed;
            }
            .desktop-tutorial-step-indicator {
                font-size: 14px;
                color: #94A3B8;
                font-weight: 500;
                min-width: 50px;
                text-align: center;
            }
            .desktop-tutorial-step-indicator span {
                color: #1976D2;
                font-weight: 700;
                font-size: 16px;
            }
            
            /* 边界提示文字动画 - 烟雾漂浮效果 */
            .tutorial-boundary-tip {
                position: absolute;
                font-size: 12px;
                color: #1976D2;
                background: rgba(25, 118, 210, 0.1);
                padding: 4px 10px;
                border-radius: 12px;
                white-space: nowrap;
                opacity: 0;
                pointer-events: none;
                z-index: var(--z-card);
                left: 50%;
                transform: translateX(-50%);
            }
            .tutorial-boundary-tip.to-top {
                bottom: calc(100% + 30px);
                animation: smokeFloatUp 1.2s ease-out forwards;
            }
            .tutorial-boundary-tip.to-bottom {
                bottom: calc(100% + 30px);
                animation: smokeFloatUpDown 1.2s ease-out forwards;
            }
            @keyframes smokeFloatUp {
                0% {
                    opacity: 0;
                    transform: translateX(-50%) translateY(10px) scale(0.8);
                }
                20% {
                    opacity: 1;
                    transform: translateX(-50%) translateY(0) scale(1);
                }
                70% {
                    opacity: 1;
                    transform: translateX(-50%) translateY(-20px) scale(1);
                }
                100% {
                    opacity: 0;
                    transform: translateX(-50%) translateY(-30px) scale(0.9);
                }
            }
            @keyframes smokeFloatUpDown {
                0% {
                    opacity: 0;
                    transform: translateX(-50%) translateY(-10px) scale(0.8);
                }
                20% {
                    opacity: 1;
                    transform: translateX(-50%) translateY(0) scale(1);
                }
                70% {
                    opacity: 1;
                    transform: translateX(-50%) translateY(20px) scale(1);
                }
                100% {
                    opacity: 0;
                    transform: translateX(-50%) translateY(30px) scale(0.9);
                }
            }
            .desktop-carousel-frame::before {
                content: "";
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 36px;
                background: linear-gradient(180deg, #F5F5F7, #ECECEE);
                z-index: var(--z-content-high);
                border-bottom: 1px solid #DCDCE0;
            }
            .desktop-carousel-dots {
                position: absolute;
                top: 12px;
                left: 14px;
                display: flex;
                gap: 8px;
                z-index: var(--z-content-overlay);
            }
            .desktop-carousel-dot {
                width: 12px;
                height: 12px;
                border-radius: 50%;
                background: #D0D0D5;
            }
            .desktop-carousel-dot.red { background: #FF5F56; }
            .desktop-carousel-dot.yellow { background: #FFBD2E; }
            .desktop-carousel-dot.green { background: #27C93F; }

            /* 圆形切换按钮（图文/视频）—— 独立定位右上角 */
            .desktop-carousel-view-toggle {
                position: absolute;
                top: 9px;
                right: 14px;
                width: 20px;
                height: 20px;
                border-radius: 50%;
                background: #FFFFFF;
                border: 1px solid rgba(0,0,0,0.12);
                display: flex;
                align-items: center;
                justify-content: center;
                cursor: pointer;
                padding: 0;
                z-index: var(--z-content-overlay);
                transition: background-color 0.25s ease, border-color 0.25s ease;
            }
            .desktop-carousel-view-toggle:hover {
                background: #1976D2;
                border-color: #1976D2;
            }
            .desktop-carousel-view-toggle:hover svg { color: #fff; }
            .desktop-carousel-view-toggle svg {
                width: 12px;
                height: 12px;
                color: #555;
                transition: color 0.25s ease;
            }
            .desktop-carousel-view-toggle.is-video {
                background: #1976D2;
                border-color: #1976D2;
            }
            .desktop-carousel-view-toggle.is-video svg { color: #fff; }
            .desktop-carousel-view-toggle .view-icon-media { display: none; }
            .desktop-carousel-view-toggle.is-video .view-icon-doc { display: none; }
            .desktop-carousel-view-toggle.is-video .view-icon-media { display: block; }

