/* roulang page: index */
:root {
            --primary: #C85A32;
            --primary-hover: #AF4A24;
            --primary-light: #FBF2EE;
            --secondary: #2B303A;
            --secondary-light: #414856;
            --dark-inset: #16181D;
            --bg-alabaster: #F9F8F6;
            --bg-card: #FFFFFF;
            --border-color: #E7E5E0;
            --border-dark: #2C303B;
            --text-main: #1D2129;
            --text-body: #4E5969;
            --text-muted: #86909C;
            --success: #2D7A58;
            --shadow-subtle: 0 4px 20px -2px rgba(43, 48, 58, 0.05), 0 2px 6px -1px rgba(43, 48, 58, 0.03);
            --shadow-hover: 0 14px 34px -4px rgba(43, 48, 58, 0.09);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --transition: all 0.25s ease-in-out;
            --max-width: 1280px;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-alabaster);
            color: var(--text-body);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }

        /* 布局容器 */
        .container {
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 锚点防遮挡 */
        section {
            scroll-margin-top: 88px;
            padding: 88px 0;
        }

        /* 标题层级 */
        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 52px;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--primary);
            background: var(--primary-light);
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--secondary);
            line-height: 1.35;
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 按钮体系 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(200, 90, 50, 0.35);
        }

        .btn-secondary {
            background-color: var(--secondary);
            color: #FFFFFF;
        }

        .btn-secondary:hover {
            background-color: var(--secondary-light);
            transform: translateY(-1px);
        }

        .btn-outline {
            border-color: var(--border-color);
            background: #FFFFFF;
            color: var(--secondary);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .btn-coupon {
            background: #FFFFFF;
            color: var(--primary);
            font-weight: 700;
            border: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }

        .btn-coupon:hover {
            background: #FDF9F7;
            transform: scale(1.02);
        }

        /* 顶部通栏 */
        .top-bar {
            background-color: #20242C;
            color: #B5BAC2;
            font-size: 13px;
            border-bottom: 1px solid #2F3540;
            padding: 7px 0;
        }

        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .top-bar-info {
            display: flex;
            gap: 20px;
        }

        .top-bar-badge {
            background: rgba(200, 90, 50, 0.2);
            color: #E28867;
            padding: 2px 8px;
            border-radius: 2px;
            font-size: 12px;
        }

        /* 主导航栏 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 21px;
            font-weight: 700;
            color: var(--secondary);
            letter-spacing: -0.01em;
        }

        .brand-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            color: #FFFFFF;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 17px;
        }

        .brand-text-sub {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: 400;
            margin-left: 4px;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 26px;
        }

        .nav-link {
            font-size: 15px;
            color: var(--secondary);
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }

        .nav-link:hover {
            color: var(--primary);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--secondary);
            margin: 5px 0;
            transition: var(--transition);
        }

        /* 1. 首屏 HERO + 优惠券墙入口 */
        .hero-section {
            padding: 48px 0 80px;
            background: linear-gradient(180deg, #F9F8F6 0%, #FFFFFF 100%);
            border-bottom: 1px solid var(--border-color);
        }

        .coupon-wall {
            background: linear-gradient(90deg, #C85A32 0%, #E0734A 100%);
            border-radius: var(--radius-md);
            padding: 20px 28px;
            margin-bottom: 48px;
            color: #FFFFFF;
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 10px 24px -4px rgba(200, 90, 50, 0.25);
        }

        .coupon-left {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .coupon-tag {
            background: rgba(255,255,255,0.22);
            border: 1px dashed rgba(255,255,255,0.6);
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
        }

        .coupon-amount {
            font-size: 32px;
            font-weight: 800;
            line-height: 1;
        }

        .coupon-desc {
            font-size: 15px;
            opacity: 0.95;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 42px;
            font-weight: 800;
            line-height: 1.25;
            color: var(--secondary);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .hero-lead {
            font-size: 17px;
            line-height: 1.7;
            color: var(--text-body);
            margin-bottom: 32px;
        }

        .hero-cta-group {
            display: flex;
            gap: 16px;
            margin-bottom: 36px;
        }

        .hero-tags-strip {
            display: flex;
            gap: 24px;
            font-size: 14px;
            color: var(--text-muted);
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
        }

        .hero-tags-strip span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-tags-strip span::before {
            content: "✓";
            color: var(--primary);
            font-weight: bold;
        }

