:root {
            --primary: #00bb61;
            --primary-dark: #009a4f;
            --primary-darker: #007a40;
            --primary-light: #e6f9ef;
            --primary-lighter: #f0fbf5;
            --text-dark: #1a1a2e;
            --text-medium: #4a4a5a;
            --text-light: #8a8a9a;
            --bg-white: #ffffff;
            --bg-section: #f7f8fa;
            --border: #e8e8ee;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 40px rgba(0,0,0,0.08);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
        }

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

        img {
            border-radius: 4px;
        }

        /* 页面展示图（不含画质修复对比区）最大 540×304，小屏等比缩放 */
        .hero-image .img-wrap,
        .tab-image,
        .pitch-image,
        .transparent-image,
        .subtitle-image,
        .brand-image {
            width: 100%;
            max-width: 540px;
            aspect-ratio: 540 / 304;
            height: auto;
            flex-shrink: 1;
        }
        .hero-image .img-wrap img,
        .tab-image img,
        .pitch-image img,
        .transparent-image img,
        .subtitle-image img,
        .brand-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        html { scroll-behavior: smooth; }

        body {
            font-family: 'Noto Sans SC', sans-serif;
            background: var(--bg-white);
            color: var(--text-dark);
            overflow-x: hidden;
            line-height: 1.6;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
            container-type: inline-size;
            container-name: page;
        }

        /* 隔离 Discuz 全局 .container（module.css 有 width:120px + absolute） */
        .ktv-portal {
            width: 100%;
            max-width: 100%;
            box-sizing: border-box;
        }
        .ktv-portal .container {
            position: static !important;
            top: auto !important;
            right: auto !important;
            width: 100% !important;
            max-width: 1280px !important;
            min-width: 0 !important;
            margin: 0 auto !important;
            padding: 0 32px !important;
            border: none !important;
            background: transparent !important;
            border-radius: 0 !important;
            box-sizing: border-box !important;
            container-type: inline-size;
            container-name: page;
        }

        /* ===== 通用按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 500;
            font-family: inherit;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
            text-decoration: none;
            border: none;
            outline: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 4px 16px rgba(0,187,97,0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0,187,97,0.4);
        }
        .btn-outline {
            background: var(--bg-white);
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .section-actions {
            margin-top: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .section-actions--center {
            justify-content: center;
            margin-top: 28px;
        }

        /* ===== 通用区块标题 ===== */
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-medium);
            max-width: 680px;
            margin: 0 auto;
        }
        .section-header .accent-line {
            width: 48px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            margin: 16px auto 0;
        }

        /* ===== 滚动出现动画 ===== */
        .reveal {
            opacity: 0;
            transform: translateY(36px);
            transition: opacity 0.7s cubic-bezier(0.4,0,0.2,1), transform 0.7s cubic-bezier(0.4,0,0.2,1);
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        @media (prefers-reduced-motion: reduce) {
            .reveal { opacity: 1; transform: none; transition: none; }
        }