            /* 视频覆盖层 —— 覆盖内容区，不含上方菜单条 */
            .desktop-carousel-inner { position: relative; }
            .desktop-carousel-video-overlay {
                position: absolute;
                top: 36px;
                left: 0;
                right: 0;
                bottom: 0;
                background: #000;
                z-index: var(--z-content-high);
                display: none;
                overflow: hidden;
            }
            .desktop-carousel-video-overlay.active { display: block; }
            .desktop-carousel-video-overlay iframe {
                width: 100%;
                height: 100%;
                border: none;
            }
            /* 视频加载指示器 */
            .desktop-carousel-video-overlay .video-loading {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 12px;
                color: rgba(255,255,255,0.85);
                font-size: 14px;
                z-index: 1;
            }
            /* 加载指示器 —— 衔接式旋转线条（首尾相接的不停旋转）
               结构：暗色连续环（连接基线） + 数段亮线（首尾相扣） + 前导高光 */
            .desktop-carousel-video-overlay .video-loading .gradient-spinner {
                width: 48px;
                height: 48px;
                border-radius: 50%;
                position: relative;
                /* 暗色连续环：作为各段亮线“首尾相接”的连接基线 */
                background: rgba(108, 99, 255, 0.20);
                /* 挖空中心形成环形，露出下方黑色覆盖层 */
                -webkit-mask: radial-gradient(farthest-side, transparent 56%, #000 58%);
                        mask: radial-gradient(farthest-side, transparent 56%, #000 58%);
                animation: spin 1s linear infinite;
            }
            .desktop-carousel-video-overlay .video-loading .gradient-spinner::before {
                content: '';
                position: absolute;
                inset: 0;
                border-radius: 50%;
                /* 三段亮线，沿暗环首尾相扣地旋转 */
                background: conic-gradient(from 0deg,
                    #6c63ff 0deg 108deg,
                    transparent 108deg 132deg,
                    #9b96ff 132deg 240deg,
                    transparent 240deg 264deg,
                    #6c63ff 264deg 360deg
                );
            }
            .desktop-carousel-video-overlay .video-loading .gradient-spinner::after {
                content: '';
                position: absolute;
                inset: 0;
                border-radius: 50%;
                /* 前导高光，强化“衔接”动感 */
                background: conic-gradient(from 0deg,
                    rgba(255, 255, 255, 0.85) 0deg,
                    rgba(255, 255, 255, 0) 16deg
                );
            }
            @keyframes spin {
                to { transform: rotate(360deg); }
            }
            .desktop-carousel-video-overlay .video-loading.hidden { display: none; }
            /* 视频暂无提示 —— 场景暂无视频时替代 iframe 的占位 */
            .desktop-carousel-video-overlay .video-none {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 14px;
                color: rgba(255,255,255,0.7);
                font-size: 15px;
                letter-spacing: 0.02em;
                z-index: 1;
                user-select: none;
            }
            .desktop-carousel-video-overlay .video-none .video-none-icon {
                width: 56px;
                height: 56px;
                opacity: 0.75;
            }
            .desktop-carousel-slides {
                display: flex;
                width: 100%;
                height: 100%;
                transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            }
            .desktop-carousel-slide {
                min-width: 100%;
                height: 100%;
                display: flex;
                align-items: center;
                justify-content: center;
                background: #f8fafc;
            }
            .desktop-carousel-slide img {
                width: 100%;
                height: 100%;
                object-fit: contain;
                display: block;
                padding: 16px;
                box-sizing: border-box;
            }
            .desktop-carousel-img-col .desktop-carousel-btn {
                display: none;
            }
            .desktop-carousel-indicators {
                display: flex;
                justify-content: center;
                gap: 8px;
                margin-top: 24px;
            }
            .desktop-carousel-indicator {
                width: 8px;
                height: 8px;
                border-radius: 50%;
                background: #CBD5E1;
                border: none;
                cursor: pointer;
                padding: 0;
                transition: all 0.3s ease;
            }
            .desktop-carousel-indicator.active {
                background: #1976D2;
                width: 28px;
                border-radius: 999px;
            }

