/* roulang page: index */
:root {
      --primary: #0066FF;
      --primary-dark: #004edb;
      --accent: #00E599;
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --dark-surface: #0B132B;
      --dark-card: #132247;
      --text: #0F172A;
      --text-muted: #64748B;
      --text-body: #334155;
      --border: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.12);
      --radius: 12px;
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 20px 30px -10px rgba(0, 102, 255, 0.15);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
    }
    body {
      overflow-x: hidden;
      padding-bottom: 74px;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--primary);
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 40px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 14px rgba(0, 102, 255, 0.35);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: #FFFFFF;
      color: var(--text);
      border-color: var(--border);
    }
    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-accent {
      background: var(--accent);
      color: #04291e;
      font-weight: 700;
    }
    .btn-accent:hover {
      opacity: 0.9;
      transform: translateY(-2px);
    }

    /* Header Nav */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      font-size: 19px;
      font-weight: 800;
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 16px;
    }
    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
    }
    .nav-menu a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-body);
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    /* Sections Shared */
    section {
      padding: 80px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    /* 1. Hero */
    #hero {
      position: relative;
      background: radial-gradient(circle at 10% 20%, rgba(0, 102, 255, 0.08) 0%, rgba(248, 250, 252, 0.6) 80%), url('/assets/images/26983f0203b3d8c6.jpg') center/cover no-repeat;
      padding: 100px 0 90px;
    }
    .hero-mask {
      position: absolute;
      inset: 0;
      background: linear-gradient(to right, rgba(248, 250, 252, 0.97) 35%, rgba(248, 250, 252, 0.85) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-text {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-body);
      margin-bottom: 30px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border);
      padding-top: 24px;
    }
    .kpi-num {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
    }
    .kpi-lbl {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 2px;
    }
    .hero-device-card {
      background: #0B132B;
      color: #fff;
      border-radius: 20px;
      padding: 24px;
      box-shadow: 0 25px 50px -12px rgba(11, 19, 43, 0.4);
      border: 1px solid rgba(255, 255, 255, 0.1);
      position: relative;
      overflow: hidden;
    }
    .stream-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border-dark);
      font-size: 13px;
      color: var(--accent);
    }
    .stream-item {
      padding: 14px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-family: monospace;
      font-size: 12px;
      line-height: 1.6;
    }
    .stream-tag {
      display: inline-block;
      padding: 2px 6px;
      border-radius: 4px;
      background: rgba(0, 229, 153, 0.15);
      color: var(--accent);
      margin-right: 6px;
    }

    /* 2. Intro */
    #intro { background: #FFFFFF; }
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 24px;
      font-size: 14px;
    }
    .spec-table th, .spec-table td {
      padding: 12px 14px;
      border-bottom: 1px solid var(--border);
      text-align: left;
    }
    .spec-table th {
      color: var(--text-muted);
      width: 35%;
      font-weight: 600;
    }
    .spec-table td {
      color: var(--text);
      font-weight: 600;
    }

    /* 3. Advantages */
    #advantages { background: #F8FAFC; }
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--border);
      transition: all 0.3s;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 102, 255, 0.3);
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .adv-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 10px;
    }
    .adv-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 4. Products */
    #products { background: #FFFFFF; }
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .prod-card {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 34px 28px;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .prod-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-lg);
    }
    .prod-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 99px;
    }
    .prod-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--text);
      margin-bottom: 8px;
    }
    .prod-tagline {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 24px;
      min-height: 38px;
    }
    .prod-features {
      list-style: none;
      margin-bottom: 30px;
      flex-grow: 1;
    }
    .prod-features li {
      font-size: 14px;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 1px dashed var(--border);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .prod-features li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 900;
    }

