/* roulang page: index */
:root {
      --deep-blue: #0A1A2F;
      --deep-bg: #05101E;
      --cyan-gradient: linear-gradient(135deg, #00C9E0 0%, #0077B6 100%);
      --electric-cyan: #00F0FF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(0, 240, 255, 0.25);
      --white-85: rgba(255, 255, 255, 0.85);
      --white-50: rgba(255, 255, 255, 0.5);
      --form-bg: #020C17;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.08);
      --shadow-glow-hover: 0 0 30px rgba(0, 240, 255, 0.25);
      --font-zh: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-num: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-zh);
      background: linear-gradient(180deg, #0A1A2F 0%, #05101E 100%);
      color: var(--white-85);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    h1, h2, h3 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
      color: white;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
      color: white;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      font-family: var(--font-zh);
      cursor: pointer;
      border: none;
      background: none;
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition-smooth);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
    }

    .header.scrolled {
      background: rgba(10, 26, 47, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      background: var(--cyan-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--white-85);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      box-shadow: 0 0 12px var(--electric-cyan);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--cyan-gradient);
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      color: white !important;
      font-weight: 600;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      transition: box-shadow 0.3s, transform 0.2s;
      margin-left: 16px;
    }

    .nav-cta:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.6);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(5, 16, 30, 0.98);
      backdrop-filter: blur(30px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 999;
    }

    .mobile-menu a {
      font-size: 28px;
      color: white;
      font-weight: 600;
    }

    .mobile-menu .close-menu {
      position: absolute;
      top: 32px;
      right: 32px;
      font-size: 36px;
      color: white;
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .container {
        padding: 0 24px;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    @media (max-width: 480px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10, 26, 47, 0.75);
    }

    .hero-content {
      max-width: 700px;
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: var(--white-50);
      margin-bottom: 36px;
      line-height: 1.6;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--cyan-gradient);
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      color: white;
      box-shadow: 0 0 30px rgba(0,240,255,0.4);
      transition: box-shadow 0.3s, transform 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--electric-cyan);
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      color: white;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .btn-ghost:hover {
      background: rgba(0, 201, 224, 0.15);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    }

    /* 数据看板 */
    .stats-board {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      padding: 40px 32px;
      margin-top: -60px;
      position: relative;
      z-index: 3;
      box-shadow: var(--shadow-glow);
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-num);
      font-size: 48px;
      font-weight: 800;
      color: var(--electric-cyan);
      line-height: 1;
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--white-50);
      font-size: 15px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s ease;
    }

    .service-card:hover {
      border-color: var(--glass-hover-border);
      box-shadow: var(--shadow-glow-hover);
      transform: translateY(-4px);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--cyan-gradient);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 24px;
    }

    /* 对比区 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--glass-border);
    }

    .compare-card.highlight {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.2);
    }

    .compare-list {
      list-style: none;
      margin-top: 20px;
    }

    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: var(--glass-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--glass-border);
      transition: 0.3s;
    }

    .case-card:hover {
      border-color: var(--glass-hover-border);
      transform: translateY(-5px);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-info {
      padding: 20px;
    }

    .case-stat {
      color: var(--electric-cyan);
      font-weight: 700;
      font-size: 20px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--white-50);
      display: none;
    }

    .faq-item.active {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.2);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: #020C17;
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.2);
      padding: 12px 0;
      color: white;
      font-size: 16px;
      outline: none;
      transition: border-color 0.3s;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      border-bottom-color: var(--electric-cyan);
    }

    .trust-badges {
      display: flex;
      gap: 16px;
      margin-top: 24px;
    }

    /* 页脚 */
    .footer {
      background: #020C17;
      padding: 60px 0 30px;
      color: var(--white-50);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
    }