            /* 桌面端入场动画（纯 CSS，无 JS 依赖；backwards=延迟期间保持 from 帧，
               动画结束后回归正常样式，不覆盖 :hover/.active 的 transform） */
            @keyframes desktopRevealIn {
                from {
                    opacity: 0;
                    transform: translateY(28px);
                }
            }
            .desktop-reveal {
                animation: desktopRevealIn 0.8s ease backwards;
            }
            .desktop-reveal.delay-1 { animation-delay: 0.1s; }
            .desktop-reveal.delay-2 { animation-delay: 0.2s; }
            .desktop-reveal.delay-3 { animation-delay: 0.3s; }
            .desktop-reveal.delay-4 { animation-delay: 0.4s; }
            .desktop-reveal.delay-5 { animation-delay: 0.5s; }
        }

        /* ===== 移动端 Hero 与六大场景 ===== */
        @media (max-width: 768px) {
            .uc-hero {
                padding: 16px 22px 10px;
                text-align: center;
                background: linear-gradient(180deg, #F5F9FF 0%, #FFFFFF 100%);
                margin-top: 0 !important;
            }
            .uc-hero .eyebrow {
                display: inline-block;
                font-size: 12px;
                letter-spacing: 3px;
                color: #1976D2;
                font-weight: 700;
                margin-bottom: 10px;
            }
            .uc-hero h1 {
                font-size: 30px;
                font-weight: 800;
                color: #454F5E;
                margin: 0 0 10px;
                line-height: 1.3;
                letter-spacing: -0.5px;
            }
            .uc-hero p {
                font-size: 14px;
                color: #556675;
                line-height: 1.7;
                margin: 0 auto;
                max-width: 340px;
            }

            /* 六宫格概览 */
            .uc-grid {
                padding: 8px 16px 6px;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .uc-grid-item {
                background: #F6F9FD;
                border-radius: 14px;
                padding: 16px 12px 14px;
                cursor: pointer;
                transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
                position: relative;
                text-align: left;
                border: 1px solid transparent;
            }
            .uc-grid-item:active {
                transform: scale(0.97);
                background: #EAF2FC;
            }
            .uc-grid-num {
                font-size: 11px;
                color: #1976D2;
                font-weight: 700;
                letter-spacing: 1.5px;
                margin-bottom: 8px;
            }
            .uc-grid-title {
                font-size: 16px;
                font-weight: 700;
                color: #454F5E;
                margin: 0 0 6px;
                letter-spacing: -0.3px;
            }
            .uc-grid-desc {
                font-size: 12px;
                color: #6B7A89;
                line-height: 1.5;
                margin: 0;
            }
            .uc-grid-arrow {
                position: absolute;
                right: 12px;
                top: 14px;
                width: 22px;
                height: 22px;
                border-radius: 50%;
                background: #FFFFFF;
                color: #1976D2;
                font-size: 12px;
                display: flex;
                align-items: center;
                justify-content: center;
                box-shadow: 0 2px 6px rgba(25,118,210,0.12);
            }

            /* 细节区块 */
            .uc-detail {
                padding: 28px 0 8px;
                background: #fff;
            }
            .uc-detail-block {
                padding: 0 22px 40px;
            }
            .uc-detail-block.alt {
                background: #F6F9FD;
                padding: 36px 22px 40px;
            }
            .uc-detail-num {
                font-size: 12px;
                color: #1976D2;
                font-weight: 700;
                letter-spacing: 2px;
                margin-bottom: 10px;
                display: inline-block;
            }
            .uc-detail-title {
                font-size: 22px;
                font-weight: 800;
                color: #454F5E;
                margin: 0 0 10px;
                letter-spacing: -0.5px;
                line-height: 1.3;
            }
            .uc-detail-text {
                font-size: 14px;
                color: #556675;
                line-height: 1.75;
                margin: 0 0 18px;
            }
            .uc-detail-media {
                position: relative;
                width: 100%;
                border-radius: 16px;
                overflow: hidden;
                box-shadow: 0 14px 34px rgba(26,35,126,0.12);
                background: #EBF3FF;
                aspect-ratio: 4 / 3;
                margin-bottom: 16px;
            }
            .uc-detail-media img {
                width: 100%;
                height: 100%;
                object-fit: cover;
                display: block;
            }
            .uc-detail-media::after {
                content: "";
                position: absolute;
                inset: 0;
                background: linear-gradient(180deg, transparent 60%, rgba(11,18,32,0.12));
                pointer-events: none;
            }
            .uc-pill-list {
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
                margin: 4px 0 0;
                padding: 0;
                list-style: none;
            }
            .uc-pill-list li {
                font-size: 12px;
                color: #1976D2;
                background: #EBF3FF;
                padding: 6px 12px;
                border-radius: 999px;
                font-weight: 600;
            }

            /* 分隔线标题 */
            .uc-divider {
                padding: 18px 22px 6px;
                font-size: 12px;
                letter-spacing: 3px;
                color: #9AA6B2;
                font-weight: 700;
            }

            /* 统一展示区域 */
            .uc-showcase {
                padding: 6px 0 14px;
                background: #fff;
            }
            .uc-showcase-item {
                padding: 0 22px;
                animation: fadeIn 0.3s ease;
            }
            @keyframes fadeIn {
                from { opacity: 0; transform: translateY(8px); }
                to { opacity: 1; transform: translateY(0); }
            }

            /* 卡片激活状态 */
            .uc-grid-item.active {
                background: #E8F0FC;
                border-color: #1976D2;
            }
            .uc-grid-item.active .uc-grid-arrow {
                background: #1976D2;
                color: #fff;
            }

            /* 轮播图样式 */
            .uc-detail-media {
                position: relative;
                width: 100%;
                border-radius: 16px;
                overflow: hidden;
                box-shadow: 0 10px 26px rgba(26,35,126,0.1);
                background: #EBF3FF;
                aspect-ratio: 4 / 3;
                margin-bottom: 12px;
                margin-top: 8px;
            }
            .uc-carousel {
                position: relative;
                width: 100%;
                height: 100%;
                overflow: hidden;
                background: #f5f9ff;
            }
            .uc-carousel-track {
                display: flex;
                width: 100%;
                height: 100%;
                transition: transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1);
                touch-action: pan-y;
            }
            .uc-carousel-track img {
                min-width: 100%;
                height: 100%;
                object-fit: contain;
                display: block;
                user-select: none;
                -webkit-user-drag: none;
                cursor: zoom-in;
            }
            