        .hero-stage {
            position: relative;
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 8px;
            box-shadow: var(--shadow-hover);
        }

        .hero-stage img {
            border-radius: 4px;
            width: 100%;
            height: 380px;
            object-fit: cover;
        }

        .hero-badge-float {
            position: absolute;
            bottom: 24px;
            left: 24px;
            background: rgba(22, 24, 29, 0.88);
            backdrop-filter: blur(8px);
            color: #FFFFFF;
            padding: 12px 18px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .hero-badge-float b {
            color: #E28867;
            display: block;
            font-size: 16px;
            margin-bottom: 2px;
        }

        /* 2. 数据指标看板 */
        .metrics-section {
            background: #FFFFFF;
            border-bottom: 1px solid var(--border-color);
            padding: 56px 0;
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .metric-card {
            padding: 24px;
            background: var(--bg-alabaster);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            text-align: center;
            transition: var(--transition);
        }

        .metric-card:hover {
            transform: translateY(-3px);
            border-color: var(--primary);
        }

        .metric-val {
            font-size: 38px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
        }

        .metric-label {
            font-size: 16px;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 6px;
        }

        .metric-sub {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 3. 核心引擎与技术认证 */
        .engine-section {
            background: var(--bg-alabaster);
        }

        .engine-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 52px;
            align-items: center;
        }

        .engine-info h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 18px;
            line-height: 1.35;
        }

        .engine-info p {
            margin-bottom: 20px;
            line-height: 1.7;
        }

        .engine-specs {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            margin-top: 24px;
        }

        .spec-item {
            display: flex;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px solid #F0EFEA;
            font-size: 14px;
        }

        .spec-item:last-child {
            border-bottom: none;
        }

        .spec-key {
            color: var(--text-muted);
        }

        .spec-val {
            font-weight: 600;
            color: var(--secondary);
        }

        .engine-visual {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
        }

        .engine-visual img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }

        /* 4. 核心功能矩阵 (6卡片) */
        .features-section {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-box {
            background: var(--bg-alabaster);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: var(--transition);
        }

        .feature-box:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }

        .feature-icon-bar {
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-size: 20px;
            margin-bottom: 20px;
            font-weight: bold;
        }

        .feature-box h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 12px;
        }

        .feature-box p {
            font-size: 14px;
            line-height: 1.65;
            color: var(--text-body);
        }

        /* 5. 热门设计方案与应用场景 */
        .solutions-section {
            background: var(--bg-alabaster);
        }

        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .solution-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .solution-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .solution-cover {
            height: 200px;
            position: relative;
        }

        .solution-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .solution-tag {
            position: absolute;
            top: 14px;
            right: 14px;
            background: rgba(22, 24, 29, 0.85);
            color: #FFFFFF;
            font-size: 12px;
            padding: 3px 10px;
            border-radius: 2px;
        }

        .solution-body {
            padding: 26px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .solution-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 10px;
        }

        .solution-body p {
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .solution-checklist {
            list-style: none;
            margin-bottom: 24px;
            font-size: 13px;
        }

        .solution-checklist li {
            padding: 6px 0;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .solution-checklist li::before {
            content: "•";
            color: var(--primary);
            font-size: 16px;
        }

        .solution-body .btn {
            margin-top: auto;
            width: 100%;
        }

        /* 6. 效能对比工作台 */
        .benchmark-section {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .benchmark-table-wrapper {
            background: var(--bg-alabaster);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
        }

        .benchmark-header-row {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            background: #252A34;
            color: #FFFFFF;
            font-weight: 700;
            font-size: 15px;
            padding: 16px 24px;
        }

        .benchmark-row {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            align-items: center;
            font-size: 14px;
            transition: var(--transition);
        }

        .benchmark-row:last-child {
            border-bottom: none;
        }

        .benchmark-row:hover {
            background: #F1EFEA;
        }

        .benchmark-feature {
            font-weight: 600;
            color: var(--secondary);
        }

        .benchmark-old {
            color: #A34848;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .benchmark-new {
            color: var(--success);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* 7. 深色沉浸式渲染案例 (Dark Mode Inset) */
        .gallery-section {
            background: var(--dark-inset);
            color: #E2E4E8;
            position: relative;
        }

        .gallery-section .section-title {
            color: #FFFFFF;
        }

        .gallery-section .section-desc {
            color: #9DA4B0;
        }

        .gallery-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr;
            gap: 24px;
        }

        .gallery-sub-grid {
            display: grid;
            grid-template-rows: 1fr 1fr;
            gap: 24px;
        }

        .gallery-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-dark);
            background: #1F232B;
        }

        .gallery-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .gallery-card:hover img {
            transform: scale(1.03);
        }

        .gallery-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(180deg, transparent 0%, rgba(10, 12, 16, 0.95) 100%);
            padding: 24px;
        }

        .gallery-overlay h3 {
            font-size: 18px;
            color: #FFFFFF;
            margin-bottom: 6px;
        }

        .gallery-meta {
            font-size: 13px;
            color: #B5BAC2;
            display: flex;
            gap: 16px;
        }

        /* 8. 软件版本演进里程碑 */
        .milestones-section {
            background: var(--bg-alabaster);
        }

        .timeline-container {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            padding: 20px 0;
        }

        .timeline-container::before {
            content: "";
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 2px;
            background: var(--border-color);
            transform: translateX(-50%);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            width: 50%;
            padding: 0 36px;
        }

        .timeline-item:nth-child(odd) {
            left: 0;
            text-align: right;
        }

        .timeline-item:nth-child(even) {
            left: 50%;
            text-align: left;
        }

        .timeline-dot {
            position: absolute;
            top: 8px;
            width: 14px;
            height: 14px;
            background: var(--primary);
            border-radius: 50%;
            border: 3px solid #FFFFFF;
            box-shadow: 0 0 0 2px var(--primary);
        }

        .timeline-item:nth-child(odd) .timeline-dot {
            right: -7px;
        }

        .timeline-item:nth-child(even) .timeline-dot {
            left: -7px;
        }

        .timeline-card {
            background: #FFFFFF;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
        }

        .timeline-version {
            font-size: 13px;
            color: var(--primary);
            font-weight: 700;
            margin-bottom: 4px;
        }

        .timeline-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 8px;
        }

        .timeline-desc {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
        }

        /* 9. 定制企业与设计工坊实战故事 */
        .stories-section {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .stories-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .story-card {
            background: var(--bg-alabaster);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .story-img {
            height: 220px;
        }

        .story-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .story-content {
            padding: 28px;
        }

        .story-quote {
            font-size: 15px;
            font-style: italic;
            color: var(--secondary);
            margin-bottom: 18px;
            line-height: 1.65;
            position: relative;
        }

        .story-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        .story-stat-num {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
        }

        .story-stat-label {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 10. 平台保障体系 */
        .trust-section {
            background: var(--bg-alabaster);
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .trust-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            text-align: left;
        }

        .trust-badge {
            width: 40px;
            height: 40px;
            background: #F4F6F8;
            color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-size: 18px;
            margin-bottom: 16px;
            font-weight: bold;
        }

        .trust-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 8px;
        }

        .trust-card p {
            font-size: 13px;
            color: var(--text-body);
            line-height: 1.6;
        }

        /* 11. 从业者口碑评价 */
        .testimonials-section {
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .testimonial-card {
            background: var(--bg-alabaster);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .testimonial-stars {
            color: #E29338;
            font-size: 14px;
            margin-bottom: 14px;
        }

        .testimonial-text {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-body);
            margin-bottom: 20px;
        }

        .testimonial-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .user-avatar {
            width: 42px;
            height: 42px;
            background: #DDD8CE;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--secondary);
        }

        .user-name {
            font-size: 14px;
            font-weight: 700;
            color: var(--secondary);
        }

        .user-role {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 12. 技术教程内嵌资讯 */
        .articles-section {
            background: var(--bg-alabaster);
; \n            padding: 20px;\n        }\n\n        .article {\n            margin-bottom: 20px;\n            border: 1px solid var(--border-color);\n            padding: 15px;\n            border-radius: 8px;\n        }\n\n        .article h2 {\n            margin-top: 0;\n        }\n\n        .article p {\n            line-height: 1.6;\n        }\n\n        .article a {\n            color: var(--link-color);\n            text-decoration: none;\n        }\n\n        .article a:hover {\n            text-decoration: underline;\n        }\n\n        footer {\n            text-align: center;\n            padding: 10px;\n            background-color: var(--bg-dark);\n            color: var(--text-light);\n            margin-top: 30px;\n            border-top: 1px solid var(--border-color);\n        }\n