/* roulang page: index */
:root {
      --bg-deep: #0A1128;
      --primary-cyan: #00F0FF;
      --accent-purple: #B026FF;
      --success-green: #00E676;
      --card-bg: rgba(20, 30, 60, 0.7);
      --white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6A7B98;
      --glass-border: rgba(0, 240, 255, 0.15);
      --page-padding: 24px;
      --max-width: 1280px;
      --section-gap: 120px;
      --font-en: "Inter", "Roboto", sans-serif;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--page-padding);
      width: 100%;
    }

    /* 沉浸式胶囊导航 */
    .main-header {
      position: fixed;
      top: 2rem;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 1080px;
      z-index: 100;
      background: rgba(10, 17, 40, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 60px;
      border: 1px solid rgba(0, 240, 255, 0.25);
      padding: 8px 18px;
      transition: all 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: #fff;
    }
    .logo-text span {
      color: var(--primary-cyan);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 1.8rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.9rem;
      color: #b0c4de;
      transition: 0.2s;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .nav-links a:hover,
    .nav-links a.active-link {
      color: #00F0FF;
      text-shadow: 0 0 8px rgba(0,240,255,0.3);
    }
    .btn-capsule {
      background: var(--primary-cyan);
      color: #0A1128;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.9rem;
      border: none;
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
      transition: all 0.25s;
      white-space: nowrap;
    }
    .btn-capsule:hover {
      box-shadow: 0 0 25px #00F0FF;
      background: #5cf0ff;
      color: #000;
      cursor: pointer;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 32px;
      height: 22px;
      cursor: pointer;
    }
    .hamburger span {
      height: 3px;
      background: var(--primary-cyan);
      border-radius: 4px;
      width: 100%;
    }
    @media (max-width: 820px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 移动端抽屉 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(6, 13, 34, 0.95);
      backdrop-filter: blur(30px);
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 200;
      gap: 2.5rem;
    }
    .mobile-menu a {
      font-size: 2rem;
      color: white;
      font-weight: 600;
      display: block;
    }
    .mobile-menu .close-menu {
      position: absolute;
      top: 32px;
      right: 32px;
      font-size: 2rem;
      color: var(--primary-cyan);
      background: none;
      border: none;
      cursor: pointer;
    }

    section {
      padding-top: var(--section-gap);
      padding-bottom: 0;
    }
    .hero, #cta, .section-spacing {
      margin-bottom: 0;
    }
    
    h1, h2, h3 {
      color: var(--white);
      font-weight: 700;
    }
    h1 { font-size: 56px; letter-spacing: -1px; }
    h2 { font-size: 40px; font-weight: 600; }
    h3 { font-size: 24px; font-weight: 500; }

    @media (max-width: 768px){
      h1 { font-size: 38px; }
      h2 { font-size: 30px; }
      :root { --section-gap: 70px; }
    }

    .btn-primary, .btn-ghost {
      display: inline-block;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      font-size: 1rem;
      transition: 0.3s;
    }
    .btn-primary {
      background: #00F0FF;
      color: #0A1128;
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.6);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px #00F0FF;
    }
    .btn-ghost {
      border: 1px solid #00F0FF;
      color: #00F0FF;
      background: transparent;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 15px #00f0ff55;
    }

    /* hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      position: absolute; inset: 0; background: rgba(10,17,40,0.75);
      backdrop-filter: blur(6px);
    }
    .hero-content {
      position: relative;
      z-index: 3;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .hero-left { flex:1; padding-right: 20px; }
    .dynamic-text {
      font-size: 1.4rem; color: var(--primary-cyan); margin: 12px 0 20px;
    }
    .hero-right img {
      border-radius: 30px; box-shadow: 0 0 40px rgba(0,240,255,0.3);
    }

    /* 六宫格 */
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: 28px;
      padding: 32px 24px;
      transition: all 0.35s ease;
    }
    .service-card:hover {
      transform: translateY(-9px);
      border-color: #00f0ff;
      box-shadow: 0 20px 30px -12px rgba(0,240,255,0.2);
      background: rgba(20,40,80,0.7);
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      margin-top: 30px;
    }
    .stat-item {
      background: rgba(255,255,255,0.04);
      border-radius: 24px;
      padding: 28px 16px;
      text-align: center;
      border:1px solid rgba(0,240,255,0.15);
    }
    .stat-number {
      font-family: var(--font-en);
      font-size: 3.2rem;
      font-weight: 700;
      color: #fff;
      font-feature-settings: "tnum";
    }
    
    @media (max-width: 768px) {
      .grid-6 { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .hero-content { flex-direction: column; }
    }
    
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 36px;
    }
    details { background: rgba(255,255,255,0.03); border-radius: 20px; padding: 20px; border:1px solid rgba(0,255,200,0.12); }
    summary { font-weight: 600; color: #fff; cursor: pointer; }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      padding: 50px 0;
      color: var(--text-muted);
    }

    .cta-form input {
      background: rgba(10,20,40,0.8); border:none; border-bottom: 2px solid #00f0ff;
      padding: 14px; color:white; border-radius: 8px;
    }
    .pulse-purple {
      background: var(--accent-purple);
      border: none;
      box-shadow: 0 0 25px #b026ffaa;
    }

    @media (max-width: 640px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }