/* roulang page: index */
:root {
      --primary: #4F46E5;
      --primary-hover: #4338CA;
      --primary-light: #EEF2FF;
      --secondary: #6366F1;
      --accent: #10B981;
      --amber: #F59E0B;
      --dark: #0F172A;
      --dark-card: #1E293B;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --bg-body: #F8FAFC;
      --card-border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-pill: 9999px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 35px -5px rgba(79, 70, 229, 0.15);
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 90px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-body);
      line-height: 1.75;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    /* Top Utility Bar */
    .top-utility-bar {
      background-color: #0B0F19;
      color: #94A3B8;
      font-size: 0.85rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .status-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      margin-right: 6px;
    }

    /* Main Sticky Nav */
    .site-nav {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--card-border);
      transition: all 0.3s ease;
    }
    .nav-brand-logo {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .nav-brand-logo i {
      font-size: 1.6rem;
      color: var(--primary);
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-main);
      padding: 0.5rem 1rem !important;
      border-radius: var(--radius-sm);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
      background-color: var(--primary-light);
    }
    .nav-dropdown-menu {
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
      border-radius: var(--radius-md);
      padding: 0.75rem;
      min-width: 220px;
    }
    .nav-dropdown-item {
      padding: 0.6rem 1rem;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .nav-dropdown-item:hover {
      background-color: var(--primary-light);
      color: var(--primary);
    }

    /* Buttons */
    .btn-brand-primary {
      background-color: var(--primary);
      color: #fff;
      border-radius: var(--radius-pill);
      padding: 0.65rem 1.65rem;
      font-weight: 600;
      border: 1px solid var(--primary);
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
      transition: all 0.25s ease;
    }
    .btn-brand-primary:hover {
      background-color: var(--primary-hover);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    }
    .btn-brand-outline {
      border: 1px solid var(--card-border);
      color: var(--text-main);
      background-color: #fff;
      border-radius: var(--radius-pill);
      padding: 0.65rem 1.65rem;
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-brand-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }

    /* Headings & Section Standard */
    .section-py {
      padding: 5.5rem 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--dark);
      margin-bottom: 1rem;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 760px;
      margin: 0 auto 3rem auto;
      line-height: 1.7;
    }
    .badge-pill-soft {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--primary-light);
      color: var(--primary);
      padding: 0.35rem 0.95rem;
      border-radius: var(--radius-pill);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    /* Section 1: Hero Bento */
    .hero-bento {
      padding: 3rem 0 5rem 0;
      background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.08) 0%, rgba(248, 250, 252, 0) 70%);
    }
    .bento-main-card {
      background: linear-gradient(135deg, #111827 0%, #1E1B4B 100%);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 3.5rem;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .bento-main-card::before {
      content: "";
      position: absolute;
      top: -100px;
      right: -100px;
      width: 360px;
      height: 360px;
      background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
      filter: blur(50px);
    }
    .bento-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 1.5rem;
      letter-spacing: -0.8px;
    }
    .bento-lead {
      color: #CBD5E1;
      font-size: 1.1rem;
      line-height: 1.8;
      margin-bottom: 2.2rem;
      max-width: 580px;
    }
    .bento-side-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      height: 100%;
      transition: all 0.3s ease;
    }
    .bento-side-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.3);
    }
    .bento-cta-bar {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 1.5rem 2rem;
      margin-top: 1.8rem;
      box-shadow: var(--shadow-sm);
    }

    /* Section 2: Search & Fast Filter */
    .filter-search-box {
      background: #FFFFFF;
      border: 2px solid #EEF2FF;
      border-radius: var(--radius-pill);
      padding: 0.5rem 0.5rem 0.5rem 1.5rem;
      display: flex;
      align-items: center;
      box-shadow: var(--shadow-sm);
    }
    .filter-search-input {
      border: none;
      outline: none;
      width: 100%;
      font-size: 1rem;
      color: var(--text-main);
    }
    .filter-tag-item {
      padding: 0.45rem 1.1rem;
      border-radius: var(--radius-pill);
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      font-size: 0.88rem;
      font-weight: 500;
      color: var(--text-muted);
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .filter-tag-item:hover, .filter-tag-item.active {
      background: var(--primary);
      color: #FFFFFF;
      border-color: var(--primary);
    }

