/* roulang page: index */
:root {
      --primary-dark: #12161A;
      --accent-green: #00E599;
      --accent-green-hover: #00c784;
      --secondary-silver: #E8EDF2;
      --secondary-slate: #232A31;
      --bg-light: #F8FAFC;
      --bg-dark: #0D1117;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-sub: #94A3B8;
      --border-light: rgba(15, 23, 42, 0.08);
      --border-dark: rgba(255, 255, 255, 0.1);
      --card-radius: 6px;
      --shadow-subtle: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 12px 30px -4px rgba(0, 0, 0, 0.12);
      --transition-base: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition-base); }
    img { max-width: 100%; height: auto; display: block; }
    
    /* 容器与版式节奏 */
    .site-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .section-wrap {
      padding-top: 96px;
      padding-bottom: 96px;
      position: relative;
    }
    .section-wrap-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .section-wrap-alt {
      background-color: #FFFFFF;
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    
    /* 标题层级 */
    .section-header {
      margin-bottom: 56px;
      max-width: 820px;
    }
    .section-header.text-center {
      margin-left: auto;
      margin-right: auto;
    }
    .section-header h2 {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-wrap-dark .section-header h2 {
      color: #FFFFFF;
    }
    .section-header p {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 0;
    }
    .section-wrap-dark .section-header p {
      color: var(--text-sub);
    }
    .badge-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      background: rgba(0, 229, 153, 0.12);
      color: #009e66;
    }
    .section-wrap-dark .badge-tag {
      background: rgba(0, 229, 153, 0.2);
      color: var(--accent-green);
    }

    /* 按钮规范 */
    .btn-action-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--accent-green);
      color: var(--primary-dark);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 12px 28px;
      border-radius: 4px;
      border: 1px solid var(--accent-green);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(0, 229, 153, 0.25);
    }
    .btn-action-primary:hover, .btn-action-primary:focus {
      background-color: var(--accent-green-hover);
      color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 229, 153, 0.35);
    }
    .btn-action-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: transparent;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 12px 28px;
      border-radius: 4px;
      border: 1px solid rgba(15, 23, 42, 0.2);
      cursor: pointer;
    }
    .btn-action-secondary:hover, .btn-action-secondary:focus {
      background-color: var(--secondary-silver);
      border-color: var(--text-main);
      color: var(--text-main);
    }
    .btn-action-dark-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: transparent;
      color: #FFFFFF;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 12px 28px;
      border-radius: 4px;
      border: 1px solid var(--border-dark);
      cursor: pointer;
    }
    .btn-action-dark-outline:hover {
      background-color: rgba(255, 255, 255, 0.08);
      color: var(--accent-green);
      border-color: var(--accent-green);
    }

    /* 顶部通栏信息条与主导航 */
    .top-meta-bar {
      background-color: var(--primary-dark);
      color: #8E9BAE;
      font-size: 0.8rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .top-meta-bar .inner-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .header-navigation {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.01em;
    }
    .brand-logo-wrap svg {
      width: 32px;
      height: 32px;
      fill: var(--accent-green);
    }
    .main-nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      gap: 28px;
    }
    .main-nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
    }
    .main-nav-links li a:hover, .main-nav-links li a.active {
      color: var(--text-main);
    }
    .main-nav-links li a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-green);
      transition: var(--transition-base);
    }
    .main-nav-links li a:hover::after {
      width: 100%;
    }
    .nav-right-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* Hero 板块 */
    .hero-stage {
      background: linear-gradient(135deg, #101418 0%, #171E26 100%);
      color: #FFFFFF;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-stage::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 80% 20%, rgba(0, 229, 153, 0.12) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.02em;
      color: #FFFFFF;
    }
    .hero-content h1 span {
      color: var(--accent-green);
    }
    .hero-content .hero-desc {
      font-size: 1.1rem;
      color: #A0AEC0;
      line-height: 1.8;
      margin-bottom: 36px;
      max-width: 580px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-meta-points {
      display: flex;
      gap: 32px;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
    }
    .meta-point-item h4 {
      font-size: 1.5rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 4px;
      font-family: monospace;
    }
    .meta-point-item p {
      font-size: 0.85rem;
      color: #8E9BAE;
      margin: 0;
    }
    .hero-preview-box {
      position: relative;
      border-radius: var(--card-radius);
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    .hero-preview-box img {
      width: 100%;
      height: 440px;
      object-fit: cover;
    }
    .preview-badge-status {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(18, 22, 26, 0.85);
      backdrop-filter: blur(8px);
      padding: 16px;
      border-radius: 4px;
      border: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .preview-badge-status .status-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--accent-green);
      border-radius: 50%;
      margin-right: 8px;
    }

    /* 架构与技术介绍（#intro） */
    .intro-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 56px;
      align-items: center;
    }
    .intro-tech-list {
      margin-top: 28px;
      list-style: none;
    }
    .intro-tech-list li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    .intro-tech-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 10px;
      width: 12px;
      height: 2px;
      background: var(--accent-green);
    }
    .arch-display-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      overflow: hidden;
      box-shadow: var(--shadow-subtle);
    }
    .arch-display-card img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .arch-card-body {
      padding: 24px;
    }
    .arch-card-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .arch-card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin: 0;
    }

    /* 核心特性 6 网格（#features） */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-item-card {
      background: #FFFFFF;
      padding: 36px 30px;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-light);
      transition: var(--transition-base);
      position: relative;
    }
    .feature-item-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 229, 153, 0.4);
    }
    .feature-index {
      font-family: monospace;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--accent-green);
      margin-bottom: 16px;
    }
    .feature-item-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-item-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin: 0;
      line-height: 1.7;
    }

