/* roulang page: index */
:root {
      --bg-base: #0A0F1D;
      --bg-darker: #040711;
      --bg-card: rgba(16, 24, 48, 0.72);
      --bg-card-hover: rgba(22, 34, 66, 0.85);
      --border-cyan: rgba(0, 240, 255, 0.18);
      --border-cyan-active: rgba(0, 240, 255, 0.5);
      --primary-blue: #0066FF;
      --electric-cyan: #00F0FF;
      --alert-gold: #FF9900;
      --text-white: #FFFFFF;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-base);
      color: var(--text-white);
      font-family: var(--font-stack);
      line-height: 1.7;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 50% 0%, #131f3d 0%, var(--bg-base) 60%, var(--bg-darker) 100%);
    }

    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;
    }

    /* Top utility bar */
    .top-bar {
      height: 38px;
      background: rgba(4, 7, 17, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 13px;
      display: flex;
      align-items: center;
      color: var(--text-muted);
    }
    .top-bar .inner {
      display: flex;
      justify-content: space-between;
      width: 100%;
    }
    .top-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10B981;
    }

    /* Sticky Main Navigation */
    .site-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 15, 29, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-cyan);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo span {
      color: var(--electric-cyan);
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 28px;
    }
    .nav-links a {
      font-size: 14.5px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--primary-blue), var(--electric-cyan));
      color: #040711;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 6px;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      display: inline-block;
      font-size: 14px;
    }
    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 26px rgba(0, 240, 255, 0.6);
      color: #000;
    }
    .btn-outline {
      background: rgba(0, 240, 255, 0.05);
      border: 1px solid var(--border-cyan-active);
      color: var(--electric-cyan);
      padding: 10px 22px;
      border-radius: 6px;
      font-weight: 500;
      display: inline-block;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.15);
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.3);
    }

    /* Section Foundations */
    section {
      padding: 85px 0;
      scroll-margin-top: 80px;
      position: relative;
    }
    .section-header {
      margin-bottom: 50px;
      text-align: center;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(0, 240, 255, 0.08);
      border: 1px solid var(--border-cyan);
      border-radius: 20px;
      font-size: 12.5px;
      color: var(--electric-cyan);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }
    .section-desc {
      font-size: 15.5px;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto;
      line-height: 1.8;
    }

    /* Card System */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-cyan);
      border-radius: 12px;
      padding: 30px;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 0 12px 36px 0 rgba(0, 0, 0, 0.35);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--border-cyan-active);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
      box-shadow: 0 18px 42px rgba(0, 240, 255, 0.15);
    }

    /* 1. Hero Section: Dual Column Portal */
    .hero-section {
      padding: 70px 0 90px;
      background: linear-gradient(180deg, rgba(16, 28, 56, 0.4) 0%, rgba(10, 15, 29, 0.95) 100%), url('/assets/images/1b90b90720ab1d71.png') center/cover no-repeat;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 42px;
      line-height: 1.3;
      font-weight: 800;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-content h1 span {
      background: linear-gradient(90deg, #FFFFFF 0%, var(--electric-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 34px;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .quick-entry-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .entry-tile {
      background: rgba(16, 24, 48, 0.8);
      border: 1px solid var(--border-cyan);
      border-radius: 10px;
      padding: 20px;
      backdrop-filter: blur(12px);
      transition: all 0.25s;
    }
    .entry-tile:hover {
      border-color: var(--electric-cyan);
      transform: translateY(-2px);
    }
    .entry-tile h4 {
      font-size: 16px;
      color: var(--text-white);
      margin-bottom: 6px;
    }
    .entry-tile p {
      font-size: 13px;
      color: var(--text-dim);
      line-height: 1.5;
    }

    /* 2. Pain Points Grid */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }
    .pain-tag {
      color: var(--alert-gold);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 10px;
      display: inline-block;
    }

    /* 3. Product Overview */
    .split-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .param-list {
      list-style: none;
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .param-item {
      display: flex;
      justify-content: space-between;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding-bottom: 8px;
      font-size: 14.5px;
    }
    .param-label {
      color: var(--text-muted);
    }
    .param-val {
      color: var(--electric-cyan);
      font-weight: 600;
    }

