/* roulang page: index */
:root {
      --bg-dark: #0A0F1D;
      --bg-card: rgba(30, 41, 59, 0.72);
      --bg-card-hover: rgba(30, 41, 59, 0.9);
      --primary: #2563EB;
      --primary-hover: #1D4ED8;
      --cyan-light: #38BDF8;
      --cyan-accent: #06B6D4;
      --purple-vip: #818CF8;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --border-line: rgba(56, 189, 248, 0.16);
      --border-line-hover: rgba(56, 189, 248, 0.42);
      --glow-blue: 0 0 25px rgba(37, 99, 235, 0.45);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    body {
      background-color: var(--bg-dark);
      background-image: radial-gradient(circle at 15% 15%, rgba(37, 99, 235, 0.12) 0%, transparent 40%),
                        radial-gradient(circle at 85% 65%, rgba(6, 182, 212, 0.08) 0%, transparent 45%);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 15, 29, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-line);
      transition: var(--transition);
    }
    .top-bar {
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 13px;
      color: var(--text-dim);
      padding: 6px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .version-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--cyan-light);
    }
    .version-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--cyan-accent);
      box-shadow: 0 0 8px var(--cyan-accent);
    }
    .main-nav {
      padding: 14px 0;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.02em;
    }
    .logo-badge {
      background: linear-gradient(135deg, var(--primary), var(--cyan-accent));
      width: 36px;
      height: 36px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: #fff;
      box-shadow: 0 0 15px rgba(37, 99, 235, 0.6);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-muted);
      transition: var(--transition);
      font-weight: 500;
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--text-main);
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan-light);
      border-radius: 2px;
      box-shadow: 0 0 8px var(--cyan-light);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--primary), #1D4ED8);
      color: #FFF;
      box-shadow: var(--glow-blue);
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(56, 189, 248, 0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: rgba(30, 41, 59, 0.6);
      border-color: var(--border-line);
      color: var(--text-main);
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      border-color: var(--cyan-light);
      background: rgba(30, 41, 59, 0.9);
      color: var(--cyan-light);
      transform: translateY(-2px);
    }

    /* 全局板块间距与排版 */
    section {
      padding: 85px 0;
      position: relative;
    }
    .section-alt {
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.6) 0%, rgba(10, 15, 29, 0.8) 100%);
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }
    .section-header {
      margin-bottom: 48px;
      max-width: 820px;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--cyan-light);
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 12px;
      background: rgba(56, 189, 248, 0.1);
      padding: 4px 12px;
      border-radius: 20px;
      border: 1px solid rgba(56, 189, 248, 0.2);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 16px;
      background: linear-gradient(180deg, #FFFFFF 20%, #CBD5E1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 16px;
      line-height: 1.8;
    }

    /* 玻璃卡片基类 */
    .glass-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--border-line-hover);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
    }

    /* 01. 斜切 Hero */
    .hero-section {
      padding: 80px 0 110px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    h1.hero-title {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
      background: linear-gradient(180deg, #FFFFFF 30%, #94A3B8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      color: var(--text-muted);
      font-size: 16px;
      line-height: 1.8;
      margin-bottom: 34px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border-line);
      padding-top: 24px;
    }
    .kpi-item h4 {
      font-size: 24px;
      font-weight: 700;
      color: var(--cyan-light);
      margin-bottom: 4px;
    }
    .kpi-item p {
      font-size: 13px;
      color: var(--text-dim);
    }
    .hero-media {
      position: relative;
      transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
      transition: var(--transition);
    }
    .hero-media:hover {
      transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
    }
    .hero-media-wrapper {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(56, 189, 248, 0.3);
      box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 30px rgba(37, 99, 235, 0.25);
      background: #111827;
    }
    .hero-media-img {
      width: 100%;
      height: 480px;
      object-fit: cover;
    }
    .floating-chip {
      position: absolute;
      bottom: 24px;
      left: 24px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-sm);
      padding: 14px 20px;
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* 02. 资料目录 */
    .catalog-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .catalog-item {
      padding: 24px;
      background: rgba(15, 23, 42, 0.5);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      transition: var(--transition);
    }
    .catalog-item:hover {
      border-color: var(--cyan-light);
      background: rgba(30, 41, 59, 0.8);
      transform: translateY(-3px);
    }
    .catalog-number {
      font-size: 14px;
      font-weight: 700;
      color: var(--cyan-accent);
      margin-bottom: 10px;
    }
    .catalog-item h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }
    .catalog-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 03. 核心优势价值点 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .value-card h3 {
      font-size: 20px;
      margin: 16px 0 10px;
      color: #FFF;
    }
    .value-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .value-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(37, 99, 235, 0.15);
      border: 1px solid rgba(56, 189, 248, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyan-light);
      font-weight: 700;
      font-size: 20px;
    }

    /* 04. 关键图表与硬核技术 */
    .chart-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .metric-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 16px;
    }
    .metric-table tr {
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .metric-table td {
      padding: 16px 8px;
      font-size: 15px;
    }
    .metric-table td:last-child {
      text-align: right;
      font-weight: 600;
      color: var(--cyan-light);
    }

    /* 05. 进阶套件 */
    .suite-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .suite-card ul {
      list-style: none;
      margin-top: 20px;
    }
    .suite-card li {
      position: relative;
      padding-left: 20px;
      margin-bottom: 12px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .suite-card li::before {
      content: '✔';
      position: absolute;
      left: 0;
      color: var(--cyan-accent);
      font-size: 12px;
    }

    /* 06. 云边端软硬件协同 */
    .arch-panel {
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.7));
      border: 1px solid var(--border-line);
      padding: 40px;
      position: relative;
      overflow: hidden;
    }
    .arch-nodes {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
      position: relative;
      z-index: 2;
    }
    .arch-node {
      background: rgba(10, 15, 29, 0.7);
      padding: 24px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.06);
    }
    .arch-node h4 {
      font-size: 16px;
      color: var(--cyan-light);
      margin-bottom: 8px;
    }
    .arch-node p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 07. 垂直使用场景 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      display: flex;
      flex-direction: column;
    }
    .scenario-card img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }
    .scenario-body {
      padding: 22px;
      flex-grow: 1;
    }
    .scenario-body h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: #FFF;
    }
    .scenario-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 08. 交互闭环走查步骤 */
    .step-track {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      position: relative;
      padding: 24px;
      border-radius: var(--radius-md);
      background: rgba(30, 41, 59, 0.5);
      border: 1px solid var(--border-line);
    }
    .step-badge {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 16px;
      box-shadow: 0 0 12px rgba(37, 99, 235, 0.8);
    }
    .step-item h3 {
      font-size: 17px;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 09. 关键数据条 */
    .metrics-strip {
      background: linear-gradient(90deg, rgba(37, 99, 235, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 40px;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .strip-item h3 {
      font-size: 38px;
      font-weight: 800;
      color: #FFF;
      letter-spacing: -0.02em;
      margin-bottom: 6px;
    }
    .strip-item p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 10. 案例实证 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--bg-card);
      border: 1px solid var(--border-line);
    }
    .case-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .case-content {
      padding: 28px;
    }
    .case-tag {
      font-size: 12px;
      background: rgba(129, 140, 248, 0.15);
      color: var(--purple-vip);
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-content h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .case-content p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .case-stats {
      display: flex;
      gap: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 14px;
      font-size: 13px;
      color: var(--cyan-light);
    }

    /* 11. 用户口碑评价墙 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .quote-box {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 20px;
      position: relative;
    }
    .user-profile {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #1E293B, #334155);
      border: 1px solid var(--border-line);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--cyan-light);
    }
    .user-info h4 {
      font-size: 15px;
      color: #FFF;
    }
    .user-info span {
      font-size: 12px;
      color: var(--text-dim);
    }

    /* 12. 部署模式矩阵 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }
    .pricing-card {
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .pricing-card.featured {
      border-color: var(--cyan-light);
      box-shadow: 0 0 35px rgba(56, 189, 248, 0.2);
      background: rgba(30, 41, 59, 0.85);
    }
    .pricing-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--primary);
      font-size: 11px;
      padding: 3px 10px;
      border-radius: 12px;
      color: #FFF;
      font-weight: 600;
    }
    .price-value {
      font-size: 28px;
      font-weight: 800;
      color: var(--cyan-light);
      margin: 16px 0;
    }
    .feature-list {
      list-style: none;
      margin: 20px 0;
      font-size: 14px;
      color: var(--text-muted);
    }
    .feature-list li {
      margin-bottom: 10px;
      padding-left: 20px;
      position: relative;
    }
    .feature-list li::before {
      content: '•';
      position: absolute;
      left: 0;
      color: var(--cyan-light);
      font-size: 18px;
    }

    /* 13. 运营资讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-dim);
      margin-bottom: 8px;
    }
    .news-card h3 {
      font-size: 17px;
      margin-bottom: 12px;
      line-height: 1.5;
    }
    .news-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .news-link {
      font-size: 13px;
      color: var(--cyan-light);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 14. FAQ 手风琴 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 22px 28px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 17px;
      font-weight: 600;
      user-select: none;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--cyan-light);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 28px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.8;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 0 28px 24px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 15. 终极转化区 */
    .conversion-box {
      border-radius: var(--radius-lg);
      background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.3) 0%, rgba(15, 23, 42, 0.95) 75%);
      border: 1px solid rgba(56, 189, 248, 0.3);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(37, 99, 235, 0.2);
      padding: 56px 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .conversion-info h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .conversion-info p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .form-box {
      background: rgba(10, 15, 29, 0.6);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 30px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      margin-bottom: 6px;
      color: var(--text-muted);
    }
    .form-input {
      width: 100%;
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      color: #FFF;
      font-size: 14px;
      transition: var(--transition);
      outline: none;
    }
    .form-input:focus {
      border-color: var(--cyan-light);
      box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
    }
    .form-btn {
      width: 100%;
      padding: 14px;
      font-size: 15px;
    }

    /* 全局页脚 */
    .site-footer {
      background: #060913;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      font-size: 18px;
      color: #FFF;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.8;
      max-width: 320px;
    }
    .footer-col h4 {
      font-size: 15px;
      color: #FFF;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--cyan-light);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      text-align: center;
      font-size: 12px;
      color: var(--text-dim);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .catalog-grid, .scenario-grid, .step-track, .arch-nodes {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-media {
        transform: none;
      }
      .hero-media-img {
        height: 320px;
      }
      .value-grid, .suite-grid, .pricing-grid, .news-grid, .testimonial-grid, .cases-grid, .conversion-box {
        grid-template-columns: 1fr;
      }
      .chart-layout {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .section-title {
        font-size: 26px;
      }
      h1.hero-title {
        font-size: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }