/* roulang page: index */
:root {
      --primary: #0B1A2F;
      --accent: #00E5FF;
      --gold: #F0B90B;
      --text: #B0C4DE;
      --text-light: #E5EEFF;
      --card-bg: rgba(255,255,255,0.04);
      --card-border: rgba(255,255,255,0.08);
      --glass-blur: blur(20px);
      --radius-card: 16px;
      --radius-btn: 10px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--primary);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -0.02em;
    }

    h1 { font-size: 48px; }
    h2 { font-size: 36px; }
    h3 { font-size: 22px; font-weight: 600; }

    a {
      color: var(--accent);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: #FFFFFF;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: all 0.2s ease;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-btn);
      padding: 0 28px;
      height: 48px;
      min-width: 140px;
      font-size: 16px;
      white-space: nowrap;
    }

    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      transition: all 0.25s ease;
    }

    .glass-card:hover {
      border-color: var(--accent);
      box-shadow: 0 8px 32px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,229,255,0.2);
      transform: translateY(-2px);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00E5FF 0%, #0088CC 100%);
      color: #FFFFFF;
      box-shadow: 0 0 20px rgba(0,229,255,0.4);
      border: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,229,255,0.7);
      transform: scale(1.02);
      color: #FFFFFF;
    }
    .btn-primary:active {
      transform: scale(0.97);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      border-color: #FFFFFF;
      color: #FFFFFF;
    }

    .text-accent { color: var(--accent); }
    .text-gold { color: var(--gold); }
    .bg-primary { background-color: var(--primary); }
    .border-accent { border-color: var(--accent); }

    .section-padding {
      padding: 100px 24px;
    }
    @media (max-width: 768px) {
      .section-padding { padding: 60px 16px; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .btn { padding: 0 20px; height: 44px; min-width: 120px; font-size: 15px; }
    }

    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
    }

    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(11,26,47,0.78);
      backdrop-filter: blur(12px);
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      border-bottom: 1px solid rgba(0,229,255,0.12);
    }
    .nav-left { display: flex; align-items: center; gap: 32px; }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-anchors { display: flex; gap: 24px; }
    .nav-anchors a {
      color: var(--text);
      font-size: 15px;
      font-weight: 500;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-anchors a:hover, .nav-anchors a.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .nav-right { display: flex; align-items: center; gap: 20px; }

    /* 汉堡菜单 (移动端) */
    #menu-toggle { display: none; }
    .hamburger-icon { display: none; cursor: pointer; color: var(--accent); font-size: 28px; }

    @media (max-width: 768px) {
      .nav-anchors, .nav-right .btn {
        display: none;
      }
      .hamburger-icon { display: block; }
      .main-nav { padding: 0 20px; }
      #menu-toggle:checked ~ .mobile-menu {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(11,26,47,0.95);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--accent);
      }
      .mobile-menu { display: none; }
      .mobile-menu a, .mobile-menu .btn {
        display: block;
        color: var(--text);
        font-size: 18px;
        padding: 10px 0;
        text-align: center;
      }
      .mobile-menu .btn-outline {
        border-color: var(--accent);
        color: var(--accent);
        width: fit-content;
        margin: 0 auto;
      }
    }

    /* Hero 分屏 */
    .hero-grid {
      display: flex;
      min-height: 100vh;
      align-items: center;
    }
    .hero-left {
      width: 40%;
      padding: 0 32px 0 48px;
      z-index: 10;
    }
    .hero-right {
      width: 60%;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,26,47,0.85) 0%, rgba(0,229,255,0.18) 100%);
      backdrop-filter: blur(2px);
    }
    .hero-visual-content {
      position: relative;
      z-index: 2;
      width: 100%;
      height: 100%;
    }
    @media (max-width: 1024px) {
      .hero-left { width: 50%; padding-left: 32px; }
      .hero-right { width: 50%; }
    }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { width: 100%; }
      .hero-left { padding: 120px 24px 40px; text-align: center; }
      .hero-right { min-height: 400px; }
    }

    .btn-group { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 32px; }

    /* 网格动画粒子 */
    .particle-bg {
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.1) 1px, transparent 1px);
      background-size: 40px 40px;
      opacity: 0.6;
    }

    /* 价值主张卡片 */
    .value-card i {
      font-size: 42px;
      color: var(--accent);
      margin-bottom: 20px;
      filter: drop-shadow(0 0 8px rgba(0,229,255,0.5));
    }

    /* 功能交错行 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse { flex-direction: row-reverse; }
    .feature-img {
      width: 50%;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 12px 30px rgba(0,0,0,0.6);
    }
    .feature-text { width: 50%; }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse { flex-direction: column; }
      .feature-img, .feature-text { width: 100%; }
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-left: 3px solid transparent;
      background: rgba(255,255,255,0.03);
      margin-bottom: 12px;
      border-radius: 0 8px 8px 0;
      transition: 0.2s;
    }
    .faq-item[open] {
      border-left-color: var(--accent);
      background: rgba(0,229,255,0.03);
    }
    .faq-summary {
      padding: 18px 24px;
      font-weight: 600;
      color: #FFFFFF;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-summary::-webkit-details-marker { display: none; }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
      color: #8899AA;
    }