    /* 4. Core Advantages */
    .core-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    /* 5. Featured Solutions */
    .solutions-stack {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .sol-card {
      display: grid;
      grid-template-columns: 320px 1fr;
      gap: 32px;
      align-items: center;
    }
    .sol-img {
      border-radius: 8px;
      height: 220px;
      object-fit: cover;
      width: 100%;
    }
    .tag-row {
      display: flex;
      gap: 8px;
      margin-bottom: 14px;
      flex-wrap: wrap;
    }
    .tag-item {
      font-size: 12px;
      padding: 3px 10px;
      border-radius: 4px;
      background: rgba(0, 102, 255, 0.2);
      border: 1px solid rgba(0, 240, 255, 0.3);
      color: var(--electric-cyan);
    }

    /* 6. Philosophy & Security */
    .philosophy-sec {
      background: linear-gradient(180deg, var(--bg-darker) 0%, rgba(13, 22, 41, 0.8) 50%, var(--bg-darker) 100%);
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 36px;
    }
    .step-box {
      border-left: 2px solid var(--electric-cyan);
      padding-left: 18px;
    }
    .step-num {
      color: var(--electric-cyan);
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 6px;
    }

    /* 7. Customer Stories */
    .story-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .story-card {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-cyan);
      border-radius: 12px;
      padding: 24px;
    }
    .story-col-left {
      border-right: 1px solid rgba(255, 255, 255, 0.08);
      padding-right: 18px;
    }

    /* 8. Key Metrics Bar */
    .metrics-bar {
      padding: 45px 0;
      background: rgba(16, 24, 48, 0.85);
      border-top: 1px solid var(--border-cyan);
      border-bottom: 1px solid var(--border-cyan);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .metric-number {
      font-size: 38px;
      font-weight: 800;
      color: var(--electric-cyan);
      line-height: 1.1;
      margin-bottom: 6px;
      text-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
    }
    .metric-label {
      font-size: 13.5px;
      color: var(--text-muted);
    }

    /* 9. Testimonials */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .avatar-mock {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066FF, #00F0FF);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #040711;
      font-size: 18px;
    }

    /* 10. News & Insights */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-dim);
      margin-bottom: 8px;
    }

    /* 11. FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-cyan);
      border-radius: 8px;
      padding: 20px 24px;
    }
    .faq-q {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
    }
    .faq-a {
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* 12. Final Conversion CTA */
    .cta-card {
      background: linear-gradient(135deg, rgba(19, 28, 56, 0.9), rgba(10, 15, 29, 0.95));
      border: 1px solid var(--border-cyan-active);
      box-shadow: 0 0 40px rgba(0, 102, 255, 0.2);
      border-radius: 16px;
      padding: 50px;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .lead-form {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .form-input, .form-select {
      width: 100%;
      background: rgba(4, 7, 17, 0.7);
      border: 1px solid var(--border-cyan);
      padding: 12px 16px;
      border-radius: 6px;
      color: #FFF;
      font-size: 14px;
      outline: none;
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

    /* Footer */
    footer {
      background: #040711;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 60px 0 25px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      color: var(--text-white);
      font-size: 16px;
      margin-bottom: 16px;
    }
    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-list a:hover {
      color: var(--electric-cyan);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 25px;
      text-align: center;
      font-size: 13px;
      color: var(--text-dim);
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-grid, .split-layout, .sol-card, .cta-card, .story-grid {
        grid-template-columns: 1fr;
      }
      .pain-grid, .core-grid, .testi-grid, .insights-grid, .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .timeline-steps {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-links { display: none; }
      .pain-grid, .core-grid, .testi-grid, .insights-grid, .footer-grid, .quick-entry-grid, .timeline-steps, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
      }
      .story-col-left {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        padding-bottom: 16px;
        padding-right: 0;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .cta-card {
        padding: 24px;
      }
    }