            /* 手机端步骤教程样式 */
            .uc-tutorial-section {
                margin-top: 16px;
                padding: 20px;
                background: #FFFFFF;
                border-radius: 16px;
                border: 2px solid #1976D2;
                box-shadow: 0 4px 16px rgba(25, 118, 210, 0.12);
                overflow: hidden;
            }
            .uc-tutorial-item {
                position: relative;
                overflow: hidden;
            }
            .uc-tutorial-num {
                font-size: 12px;
                font-weight: 700;
                color: #1976D2;
                letter-spacing: 2px;
                margin-bottom: 10px;
                text-align: center;
                transition: transform 0.3s ease, opacity 0.3s ease;
            }
            .uc-tutorial-title {
                font-size: 18px;
                font-weight: 700;
                color: #454F5E;
                margin: 0 0 10px;
                text-align: center;
                transition: transform 0.3s ease, opacity 0.3s ease;
            }
            .uc-tutorial-desc {
                font-size: 14px;
                color: #556675;
                line-height: 1.6;
                margin: 0;
                text-align: center;
                transition: transform 0.3s ease, opacity 0.3s ease;
            }
            /* 文字向左滑出 */
            .uc-tutorial-num.slide-out,
            .uc-tutorial-title.slide-out,
            .uc-tutorial-desc.slide-out {
                transform: translateX(-100%);
                opacity: 0;
            }
            /* 文字从右侧滑入 */
            .uc-tutorial-num.slide-in,
            .uc-tutorial-title.slide-in,
            .uc-tutorial-desc.slide-in {
                transform: translateX(100%);
                opacity: 0;
            }
            /* 文字从左侧滑入（反向动画） */
            .uc-tutorial-num.slide-in-reverse,
            .uc-tutorial-title.slide-in-reverse,
            .uc-tutorial-desc.slide-in-reverse {
                transform: translateX(-100%);
                opacity: 0;
            }
            /* 文字向右滑出（反向动画） */
            .uc-tutorial-num.slide-out-reverse,
            .uc-tutorial-title.slide-out-reverse,
            .uc-tutorial-desc.slide-out-reverse {
                transform: translateX(100%);
                opacity: 0;
            }
            /* 边界提示样式 */
            .uc-tutorial-tip {
                position: absolute;
                left: 50%;
                transform: translateX(-50%) translateY(0);
                background: rgba(25, 118, 210, 0.9);
                color: #FFFFFF;
                padding: 8px 16px;
                border-radius: 20px;
                font-size: 13px;
                font-weight: 500;
                opacity: 0;
                transition: all 0.3s ease;
                z-index: var(--z-card);
                white-space: nowrap;
            }
            .uc-tutorial-tip.up {
                top: -40px;
            }
            .uc-tutorial-tip.down {
                bottom: -40px;
            }
            .uc-tutorial-tip.show {
                opacity: 1;
            }
            .uc-tutorial-tip.up.show {
                animation: bounceUp 0.5s ease;
            }
            .uc-tutorial-tip.down.show {
                animation: bounceDown 0.5s ease;
            }
            @keyframes bounceUp {
                0% { transform: translateX(-50%) translateY(10px); opacity: 0; }
                50% { transform: translateX(-50%) translateY(-5px); }
                100% { transform: translateX(-50%) translateY(0); opacity: 1; }
            }
            @keyframes bounceDown {
                0% { transform: translateX(-50%) translateY(-10px); opacity: 0; }
                50% { transform: translateX(-50%) translateY(5px); }
                100% { transform: translateX(-50%) translateY(0); opacity: 1; }
            }
            .uc-tutorial-actions {
                display: flex;
                align-items: center;
                justify-content: center;
                gap: 20px;
                margin-top: 16px;
                padding-top: 16px;
                border-top: 1px solid #E8ECF1;
            }
            .uc-tutorial-btn {
                display: none;
                width: 44px;
                height: 44px;
                background: #FFFFFF;
                color: #454F5E;
                border: 1px solid #E2E8F0;
                border-radius: 50%;
                font-size: 18px;
                cursor: pointer;
                align-items: center;
                justify-content: center;
                transition: all 0.25s ease;
            }
            .uc-tutorial-step {
                font-size: 13px;
                color: #94A3B8;
                font-weight: 500;
                min-width: 50px;
                text-align: center;
            }
            .uc-tutorial-dots {
                display: flex;
                justify-content: center;
                gap: 8px;
                margin-top: 14px;
            }
            .uc-tutorial-dot {
                width: 8px;
                height: 8px;
                border-radius: 50%;
                background: #E2E8F0;
                transition: all 0.3s ease;
            }
            .uc-tutorial-dot.active {
                background: #1976D2;
                width: 24px;
                border-radius: 4px;
            }

