/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0A192F;
      --primary-light: #2A85FF;
      --accent: #00A896;
      --accent-soft: rgba(0, 168, 150, 0.08);
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 30px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 16px 38px rgba(15, 76, 129, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1240px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.68;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea, select {
      font-family: inherit;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-wrap {
      padding: 92px 0;
      position: relative;
    }
    .section-wrap.bg-alt {
      background-color: #F1F5F9;
    }
    .section-wrap.bg-white {
      background-color: #FFFFFF;
    }
    .section-wrap.bg-dark {
      background-color: var(--primary-dark);
      color: #E2E8F0;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      letter-spacing: 0.5px;
      background-color: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      border: 1px solid rgba(15, 76, 129, 0.16);
      margin-bottom: 16px;
    }
    .badge-teal {
      background-color: var(--accent-soft);
      color: #007A6D;
      border-color: rgba(0, 168, 150, 0.22);
    }
    .badge-dark {
      background-color: rgba(42, 133, 255, 0.15);
      color: #60A5FA;
      border-color: rgba(42, 133, 255, 0.35);
    }
    .section-head {
      margin-bottom: 54px;
      max-width: 780px;
    }
    .section-head.center {
      text-align: center;
      margin-left: auto;
      margin-right: auto;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-wrap.bg-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.75;
    }
    .section-wrap.bg-dark .section-desc {
      color: #94A3B8;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      gap: 8px;
      box-shadow: var(--shadow-sm);
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background-color: #0c3c66;
      box-shadow: 0 8px 24px rgba(15, 76, 129, 0.25);
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background-color: #008f80;
      box-shadow: 0 8px 24px rgba(0, 168, 150, 0.28);
      transform: translateY(-2px);
    }
    .btn-white {
      background-color: #FFFFFF;
      color: var(--primary-dark);
    }
    .btn-white:hover {
      background-color: #F8FAFC;
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
    }
    .btn-outline {
      border-color: rgba(255, 255, 255, 0.35);
      color: #FFFFFF;
      background: transparent;
    }
    .btn-outline:hover {
      border-color: #FFFFFF;
      background-color: rgba(255, 255, 255, 0.08);
      transform: translateY(-2px);
    }
    .card-base {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card-base:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(42, 133, 255, 0.35);
    }

    /* TopBar & Header */
    .topbar {
      background: #0A192F;
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-left, .topbar-right {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .topbar-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #38BDF8;
    }
    .site-header {
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid rgba(226, 232, 240, 0.85);
      transition: var(--transition);
    }
    .header-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 21px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-mark {
      width: 38px;
      height: 38px;
      border-radius: 9px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-size: 19px;
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.28);
    }
    .site-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .site-nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .site-nav a:hover, .site-nav a.active {
      color: var(--primary);
    }
    .site-nav a.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      font-size: 22px;
      color: var(--text-main);
    }

    /* Hero Video Official Visual */
    .hero-section {
      position: relative;
      background-color: #0A192F;
      color: #FFFFFF;
      padding: 120px 0 110px 0;
      overflow: hidden;
    }
    .hero-bg-cover {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.26;
      filter: saturate(1.1) brightness(0.7);
      pointer-events: none;
    }
    .hero-overlay-mask {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 68% 42%, rgba(42, 133, 255, 0.22) 0%, rgba(10, 25, 47, 0.94) 75%);
    }
    .hero-wrapper {
      position: relative;
      z-index: 2;
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-video-trigger {
      display: inline-flex;
      align-items: center;
      gap: 14px;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(8px);
      padding: 7px 22px 7px 10px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.18);
      margin-bottom: 28px;
      color: #E2E8F0;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
    }
    .hero-video-trigger:hover {
      background: rgba(255, 255, 255, 0.16);
      transform: scale(1.02);
    }
    .play-circle {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: #2A85FF;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 12px;
      box-shadow: 0 0 16px rgba(42, 133, 255, 0.6);
    }
    .hero-h1 {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.8px;
    }
    .hero-h1 span {
      background: linear-gradient(120deg, #FFFFFF 30%, #38BDF8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 17px;
      line-height: 1.82;
      color: #CBD5E1;
      margin-bottom: 38px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      margin-bottom: 52px;
    }
    .hero-badges-row {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 28px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      color: #94A3B8;
      font-size: 13px;
    }
    .hero-badges-row span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Modal for Video preview */
    .modal-backdrop {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(10, 25, 47, 0.85);
      z-index: 2000;
      backdrop-filter: blur(6px);
      align-items: center;
      justify-content: center;
      padding: 20px;
    }
    .modal-backdrop.active {
      display: flex;
    }
    .modal-box {
      background: #0F172A;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.15);
      max-width: 720px;
      width: 100%;
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    .modal-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      color: #fff;
    }
    .modal-content {
      padding: 24px;
      text-align: center;
      color: #CBD5E1;
    }