        /* ======================================
           模块1：Hero
        ====================================== */
        .hero {
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -200px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0,187,97,0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -150px;
            left: -150px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0,187,97,0.04) 0%, transparent 70%);
            pointer-events: none;
        }
        /* 图文分栏：默认上下堆叠，避免窄屏仍左右挤压 */
        .hero-inner,
        .tracks .tab-inner,
        .pitch .pitch-inner,
        .subtitle-inner,
        .transparent-lyrics .transparent-inner {
            display: flex;
            flex-direction: column;
            align-items: stretch;
            gap: 32px;
            width: 100%;
        }
        .hero-inner {
            position: relative;
            z-index: 1;
        }
        .hero-content,
        .tracks .tab-text,
        .pitch .pitch-text,
        .subtitle-text,
        .transparent-lyrics .transparent-text {
            flex: none;
            width: 100%;
            max-width: 100%;
            min-width: 0;
        }
        .hero-image,
        .tab-image,
        .pitch-image,
        .subtitle-image,
        .transparent-lyrics .transparent-image {
            flex: none;
            width: 100%;
            max-width: 540px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 24px;
        }
        .hero-badge i { font-size: 12px; }
        .hero-content h1 {
            font-size: 46px;
            font-weight: 900;
            line-height: 1.2;
            color: var(--text-dark);
            margin-bottom: 16px;
            word-break: keep-all;
            overflow-wrap: break-word;
        }
        .hero-content h1 span {
            color: var(--primary);
        }
        .hero-subtitle {
            font-size: 20px;
            color: var(--primary-dark);
            font-weight: 500;
            margin-bottom: 20px;
        }
        .hero-desc {
            font-size: 16px;
            color: var(--text-medium);
            margin-bottom: 8px;
            line-height: 1.7;
        }
        .hero-desc:last-of-type { margin-bottom: 32px; }
        .hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-image {
            position: relative;
        }
        .hero-image .img-wrap {
            border-radius: 4px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
            background: var(--bg-section);
        }
        .hero-image .img-wrap::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 4px;
            border: 1px solid rgba(0,187,97,0.1);
            pointer-events: none;
        }

        /* ======================================
           模块2：特性亮点（图1横向排版）
        ====================================== */
        .stats {
            padding: 48px 0 56px;
            background: var(--bg-white);
        }
        .stats-grid {
            display: flex;
            flex-direction: column;
            align-items: stretch;
            gap: 24px;
        }
        .stat-card {
            flex: none;
            width: 100%;
            min-width: 0;
            display: flex;
            align-items: center;
            gap: 14px;
            background: transparent;
            border: none;
            box-shadow: none;
            padding: 0;
            text-align: left;
        }
        .stat-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
        }
        .stat-icon svg {
            width: 44px;
            height: 44px;
            display: block;
        }
        .stat-text {
            min-width: 0;
        }
        .stat-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
            line-height: 1.35;
            white-space: nowrap;
        }
        .stat-desc {
            font-size: 13px;
            font-weight: 400;
            color: var(--text-light);
            line-height: 1.5;
        }

        /* ======================================
           定制流程
        ====================================== */
        .process {
            padding: 80px 0;
        }
        .process-steps {
            display: flex;
            align-items: flex-start;
            justify-content: center;
            gap: 0;
            position: relative;
        }
        .step-item {
            flex: 1;
            text-align: center;
            position: relative;
            padding: 0 16px;
        }
        .step-item:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 28px;
            left: calc(50% + 32px);
            right: calc(-50% + 32px);
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
        }
        .step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-size: 22px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            position: relative;
            z-index: 2;
            box-shadow: 0 4px 16px rgba(0,187,97,0.25);
        }
        .step-text {
            font-size: 15px;
            color: var(--text-medium);
            line-height: 1.6;
            max-width: 200px;
            margin: 0 auto;
        }

        /* ======================================
           模块3：音轨Tab
        ====================================== */
        .tracks {
            padding: 80px 0;
            background: var(--bg-section);
        }
        .tab-nav {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }
        .tab-btn {
            padding: 12px 28px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 500;
            font-family: inherit;
            cursor: pointer;
            border: 2px solid var(--border);
            background: var(--bg-white);
            color: var(--text-medium);
            transition: all 0.3s ease;
        }
        .tab-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        .tab-btn.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(0,187,97,0.3);
        }
        .tab-panel {
            display: none;
            animation: tabFadeIn 0.4s ease;
        }
        .tab-panel.active { display: block; }
        @keyframes tabFadeIn {
            from { opacity: 0; transform: translateY(12px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .tracks .tab-panels {
            width: 100%;
        }
        .tracks .tab-inner {
            justify-content: flex-start;
        }
        .tab-image {
            border-radius: 4px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--bg-white);
        }
        .tab-text h3 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
        }
        .tab-text .tab-desc {
            font-size: 16px;
            color: var(--text-medium);
            line-height: 1.8;
            margin-bottom: 8px;
        }
        .tab-text .tab-highlight {
            color: var(--primary);
            font-weight: 500;
        }
        .tab-features {
            margin-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .tab-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-medium);
        }
        .tab-feature-item i {
            color: var(--primary);
            margin-top: 4px;
            font-size: 13px;
        }