            /* 全屏图片预览 */
            .uc-fullscreen-overlay {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: rgba(0,0,0,0.92);
                z-index: var(--z-modal);
                display: none;
                align-items: center;
                justify-content: center;
                opacity: 0;
                transition: opacity 0.3s ease;
            }
            .uc-fullscreen-overlay.active {
                display: flex;
                opacity: 1;
            }
            .uc-fullscreen-img {
                max-width: 95%;
                max-height: 95%;
                object-fit: contain;
                opacity: 1;
                transform: translateX(0);
                transition: opacity 0.3s ease, transform 0.3s ease;
                animation: fullscreenZoomIn 0.3s ease;
            }
            @keyframes fullscreenZoomIn {
                from { transform: scale(0.9); opacity: 0; }
                to { transform: scale(1); opacity: 1; }
            }
            .uc-fullscreen-close {
                position: absolute;
                top: 20px;
                right: 20px;
                width: 44px;
                height: 44px;
                background: rgba(255,255,255,0.15);
                border: none;
                border-radius: 50%;
                color: #fff;
                font-size: 20px;
                cursor: pointer;
                display: flex;
                align-items: center;
                justify-content: center;
                backdrop-filter: blur(10px);
            }
            .uc-fullscreen-close:active {
                background: rgba(255,255,255,0.3);
            }
            .uc-fullscreen-prev,
            .uc-fullscreen-next {
                position: absolute;
                top: 50%;
                transform: translateY(-50%);
                width: 44px;
                height: 44px;
                background: rgba(255,255,255,0.15);
                border: none;
                border-radius: 50%;
                color: #fff;
                font-size: 18px;
                cursor: pointer;
                display: flex;
                align-items: center;
                justify-content: center;
                backdrop-filter: blur(10px);
                z-index: var(--z-content);
            }
            .uc-fullscreen-prev:active,
            .uc-fullscreen-next:active {
                background: rgba(255,255,255,0.3);
            }
            .uc-fullscreen-prev {
                left: 16px;
            }
            .uc-fullscreen-next {
                right: 16px;
            }
            .uc-fullscreen-dots {
                position: absolute;
                bottom: 20px;
                left: 50%;
                transform: translateX(-50%);
                display: flex;
                gap: 8px;
                z-index: var(--z-content);
            }
            .uc-fullscreen-dot {
                width: 10px;
                height: 10px;
                border-radius: 50%;
                background: rgba(255,255,255,0.4);
                border: none;
                cursor: pointer;
                padding: 0;
            }
            .uc-fullscreen-dot.active {
                background: #fff;
                transform: scale(1.2);
            }

            /* 入场动画 */
            .uc-reveal {
                opacity: 0;
                transform: translateY(22px);
                transition: opacity 0.7s ease, transform 0.7s ease;
            }
            .uc-reveal.is-visible {
                opacity: 1;
                transform: translateY(0);
            }
            .uc-reveal.delay-1 { transition-delay: 0.1s; }
            .uc-reveal.delay-2 { transition-delay: 0.2s; }
            .uc-reveal.delay-3 { transition-delay: 0.3s; }

            /* 温馨提示区块 */
            .uc-tip {
                padding: 20px 22px;
                background: #F3F8FF;
                border-radius: 14px;
                margin: 12px 22px 12px;
            }
            .uc-tip-title {
                font-size: 14px;
                font-weight: 700;
                color: #454F5E;
                margin: 0 0 8px;
            }
            .uc-tip-text {
                font-size: 13px;
                color: #556675;
                line-height: 1.6;
                margin: 0;
            }
            .uc-tip-link {
                color: #1976D2;
                text-decoration: none;
                font-weight: 600;
            }
            .uc-tip-content {
                display: block;
            }
            .uc-tip-content.is-hidden {
                display: none;
            }
            .uc-tip-content.is-visible .uc-tip-text {
                animation: tipFadeInUp 0.4s ease forwards;
            }
            .uc-tip-content.is-visible .uc-video-btn {
                animation: tipFadeInUp 0.4s ease 0.1s forwards;
                opacity: 0;
            }
            @keyframes tipFadeInUp {
                from {
                    opacity: 0;
                    transform: translateY(10px);
                }
                to {
                    opacity: 1;
                    transform: translateY(0);
                }
            }
            .uc-video-btn {
                display: inline-flex;
                align-items: center;
                justify-content: center;
                gap: 8px;
                margin-top: 12px;
                padding: 10px 20px;
                background: linear-gradient(135deg, #FB7299 0%, #FF6B81 100%);
                color: #FFFFFF;
                text-decoration: none;
                border-radius: 999px;
                font-size: 14px;
                font-weight: 600;
                box-shadow: 0 4px 12px rgba(251, 114, 153, 0.3);
                transition: transform 0.2s ease, box-shadow 0.2s ease;
            }
            .uc-video-btn:active {
                transform: scale(0.96);
                box-shadow: 0 2px 8px rgba(251, 114, 153, 0.25);
            }
            .uc-video-icon {
                width: 18px;
                height: 18px;
                flex-shrink: 0;
            }
        }