    /* 5. Dark Case */
    #dark-case {
      background: var(--dark-surface);
      color: #FFFFFF;
    }
    #dark-case .section-title { color: #FFFFFF; }
    #dark-case .section-desc { color: #94A3B8; }
    .case-container {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .case-screen {
      background: var(--dark-card);
      border-radius: 16px;
      padding: 24px;
      border: 1px solid var(--border-dark);
    }
    .case-live-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-dark);
    }
    .case-metrics-group {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .case-card-inner {
      background: rgba(255, 255, 255, 0.03);
      padding: 16px;
      border-radius: 8px;
      border: 1px solid var(--border-dark);
    }
    .case-card-inner h4 {
      font-size: 14px;
      color: var(--accent);
      margin-bottom: 6px;
    }
    .case-card-inner p {
      font-size: 13px;
      color: #CBD5E1;
      line-height: 1.6;
    }

    /* 6. Use Cases */
    #use-cases { background: #FFFFFF; }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .scenario-card {
      display: flex;
      gap: 20px;
      padding: 26px;
      background: #F8FAFC;
      border-radius: var(--radius);
      border: 1px solid var(--border);
    }
    .scenario-thumb {
      width: 140px;
      height: 110px;
      flex-shrink: 0;
      border-radius: 8px;
      overflow: hidden;
    }
    .scenario-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-info h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 6px;
    }
    .scenario-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 10px;
    }
    .scenario-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
    }

    /* 7. Metrics */
    #metrics {
      background: linear-gradient(135deg, #0052cc 0%, #0066FF 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .m-num {
      font-size: 40px;
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .m-label {
      font-size: 14px;
      color: rgba(255, 255, 255, 0.85);
    }

    /* 8. Testimonials */
    #testimonials { background: #F8FAFC; }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #FFFFFF;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
    }
    .review-score {
      color: #FFB800;
      font-size: 14px;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .review-author {
      font-size: 13px;
      font-weight: 700;
      color: var(--text);
    }
    .review-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. News Insights */
    #news-insights { background: #FFFFFF; }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
    }
    .news-card-img {
      height: 160px;
      overflow: hidden;
    }
    .news-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .news-card:hover .news-card-img img {
      transform: scale(1.04);
    }
    .news-body {
      padding: 20px;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 10. FAQ */
    #faq { background: #F8FAFC; }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-q {
      padding: 18px 22px;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
    }
    .faq-a {
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 11. Security Guarantee */
    #security-guarantee {
      background: #FFFFFF;
      padding: 50px 0;
    }
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 16px;
      background: #F8FAFC;
      border-radius: 10px;
      border: 1px solid var(--border);
    }
    .guarantee-badge-icon {
      width: 40px;
      height: 40px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }
    .guarantee-txt h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text);
    }
    .guarantee-txt p {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* 12. Final CTA */
    #cta {
      background: radial-gradient(circle at center, #0B132B 0%, #050914 100%);
      color: #FFFFFF;
      text-align: center;
      padding: 90px 0;
    }
    .cta-box {
      max-width: 720px;
      margin: 0 auto;
    }
    .cta-title {
      font-size: 34px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .cta-desc {
      font-size: 15px;
      color: #94A3B8;
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      max-width: 520px;
      margin: 0 auto 16px;
    }
    .cta-input {
      flex-grow: 1;
      padding: 14px 18px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      font-size: 14px;
      outline: none;
    }
    .cta-input:focus {
      border-color: var(--accent);
    }
    .cta-tip {
      font-size: 12px;
      color: #64748B;
    }

    /* Footer */
    footer.site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 12px;
    }
    .footer-brand p {
      line-height: 1.7;
      max-width: 320px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
    }

    /* Floating Bar */
    .floating-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 64px;
      background: rgba(11, 19, 43, 0.94);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      z-index: 99;
      display: flex;
      align-items: center;
    }
    .floating-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .floating-info {
      color: #FFFFFF;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .floating-badge {
      background: rgba(0, 229, 153, 0.15);
      color: var(--accent);
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 11px;
      font-weight: 700;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-content, .intro-grid, .case-container {
        grid-template-columns: 1fr;
      }
      .adv-grid, .product-grid, .review-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .adv-grid, .product-grid, .review-grid, .news-grid, .scenario-grid, .metrics-bar, .guarantee-bar {
        grid-template-columns: 1fr;
      }
      .hero-title { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
      .floating-info { font-size: 12px; }
      .cta-form { flex-direction: column; }
    }