/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-red: #FF4655;
      --white-soft: rgba(255, 255, 255, 0.85);
      --white-muted: rgba(255, 255, 255, 0.7);
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-border-hover: rgba(0, 240, 255, 0.5);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --card-shadow-hover: 0 16px 48px rgba(0, 240, 255, 0.2);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-img: 12px;
      --transition-smooth: 0.3s ease;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', 'SF Pro Display', sans-serif;
      background-color: var(--primary-deep);
      color: #ffffff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #00F0FF, #00A6E0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .logo i {
      font-size: 26px;
      background: none;
      -webkit-text-fill-color: #00F0FF;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      color: var(--white-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.3s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      font-weight: 600;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      box-shadow: 0 0 20px rgba(255, 70, 85, 0.6);
      transition: all 0.3s ease;
      display: inline-block;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: #ff5e6b;
      box-shadow: 0 0 32px rgba(255, 70, 85, 0.9);
      transform: scale(1.03);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 11px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.3s;
      display: inline-block;
    }
    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.08);
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
    }

    /* 移动端底部导航 (默认隐藏) */
    .mobile-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: #0A0E27;
      background-blend-mode: overlay;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at center, transparent 0%, #0A0E27 95%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(38px, 8vw, 56px);
      font-weight: 800;
      letter-spacing: 2px;
      background: linear-gradient(180deg, #00F0FF 20%, #0088CC 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 40px rgba(0, 240, 255, 0.6);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.65);
      margin-bottom: 32px;
    }
    .cta-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      font-size: 32px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
    }
    .section-title::after {
      content: "";
      display: block;
      width: 70px;
      height: 4px;
      background: var(--accent-cyan);
      margin: 10px auto 0;
      border-radius: 2px;
    }

    /* 服务卡片2x2 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .service-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(18px);
      border: 1px solid rgba(0, 240, 255, 0.12);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .service-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-5px);
    }
    .service-icon {
      font-size: 46px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .service-card p {
      color: var(--white-muted);
    }

    /* 数据条 */
    .stats-row {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 30px;
      background: rgba(255,255,255,0.02);
      padding: 30px 20px;
      border-top: 1px solid rgba(0,240,255,0.25);
      border-bottom: 1px solid rgba(0,240,255,0.25);
    }
    .stat-item {
      flex: 1;
      text-align: center;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--accent-red);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 15px;
      color: rgba(255,255,255,0.7);
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .case-card {
      height: 300px;
      border-radius: var(--radius-img);
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.25);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(10,14,39,0.9);
      backdrop-filter: blur(10px);
      padding: 20px;
      transform: translateY(100%);
      transition: 0.3s ease;
    }
    .case-card:hover .case-overlay {
      transform: translateY(0);
    }
    .case-overlay h4 {
      color: var(--accent-cyan);
      font-weight: 700;
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-top: 50px;
      flex-wrap: wrap;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-img);
      border: 1px solid rgba(0,240,255,0.5);
      overflow: hidden;
    }
    .solution-img img {
      width: 100%;
      display: block;
      height: auto;
    }
    .list-cyan {
      list-style: none;
      margin-top: 15px;
    }
    .list-cyan li::before {
      content: "●";
      color: var(--accent-cyan);
      font-size: 14px;
      margin-right: 10px;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-left: 3px solid var(--accent-cyan);
      margin-bottom: 16px;
      border-radius: 0 12px 12px 0;
      padding: 18px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: rgba(255,255,255,0.7);
    }
    .faq-item.active {
      border-left-color: var(--accent-red);
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }

    /* 联系表单 */
    .contact-dark {
      background: rgba(255,255,255,0.02);
      border-radius: 24px;
      padding: 50px;
      text-align: center;
    }
    .form-input {
      width: 100%;
      padding: 14px;
      margin: 12px 0;
      background: #0A0E27;
      border: 1px solid rgba(0,240,255,0.4);
      border-radius: 8px;
      color: white;
      transition: 0.2s;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--accent-cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.5);
    }

    footer {
      background: #0A0E27;
      padding: 40px 0;
      text-align: center;
      border-top: 1px solid rgba(0,240,255,0.2);
    }
    .social-icons i {
      font-size: 24px;
      margin: 0 12px;
      color: rgba(255,255,255,0.4);
      transition: 0.3s;
    }
    .social-icons i:hover {
      color: var(--accent-cyan);
    }

    @media (max-width: 768px) {
      .navbar .nav-links, .navbar .btn-primary {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(10,14,39,0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 10px 10px;
        z-index: 1000;
        border-top: 1px solid rgba(0,240,255,0.3);
      }
      .mobile-nav a {
        color: rgba(255,255,255,0.7);
        text-decoration: none;
        font-size: 13px;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .services-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .stats-row {
        flex-wrap: wrap;
      }
    }