    /* Section 3: Classification Matrix */
    .cat-matrix-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      text-align: center;
      transition: all 0.3s ease;
      height: 100%;
    }
    .cat-matrix-card:hover {
      border-color: var(--primary);
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .cat-matrix-icon {
      width: 60px;
      height: 60px;
      line-height: 60px;
      border-radius: 16px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 1.8rem;
      margin: 0 auto 1.25rem auto;
    }

    /* Section 4: Featured Showcase */
    .game-featured-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .game-featured-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.4);
    }
    .game-thumb-wrapper {
      position: relative;
      height: 220px;
      overflow: hidden;
      background-color: #0F172A;
    }
    .game-thumb-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .game-featured-card:hover .game-thumb-wrapper img {
      transform: scale(1.06);
    }
    .game-tag-float {
      position: absolute;
      top: 12px;
      right: 12px;
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(6px);
      color: #fff;
      font-size: 0.75rem;
      padding: 0.25rem 0.65rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }
    .game-fps-spec {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: rgba(16, 185, 129, 0.9);
      color: #fff;
      font-size: 0.75rem;
      padding: 0.2rem 0.6rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }

    /* Section 5: Metrics Strip */
    .metrics-bar-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      text-align: center;
      box-shadow: var(--shadow-sm);
      height: 100%;
    }
    .metrics-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 0.5rem;
      font-feature-settings: "tnum";
    }

    /* Section 6: Architecture / Dark Immersion */
    .dark-immersion-section {
      background: linear-gradient(180deg, #0B0F19 0%, #111827 100%);
      color: #F1F5F9;
    }
    .glass-card-dark {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 2.2rem;
      backdrop-filter: blur(8px);
      height: 100%;
      transition: all 0.3s ease;
    }
    .glass-card-dark:hover {
      border-color: var(--secondary);
      background: rgba(255, 255, 255, 0.07);
      transform: translateY(-4px);
    }

    /* Section 7: Multi Screen Scenarios */
    .scenario-item-box {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2.2rem;
      margin-bottom: 1.5rem;
      transition: all 0.3s ease;
    }
    .scenario-item-box:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    /* Section 8: Pricing Subscriptions */
    .pricing-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 3rem 2.2rem;
      position: relative;
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-lg);
      transform: scale(1.03);
    }
    .pricing-ribbon {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
      color: #fff;
      padding: 0.3rem 1.2rem;
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: var(--radius-pill);
      letter-spacing: 0.5px;
    }
    .pricing-price {
      font-size: 3rem;
      font-weight: 800;
      color: var(--dark);
      margin: 1.5rem 0;
    }
    .pricing-price small {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-muted);
    }

    /* Section 9: Trial Application */
    .trial-box-container {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    /* Section 10: Feedback / Reviews */
    .review-bubble-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .user-avatar-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    /* Section 11: News & Tech Logs */
    .news-article-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 100%;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .news-article-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .news-img-box {
      height: 180px;
      background-color: #0F172A;
      overflow: hidden;
    }
    .news-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* Section 12: Final Conversion */
    .final-cta-banner {
      background: linear-gradient(135deg, #3730A3 0%, #4F46E5 50%, #6366F1 100%);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 4.5rem 3rem;
      text-align: center;
      box-shadow: var(--shadow-lg);
      position: relative;
      overflow: hidden;
    }

    /* Site Footer */
    .site-footer {
      background-color: #0B0F19;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      font-size: 0.95rem;
    }
    .footer-title {
      color: #FFFFFF;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 1.25rem;
    }
    .footer-links-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links-list li {
      margin-bottom: 0.65rem;
    }
    .footer-links-list a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-trust-strip {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 1.8rem 0;
      margin: 3rem 0 1.8rem 0;
    }
    .footer-copyright {
      font-size: 0.85rem;
      color: #64748B;
    }

    @media (max-width: 991px) {
      .bento-h1 {
        font-size: 2.2rem;
      }
      .pricing-card.featured {
        transform: none;
      }
      .section-py {
        padding: 3.8rem 0;
      }
    }
    @media (max-width: 576px) {
      .bento-main-card {
        padding: 2rem 1.5rem;
      }
      .bento-h1 {
        font-size: 1.85rem;
      }
      .final-cta-banner {
        padding: 2.8rem 1.5rem;
      }
    }