    /* Coupons Wall / Benefit */
    .coupon-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 16px;
    }
    .coupon-card {
      background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFC 100%);
      border: 1px dashed #CBD5E1;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .coupon-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .coupon-value {
      font-size: 34px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .coupon-value small {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-muted);
    }
    .coupon-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .coupon-rule {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .coupon-btn {
      width: 100%;
      padding: 10px;
      font-size: 14px;
      border-radius: 6px;
      background: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      border: 1px solid rgba(15, 76, 129, 0.18);
      font-weight: 600;
      cursor: pointer;
      text-align: center;
      transition: var(--transition);
    }
    .coupon-btn:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    /* Global Reach Section */
    .global-stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .global-stat-card {
      background: #FFFFFF;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: var(--transition);
    }
    .global-stat-card:hover {
      border-color: var(--primary-light);
    }
    .global-num {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .global-num span {
      font-size: 20px;
      color: var(--accent);
      margin-left: 2px;
    }
    .global-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .global-sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Architecture / Middle Platform */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 54px;
      align-items: center;
    }
    .arch-visual {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .arch-visual img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .arch-tag-float {
      position: absolute;
      bottom: 24px;
      left: 24px;
      background: rgba(10, 25, 47, 0.88);
      backdrop-filter: blur(8px);
      padding: 14px 22px;
      border-radius: var(--radius-sm);
      color: #fff;
      border-left: 4px solid #00A896;
    }
    .arch-feature-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .arch-item {
      display: flex;
      gap: 16px;
    }
    .arch-icon {
      flex-shrink: 0;
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--accent-soft);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 17px;
    }
    .arch-item h4 {
      font-size: 17px;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .arch-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Advantage Matrix (6 Cards) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .matrix-card {
      padding: 32px 28px;
    }
    .matrix-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: #EFF6FF;
      color: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .matrix-card h3 {
      font-size: 19px;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .matrix-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Scenario Solutions (3 Large Cards) */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .solution-card {
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }
    .solution-img {
      height: 200px;
      position: relative;
      overflow: hidden;
    }
    .solution-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .solution-card:hover .solution-img img {
      transform: scale(1.05);
    }
    .solution-body {
      padding: 30px 26px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .solution-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 14px;
    }
    .solution-tags span {
      font-size: 12px;
      padding: 3px 10px;
      background: #F1F5F9;
      color: #475569;
      border-radius: 4px;
    }
    .solution-body h3 {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .solution-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .solution-link {
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Comparison Table: Our SaaS vs Legacy */
    .compare-container {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .compare-table th {
      background: #F8FAFC;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .col-target {
      background: rgba(15, 76, 129, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .col-dim {
      color: #64748B;
    }

    /* Dark Security Section */
    .security-inner {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .security-points {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .sec-point-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 24px 20px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .sec-point-box:hover {
      background: rgba(255, 255, 255, 0.09);
      border-color: rgba(42, 133, 255, 0.4);
    }
    .sec-point-box h4 {
      color: #38BDF8;
      font-size: 16px;
        }
        .sec-point-box p {
          color: #fff;
          font-size: 14px;
          line-height: 24px;
          margin-bottom: 20px;
        }
        .sec-point-box ul {
          padding-left: 20px;
        }
        .sec-point-box ul li {
          color: #fff;
          font-size: 14px;
          line-height: 24px;
        }
        .sec-point-box ul li::marker {
          color: #38BDF8;
        }
        .btn-blue {
          background-color: #38BDF8;
          color: #fff;
          padding: 10px 20px;
          border-radius: 5px;
          text-decoration: none;
          display: inline-block;
        }
        .btn-blue:hover {
          background-color: #1E90FF;
        }
        .img-container {
          position: relative;
          width: 100%;
          height: 0;
          padding-bottom: 56.25%; /* 16:9 aspect ratio */
        }
        .img-container img {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          object-fit: cover;
        }
      }
      /* Optional: Media query for smaller screens */
      @media (max-width: 768px) {
        .sec-point-box {
          margin-bottom: 30px;
        }
      }