        /* ======================================
           透明歌词伴奏视频（左文右图）
        ====================================== */
        .transparent-lyrics {
            padding: 80px 0;
            background: var(--bg-section);
        }
        .transparent-lyrics .transparent-text h3 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .transparent-lyrics .transparent-text .tab-desc {
            margin-bottom: 4px;
        }
        .transparent-lyrics .transparent-text .tab-features {
            margin-top: 20px;
        }
        .transparent-lyrics .transparent-text .tab-feature-item .feature-name {
            font-weight: 600;
            color: var(--text-dark);
        }
        .transparent-lyrics .transparent-image {
            border-radius: 4px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--bg-section);
            position: relative;
        }

        /* ======================================
           模块4：染色字幕
        ====================================== */
        .subtitle-section {
            padding: 80px 0;
        }
        .subtitle-text h3 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .subtitle-text .tab-desc {
            margin-bottom: 4px;
        }
        .subtitle-text .tab-features {
            margin-top: 20px;
        }
        .subtitle-text .tab-feature-item .feature-name {
            font-weight: 600;
            color: var(--text-dark);
        }
        .subtitle-image {
            border-radius: 4px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--bg-section);
            position: relative;
        }

        /* ======================================
           视频伴奏升调降调（左图右文）
        ====================================== */
        .pitch {
            padding: 80px 0;
            background: var(--bg-white);
        }
        .pitch .pitch-inner {
            justify-content: flex-start;
        }
        .pitch-image {
            border-radius: 4px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--bg-white);
        }
        /* ======================================
           模块5：画质修复对比
        ====================================== */
        .repair {
            padding: 80px 0;
            background: var(--bg-section);
        }
        .compare-wrapper {
            max-width: 1100px;
            margin: 0 auto;
        }
        .compare-container {
            position: relative;
            width: 100%;
            max-width: 1100px;
            aspect-ratio: 1100 / 619;
            height: auto;
            border-radius: 4px;
            overflow: hidden;
            cursor: ew-resize;
            box-shadow: var(--shadow-lg);
            background: #000;
        }
        .compare-after,
        .compare-before {
            position: absolute;
            top: 0; left: 0;
            width: 100%;
            height: 100%;
        }
        .compare-after img,
        .compare-before img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .compare-before {
            z-index: 2;
            clip-path: inset(0 50% 0 0);
        }
       
        .compare-divider {
            position: absolute;
            top: 0;
            left: 50%;
            width: 3px;
            height: 100%;
            background: #fff;
            z-index: 10;
            transform: translateX(-50%);
            box-shadow: 0 0 12px rgba(0,0,0,0.5);
        }
        .compare-handle {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #fff;
            box-shadow: 0 2px 12px rgba(0,0,0,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }
        .compare-handle i {
            font-size: 12px;
            color: var(--text-medium);
        }
        .compare-label {
            position: absolute;
            top: 16px;
            padding: 6px 14px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            z-index: 5;
            backdrop-filter: blur(4px);
        }
        .compare-label.before {
            left: 16px;
            background: rgba(0,0,0,0.5);
            color: #fff;
        }
        .compare-label.after {
            right: 16px;
            background: rgba(0,187,97,0.8);
            color: #fff;
        }
        /* 缩略图选择 */
        .compare-thumbs {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: 20px;
        }
        .compare-thumb {
            aspect-ratio: 16/9;
            border-radius: 4px;
            overflow: hidden;
            cursor: pointer;
            border: 3px solid transparent;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .compare-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .compare-thumb:hover {
            border-color: var(--primary-light);
            transform: translateY(-2px);
        }
        .compare-thumb.active {
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(0,187,97,0.3);
        }
        .compare-thumb-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 4px 8px;
            background: linear-gradient(transparent, rgba(0,0,0,0.6));
            color: #fff;
            font-size: 12px;
            text-align: center;
        }