        /* 客户端下载按钮 */
        .client-download-wrap {
            position: relative;
            margin-left: auto;
            line-height: 56px;
            list-style: none;
            display: flex;
            align-items: center;
        }
        .client-download-btn {
            display: inline-block;
            text-decoration: none;
            padding: 6px 14px;
            background: transparent;
            color: #333;
            font-size: 13px;
            font-weight: 500;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.25s ease;
            font-family: inherit;
        }
        .client-download-btn:hover {
            background: transparent;
            color: #1976D2;
            transform: translateY(-1px);
        }
        .client-download-popup {
            position: absolute;
            top: calc(100% + 8px);
            right: 0;
            width: 164px;
            padding: 12px;
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 8px 30px rgba(0,0,0,0.15);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-6px);
            transition: all 0.25s ease;
            z-index: var(--z-nav-header);
            pointer-events: none;
            line-height: normal;
        }
        .client-download-popup::before {
            content: "";
            position: absolute;
            top: -6px;
            right: 20px;
            width: 12px;
            height: 12px;
            background: #fff;
            transform: rotate(45deg);
            border-radius: 2px;
        }
        .client-download-wrap:hover .client-download-popup,
        .client-download-popup:hover {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
        }
        .client-download-popup img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 4px;
        }
        .client-download-popup .popup-title {
            font-size: 14px;
            color: #333;
            text-align: center;
            margin-top: 8px;
            margin-bottom: 4px;
            font-weight: 500;
        }
        .client-download-popup .popup-desc {
            font-size: 12px;
            color: #999;
            text-align: center;
            margin: 0;
        }

        .client-download-wrap {
            display: none;
        }

        @media (min-width: 769px) {
            .client-download-wrap {
                display: flex;
                align-items: center;
            }
        }
    

        /* 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;
            }
        }

        /* ============================================================
           深色模式对比度优化（WCAG 4.5:1 标准）
           仅在用户手机端开启深色模式 (prefers-color-scheme: dark)
           且视口 ≤768px 时生效
           ============================================================ */
        @media (prefers-color-scheme: dark) and (max-width: 768px) {
            /* ===== 本页专属：套用中性灰黑主色调（参考 quick-start.html 同款）
               覆盖 theme-toggle.css 真源（蓝调 #121418/#1E2229 → 中性灰 #121212/#1E1E1E），
               仅作用于 use-cases.html 本页；其它 ks100 页不受影响 ===== */
            :root {
                color-scheme: dark !important;            /* 覆盖 tokens.css 的 light only，允许本页进入深色模式 */
                --surface-page: #121212 !important;       /* 页面大背景，深邃灰 */
                --surface-card: #1E1E1E !important;       /* 卡片/面板背景，微亮 */
                --surface-body: #171717 !important;       /* 次级面 */
                --text-primary: #FFFFFF !important;       /* 主文字，纯白 */
                --text-secondary: #E5E7EB !important;     /* 次文字，灰白 */
                --text-faint: #9CA3AF !important;         /* 辅助文字，舒适灰 */
                --line-default: rgba(255,255,255,0.1) !important;   /* 极淡白分割线 */
                --line-subtle: rgba(255,255,255,0.08) !important;
                --uc-page-bg: #121212 !important;
                --uc-hero-bg: #121212 !important;
                --uc-feature-bg: #1E1E1E !important;
                --uc-feature-bg-active: #252525 !important;
                --uc-capsule-btn: #1E1E1E !important;
                --uc-icon: #6BA5F7 !important;
                --uc-num: #6BA5F7 !important;
                --uc-title-white: #FFFFFF !important;
                --uc-body: #E5E7EB !important;
                --uc-carousel-bg: #171717 !important;
                --uc-pill-bg: #2A2A2A !important;
                --uc-card-bg: #1E1E1E !important;
                --uc-accent-border: rgba(255,255,255,0.1) !important;
                --uc-title-color: #E5E7EB !important;
                --uc-desc-color: #9CA3AF !important;
            }
            /* 移动端整页背景：中性灰（覆盖 .mobile-content 写死的 #FFFFFF） */
            .mobile-content { background: var(--uc-page-bg) !important; }
            /* 页面背景：复用参考图暗色 */
            html, body { background: var(--uc-page-bg); }
            .mobile-content { background: var(--uc-page-bg); }

