/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-deep: #0052CC;
      --accent-green: #00E5A0;
      --accent-gold: #FFB800;
      --bg-page: #F8FAFD;
      --card-bg: #FFFFFF;
      --text-main: #1A2332;
      --text-muted: #5A6D80;
      --border-light: #E5ECF3;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 12px rgba(10,110,255,0.06);
      --shadow-card-hover: 0 8px 28px rgba(10,110,255,0.12);
      --transition: 0.25s ease;
      --bs-gutter-x: 2rem;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', 'SF Pro Display', sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.8;
      margin: 0;
      padding-bottom: 80px;
    }
    h1, h2, h3, h4, .data-number {
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .desktop-nav {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      padding: 16px 0;
      position: sticky;
      top: 0;
      z-index: 100;
      display: none;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-logo span {
      color: var(--primary);
    }
    .nav-link-item {
      color: var(--text-main);
      font-weight: 500;
      margin: 0 12px;
      padding: 8px 4px;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
    }
    .nav-link-item:hover,
    .nav-link-item.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-nav-cta {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 8px 22px;
      font-weight: 600;
      font-size: 0.9rem;
      margin-left: 16px;
      transition: var(--transition);
    }
    .btn-nav-cta:hover {
      background: var(--primary-deep);
      color: white;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(10,110,255,0.3);
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: 0 -2px 12px rgba(0,0,0,0.03);
      display: flex;
      justify-content: space-around;
      align-items: center;
      height: 64px;
      padding-bottom: env(safe-area-inset-bottom);
      z-index: 105;
    }
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 10px;
      font-weight: 500;
      transition: var(--transition);
      padding: 6px 0;
      width: 20%;
      text-align: center;
    }
    .mobile-tab i {
      font-size: 22px;
      margin-bottom: 2px;
      color: inherit;
    }
    .mobile-tab.active {
      color: var(--primary);
    }
    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* Hero */
    #hero {
      background: radial-gradient(circle at 30% 40%, rgba(10,110,255,0.06) 0%, var(--bg-page) 70%);
      position: relative;
      overflow: hidden;
      padding-top: 40px;
      padding-bottom: 80px;
    }
    .hero-bg-img {
      position: absolute;
      right: -20px;
      top: 0;
      width: 55%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.15;
      z-index: 0;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      color: var(--text-main);
    }
    h1 .highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 560px;
      margin-bottom: 32px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(10,110,255,0.2);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(10,110,255,0.35);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
      transform: translateY(-2px);
    }
    /* 服务 1+2 布局 */
    .service-main-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--primary);
      transition: var(--transition);
      height: 100%;
    }
    .service-sub-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--accent-green);
      transition: var(--transition);
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .service-sub-card .service-icon {
      color: var(--accent-green);
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      font-family: 'Inter', sans-serif;
      color: var(--text-main);
    }
    .data-label {
      color: var(--text-muted);
      font-weight: 500;
    }
    .advantage-bg {
      background: #F0F4FC;
      border-radius: 32px;
      padding: 40px 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,110,255,0.15);
      transform: translateY(-4px);
    }
    .accordion-button {
      background: white;
      font-weight: 600;
      box-shadow: none;
      border: none;
      padding: 20px 24px;
      color: var(--text-main);
    }
    .accordion-button:not(.collapsed) {
      background: #F8FAFD;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-body {
      background: #F8FAFD;
      border-left: 4px solid var(--primary);
      margin-left: 16px;
      padding: 16px 24px;
    }
    footer {
      background: #1A2332;
      color: #B0C0D0;
      padding: 60px 0 30px;
    }
    .footer-title {
      color: white;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-link {
      color: #B0C0D0;
      display: block;
      margin-bottom: 8px;
    }
    .footer-link:hover {
      color: var(--accent-green);
    }
    @media (min-width: 992px) {
      .desktop-nav {
        display: block;
      }
      .mobile-bottom-nav {
        display: none;
      }
      body {
        padding-bottom: 0;
      }
      h1 {
        font-size: 3.8rem;
      }
    }
    @media (max-width: 991px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      h1 {
        font-size: 2.5rem;
      }
    }
    .form-control-underline {
      background: #F8FAFD;
      border: none;
      border-bottom: 2px solid var(--border-light);
      border-radius: 4px 4px 0 0;
      padding: 12px 16px;
      transition: 0.2s;
    }
    .form-control-underline:focus {
      border-bottom-color: var(--primary);
      background: white;
      box-shadow: none;
    }