        /* ======================================
           模块6：多平台播放
        ====================================== */
        .platform {
            padding: 80px 0;
        }
        .platform-content {
            text-align: center;
        }
        .platform-desc {
            font-size: 17px;
            color: var(--text-medium);
            margin-bottom: 8px;
        }
        .platform-format {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin: 32px 0 48px;
            flex-wrap: wrap;
        }
        .format-tag {
            padding: 8px 20px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 1px;
        }
        .devices-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-bottom: 40px;
        }
        .device-card {
            background: var(--bg-section);
            border-radius: var(--radius);
            padding: 36px 20px;
            text-align: center;
            transition: all 0.3s ease;
            border: 1px solid var(--border);
        }
        .device-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(0,187,97,0.2);
        }
        .device-icon {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-light), var(--primary-lighter));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 28px;
            color: var(--primary);
            transition: all 0.3s ease;
        }
        .device-card:hover .device-icon {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 4px 16px rgba(0,187,97,0.3);
        }
        .device-name {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 4px;
        }
        .device-sub {
            font-size: 13px;
            color: var(--text-light);
        }
        .platform-note {
            font-size: 15px;
            color: var(--text-medium);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .platform-note i { color: var(--primary); }

        /* ======================================
           模块7：扬声/瑞影
        ====================================== */
        .brand {
            padding: 80px 0;
            background: var(--bg-section);
        }
        .brand-desc {
            text-align: center;
            font-size: 16px;
            color: var(--text-medium);
            max-width: 600px;
            margin: -8px auto 40px;
            line-height: 1.7;
        }
        .brand .brand-tab-content {
            width: 100%;
        }
        .brand .compare-thumbs .compare-thumb[data-brand] {
            position: relative;
        }
        .brand .compare-thumbs .compare-thumb:not(.active) {
            opacity: 0.72;
        }
        .brand .compare-thumbs .compare-thumb.active {
            opacity: 1;
        }
        /* ===== 黑暗模式（跟随 discuzx5 全站 html.dz-dark 开关） ===== */
        html.dz-dark {
            color-scheme: dark;
            --primary: #00d46a;
            --primary-dark: #00bb61;
            --primary-darker: #009a4f;
            --primary-light: rgba(0, 187, 97, 0.18);
            --primary-lighter: rgba(0, 187, 97, 0.1);
            --text-dark: #e8e8e8;
            --text-medium: #b0b0b0;
            --text-light: #8e8e8e;
            --bg-white: #121212;
            --bg-section: #1a1a1a;
            --border: #3a3a3a;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.45);
        }

        html.dz-dark body {
            background: var(--bg-white);
            color: var(--text-dark);
        }

        html.dz-dark .hero::before {
            background: radial-gradient(circle, rgba(0, 187, 97, 0.12) 0%, transparent 70%);
        }

        html.dz-dark .hero::after {
            background: radial-gradient(circle, rgba(0, 187, 97, 0.08) 0%, transparent 70%);
        }

        html.dz-dark .tab-btn:not(.active):hover {
            background: var(--primary-lighter);
        }

        html.dz-dark .device-card:hover {
            border-color: rgba(0, 187, 97, 0.35);
        }

        /* 仅当 .container 实际宽度足够才左右分栏（不用视口宽度！） */
        @container page (min-width: 1025px) {
            .hero-inner {
                flex-direction: row;
                align-items: center;
                gap: 60px;
            }
            .hero-content {
                flex: 1;
                width: auto;
                min-width: 0;
            }
            .hero-image {
                flex: 0 0 540px;
                width: 540px;
                max-width: 540px;
                margin: 0;
            }
            .stats-grid {
                flex-direction: row;
                align-items: flex-start;
                justify-content: space-between;
                gap: 32px;
            }
            .stat-card {
                flex: 1;
                width: auto;
            }
            .tracks .tab-inner,
            .pitch .pitch-inner {
                flex-direction: row;
                align-items: center;
                justify-content: center;
                gap: 96px;
            }
            .tracks .tab-text {
                flex: 0 0 580px;
                max-width: 580px;
            }
            .pitch .pitch-text {
                flex: 0 0 580px;
                max-width: 580px;
            }
            .subtitle-inner,
            .transparent-lyrics .transparent-inner {
                flex-direction: row;
                align-items: center;
                gap: 56px;
            }
            .subtitle-text,
            .transparent-lyrics .transparent-text {
                flex: 1;
                width: auto;
            }
            .tab-image,
            .pitch-image,
            .subtitle-image,
            .transparent-lyrics .transparent-image {
                flex: 0 0 540px;
                width: 540px;
                max-width: 540px;
                margin: 0;
            }
        }

        @container page (min-width: 769px) and (max-width: 1024px) {
            .stats-grid {
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: center;
                gap: 28px 40px;
            }
            .stat-card {
                flex: 0 1 calc(50% - 20px);
                max-width: 320px;
                width: auto;
            }
        }

        /* JS 按元素实际宽度切换（直接加在 hero-inner 上） */
        .hero-inner.layout-row,
        .tracks .tab-inner.layout-row,
        .pitch .pitch-inner.layout-row,
        .subtitle-inner.layout-row,
        .transparent-lyrics .transparent-inner.layout-row {
            flex-direction: row;
            align-items: center;
        }
        .hero-inner.layout-row {
            gap: 60px;
        }
        .hero-inner.layout-row .hero-content {
            flex: 1;
            width: auto;
            min-width: 0;
        }
        .hero-inner.layout-row .hero-image {
            flex: 0 0 540px;
            width: 540px;
            max-width: 540px;
            margin: 0;
        }
        .tracks .tab-inner.layout-row,
        .pitch .pitch-inner.layout-row {
            justify-content: center;
            gap: 96px;
        }
        .tracks .tab-inner.layout-row .tab-text {
            flex: 0 0 580px;
            max-width: 580px;
        }
        .pitch .pitch-inner.layout-row .pitch-text {
            flex: 0 0 580px;
            max-width: 580px;
        }
        .subtitle-inner.layout-row,
        .transparent-lyrics .transparent-inner.layout-row {
            gap: 56px;
        }
        .subtitle-inner.layout-row .subtitle-text,
        .transparent-lyrics .transparent-inner.layout-row .transparent-text {
            flex: 1;
            width: auto;
        }
        .tracks .tab-inner.layout-row .tab-image,
        .pitch .pitch-inner.layout-row .pitch-image,
        .subtitle-inner.layout-row .subtitle-image,
        .transparent-lyrics .transparent-inner.layout-row .transparent-image {
            flex: 0 0 540px;
            width: 540px;
            max-width: 540px;
            margin: 0;
        }
        .stats-grid.layout-row {
            flex-direction: row;
            align-items: flex-start;
            justify-content: space-between;
            gap: 32px;
        }
        .stats-grid.layout-row .stat-card {
            flex: 1;
            width: auto;
        }

        .hero-inner.layout-stack,
        .tracks .tab-inner.layout-stack,
        .pitch .pitch-inner.layout-stack,
        .subtitle-inner.layout-stack,
        .transparent-lyrics .transparent-inner.layout-stack {
            flex-direction: column !important;
            align-items: stretch !important;
        }
        .hero-inner.layout-stack .hero-content,
        .tracks .tab-inner.layout-stack .tab-text,
        .pitch .pitch-inner.layout-stack .pitch-text,
        .subtitle-inner.layout-stack .subtitle-text,
        .transparent-lyrics .transparent-inner.layout-stack .transparent-text {
            flex: none !important;
            width: 100% !important;
            max-width: 100% !important;
            min-width: 0 !important;
        }
        .hero-inner.layout-stack .hero-image,
        .tracks .tab-inner.layout-stack .tab-image,
        .pitch .pitch-inner.layout-stack .pitch-image,
        .subtitle-inner.layout-stack .subtitle-image,
        .transparent-lyrics .transparent-inner.layout-stack .transparent-image {
            flex: none !important;
            width: 100% !important;
            max-width: 540px !important;
            margin-left: auto !important;
            margin-right: auto !important;
        }
        .stats-grid.layout-stack {
            flex-direction: column !important;
        }
        .stats-grid.layout-stack .stat-card {
            flex: none !important;
            width: 100% !important;
        }
        .stats-grid.layout-stack .stat-title {
            white-space: normal !important;
        }

        /* ===== 响应式（字号/间距） ===== */

        @media (max-width: 1024px) {
            .hero-content h1 { font-size: 36px; }
        }

        @media (max-width: 768px) {
            .container { padding: 0 20px; }
            .hero { padding: 48px 0 40px; }
            .hero-content h1 { font-size: 30px; }
            .hero-subtitle { font-size: 17px; }
            .hero-desc { font-size: 15px; }
            .hero-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-buttons .btn { width: 100%; }
            .section-header h2 { font-size: 28px; }
            .section-header p { font-size: 15px; }
            .section-header { margin-bottom: 36px; }
            .section-actions { justify-content: center; }
            .section-actions .btn { flex: 1 1 auto; min-width: 0; }
            .stats { padding: 40px 0; }
            .stats-grid { flex-direction: column; align-items: stretch; gap: 24px; }
            .stat-card { flex: none; max-width: none; width: 100%; }
            .stat-title { font-size: 15px; }
            .process { padding: 56px 0; }
            .process-steps { flex-direction: column; align-items: center; gap: 24px; }
            .step-item { width: 100%; max-width: 320px; }
            .step-item:not(:last-child)::after { display: none; }
            .step-text { max-width: none; }
            .tracks { padding: 56px 0; }
            .pitch { padding: 56px 0; }
            .tab-nav {
                gap: 6px;
                justify-content: flex-start;
                flex-wrap: nowrap;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                padding-bottom: 4px;
                margin-left: -4px;
                margin-right: -4px;
                padding-left: 4px;
                padding-right: 4px;
            }
            .tab-btn {
                padding: 10px 18px;
                font-size: 13px;
                flex-shrink: 0;
            }
            .tab-text h3,
            .transparent-lyrics .transparent-text h3,
            .subtitle-text h3,
            .pitch .pitch-text h3 {
                font-size: 22px;
            }
            .subtitle-section { padding: 56px 0; }
            .transparent-lyrics { padding: 56px 0; }
            .repair { padding: 56px 0; }
            .compare-wrapper { width: 100%; }
            .compare-thumbs { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .compare-label { font-size: 12px; padding: 5px 10px; }
            .compare-handle { width: 36px; height: 36px; }
            .platform { padding: 56px 0; }
            .devices-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .device-card { padding: 24px 12px; }
            .brand { padding: 56px 0; }
            .btn { padding: 12px 28px; font-size: 15px; }
        }

        @media (max-width: 480px) {
            .container { padding: 0 16px; }
            .hero-content h1 { font-size: 26px; }
            .hero-badge { font-size: 13px; padding: 5px 14px; }
            .stats-grid { gap: 20px; }
            .stat-icon { width: 36px; height: 36px; }
            .stat-icon svg { width: 36px; height: 36px; }
            .tab-btn { padding: 8px 14px; font-size: 12px; }
            .tab-text .tab-desc,
            .transparent-lyrics .transparent-text .tab-desc,
            .subtitle-text .tab-desc { font-size: 14px; }
            .devices-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .device-icon { width: 56px; height: 56px; font-size: 22px; }
            .device-name { font-size: 14px; }
            .format-tag { font-size: 12px; padding: 6px 14px; }
            .compare-thumbs { gap: 8px; }
            .compare-thumb-label { font-size: 11px; }
            .platform-note {
                flex-direction: column;
                text-align: center;
            }
        }