            /* Hero 区暗底 #151921 */
            .uc-hero {
                background: var(--uc-hero-bg);
            }
            .uc-hero .eyebrow { color: var(--brand-primary); }
            .uc-hero h1 { color: var(--text-primary); }
            .uc-hero p { color: var(--text-secondary); }

            /* 功能卡片暗底 #1E2430 + 图标浅蓝 */
            .uc-grid-item { background: var(--uc-feature-bg); }
            .uc-grid-num { color: var(--brand-primary); }
            .uc-grid-title { color: var(--text-primary); }
            .uc-grid-desc { color: var(--text-secondary); }
            .uc-grid-arrow { color: var(--uc-icon); }

            /* 选中/激活卡片 #232B3E */
            .uc-grid-item.active {
                background: var(--uc-feature-bg-active);
                border-color: var(--brand-primary);
            }
            .uc-grid-item.active .uc-grid-arrow {
                background: var(--brand-primary);
                color: var(--surface-page);
            }

            .uc-detail { background: var(--uc-page-bg); }
            .uc-detail-block.alt { background: var(--uc-page-bg); }
            .uc-detail-num { color: var(--uc-num); }
            .uc-detail-title { color: var(--uc-title-white); font-weight: 800; }
            .uc-detail-text { color: var(--uc-body); }

            .uc-showcase { background: var(--uc-page-bg); }

            .uc-tutorial-section { background: var(--uc-page-bg); }
            .uc-tutorial-num { color: var(--uc-num); }
            .uc-tutorial-title { color: var(--text-primary); }

            /* 胶囊按钮暗底 #2D3748 + 浅蓝箭头 */
            .uc-tutorial-btn {
                background: var(--uc-capsule-btn);
                color: var(--uc-icon);
                border-color: var(--line-default);
            }

            /* 轮播图背景 #D6EAF8 */
            .uc-detail-media,
            .uc-carousel,
            .desktop-carousel-slide {
                background: var(--uc-carousel-bg);
            }

            /* 胶囊背景 #BBDEFB + 极细边框/低透投影 + 标题深黑 + 文字阴影 */
            .uc-pill-list li {
                background: var(--uc-pill-bg);
                border: 1px solid var(--uc-accent-border);
                box-shadow: 0 2px 4px rgba(0,0,0,0.05);
                color: var(--uc-title-color);
                text-shadow: 0 1px 2px rgba(0,0,0,0.1);
            }

            /* 卡片背景 #C5E1F5 + 极细边框/低透投影 + 文字明度分级 */
            .uc-tip {
                background: var(--uc-card-bg);
                border: 1px solid var(--uc-accent-border);
                box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            }
            .uc-tip-title { color: var(--uc-title-color); text-shadow: 0 1px 2px rgba(0,0,0,0.1); }
            .uc-tip-text  { color: var(--uc-desc-color);  text-shadow: 0 1px 2px rgba(0,0,0,0.1); }
            .uc-tip-link  { color: var(--brand-primary); }

            /* 1. 说明文字：提亮到 --text-secondary (#CFD8DC)，确保弱屏下仍清晰可读 */
            .uc-tutorial-desc { color: var(--text-secondary); }
            .uc-showcase-desc { color: var(--text-secondary); }
            .desktop-showcase-desc { color: var(--text-secondary); }
            .desktop-showcase-features li { color: var(--text-secondary); }
            .uc-tutorial-step { color: var(--text-faint); }

            /* 2. 右箭头（禁用态/边界态） */
            .uc-tutorial-btn.next {
                border-color: var(--line-subtle);
            }
            .uc-tutorial-btn.prev {
                border-color: var(--line-default);
            }

            /* 3. 分隔线 */
            .uc-showcase-item { border-color: var(--line-default); }
            hr, .uc-divider { border-color: var(--line-default); }

            /* 4. 底部备案信息 */
            .guide-footer { color: var(--text-faint); }
            .footer-text, .filing-info { color: var(--text-faint); }

            /* 5. 卡片发光边框：外发光补充光晕效果，弥补暗屏亮度不足 */
            .desktop-showcase-card,
            .uc-showcase-card {
                box-shadow: 0 0 8px var(--card-glow);
            }
        }