    /* 热门产品与解决方案（#products） */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-box {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition-base);
    }
    .product-box:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .product-thumb {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-box:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-details {
      padding: 28px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      font-size: 0.8rem;
      color: #009e66;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .product-details h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .product-details p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .spec-points {
      list-style: none;
      padding-top: 14px;
      border-top: 1px dashed var(--border-light);
      margin-bottom: 20px;
    }
    .spec-points li {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 6px;
      display: flex;
      justify-content: space-between;
    }

    /* 深色案例与理念（#solutions） */
    .dark-concept-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 64px;
      align-items: center;
    }
    .concept-points-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .matrix-box {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      padding: 24px;
      border-radius: var(--card-radius);
    }
    .matrix-box h4 {
      font-size: 1.05rem;
      color: var(--accent-green);
      margin-bottom: 8px;
    }
    .matrix-box p {
      font-size: 0.85rem;
      color: var(--text-sub);
      margin: 0;
      line-height: 1.6;
    }

    /* 标杆场景故事（#stories） */
    .story-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .story-item:last-child { margin-bottom: 0; }
    .story-item.reverse {
      grid-template-columns: 1fr 1fr;
      direction: rtl;
    }
    .story-item.reverse .story-text {
      direction: ltr;
    }
    .story-media {
      border-radius: var(--card-radius);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-subtle);
    }
    .story-media img {
      width: 100%;
      height: 320px;
      object-fit: cover;
    }
    .story-text h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .story-text p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .story-metrics-badge {
      display: inline-flex;
      background: var(--secondary-silver);
      padding: 8px 16px;
      border-radius: 4px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 运行指标条（#metrics） */
    .metrics-bar-wrap {
      background: var(--primary-dark);
      color: #FFFFFF;
      padding: 60px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-col h3 {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-green);
      margin-bottom: 4px;
      font-family: monospace;
      letter-spacing: -0.03em;
    }
    .metric-col p {
      font-size: 0.9rem;
      color: #94A3B8;
      margin: 0;
    }

    /* 用户与专家评价（#testimonials） */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      padding: 32px;
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-subtle);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote-mark {
      font-size: 2.5rem;
      line-height: 1;
      color: var(--accent-green);
      font-family: serif;
      margin-bottom: 12px;
    }
    .testimonial-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 24px;
      flex-grow: 1;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-avatar-initial {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--secondary-silver);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary-dark);
      font-size: 1rem;
    }
    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      margin: 0;
    }
    .user-info span {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* 行业洞察与新闻（#news） */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .news-card-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-subtle);
      transition: var(--transition-base);
    }
    .news-card-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }
    .news-card-thumb {
      height: 190px;
      overflow: hidden;
    }
    .news-card-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-card-info {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--text-sub);
      margin-bottom: 8px;
    }
    .news-card-info h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-card-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin: 0;
    }

    /* FAQ 手风琴（#faq） */
    .faq-container-narrow {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--card-radius);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-trigger {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      user-select: none;
    }
    .faq-trigger:hover {
      background: #FAFAFA;
    }
    .faq-icon-arrow {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--text-sub);
    }
    .faq-accordion-item.active .faq-icon-arrow {
      transform: rotate(45deg);
      color: var(--accent-green);
    }
    .faq-content-body {
      padding: 0 24px 20px;
      display: none;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.75;
      border-top: 1px solid #F1F5F9;
      margin-top: 4px;
      padding-top: 16px;
    }
    .faq-accordion-item.active .faq-content-body {
      display: block;
    }

    /* 底端转化收口（#bottom-cta） */
    .cta-finish-wrap {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      text-align: center;
      padding: 88px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .cta-finish-box {
      max-width: 760px;
      margin: 0 auto;
    }
    .cta-finish-box h2 {
      font-size: 2.4rem;
      font-weight: 800;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .cta-finish-box p {
      font-size: 1.1rem;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 36px;
    }
    .cta-finish-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 页脚系统 */
    .site-footer {
      background: #0B0E11;
      color: #8E9BAE;
      font-size: 0.88rem;
      padding-top: 72px;
      padding-bottom: 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .footer-columns-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .footer-col p {
      line-height: 1.7;
      margin-bottom: 12px;
      color: #8E9BAE;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list li a {
      color: #8E9BAE;
    }
    .footer-links-list li a:hover {
      color: var(--accent-green);
    }
    .footer-bottom-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
    }
    .footer-bottom-bar a {
      color: #8E9BAE;
    }
    .footer-bottom-bar a:hover {
      color: #FFFFFF;
    }

    /* 移动端与响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .intro-grid { grid-template-columns: 1fr; gap: 40px; }
      .dark-concept-grid { grid-template-columns: 1fr; gap: 40px; }
      .features-grid, .products-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
      .footer-columns-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
    }

    @media (max-width: 768px) {
      .top-meta-bar { display: none; }
      .main-nav-links { display: none; }
      .nav-container { height: 64px; }
      .section-wrap { padding-top: 64px; padding-bottom: 64px; }
      .hero-content h1 { font-size: 2.2rem; }
      .features-grid, .products-grid, .testimonials-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .concept-points-matrix { grid-template-columns: 1fr; }
      .story-item, .story-item.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: 28px;
      }
      .story-item.reverse .story-text { direction: ltr; }
      .footer-columns-grid { grid-template-columns: 1fr; gap: 32px; }
      .footer-bottom-bar { flex-direction: column; text-align: center; }
    }