/* roulang page: index */
:root {
      --primary: #1A7BFF;
      --primary-light: #e8f2ff;
      --accent-orange: #FF7A3D;
      --accent-orange-light: #fff3ed;
      --accent-green: #00C9A7;
      --accent-green-light: #e6faf6;
      --dark: #1A1D26;
      --gray-800: #2D3748;
      --gray-600: #4A5568;
      --gray-500: #718096;
      --gray-300: #CBD5E0;
      --gray-200: #E2E8F0;
      --gray-100: #F7F8FA;
      --gray-50: #F7FAFF;
      --white: #FFFFFF;
      --border-light: #EFF2F6;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-md: 0 10px 30px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.03);
      --shadow-hover: 0 20px 40px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --radius-btn: 10px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--white);
      color: var(--gray-600);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h2, .h3 {
      color: var(--dark);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
    }
    .card-title {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
      color: var(--dark);
    }
    .text-body {
      font-size: 16px;
      color: var(--gray-600);
      line-height: 1.7;
    }
    .text-muted {
      color: var(--gray-500);
      font-size: 14px;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent-orange);
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .navbar-custom {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      height: 72px;
      padding: 0 1.5rem;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--accent-orange);
      border-radius: 50%;
      margin-left: 4px;
      vertical-align: middle;
    }
    .nav-link-custom {
      font-size: 15px;
      font-weight: 500;
      color: var(--gray-800) !important;
      margin: 0 12px;
      padding: 8px 4px;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--primary) !important;
      border-bottom-color: var(--primary);
    }
    .search-input {
      background: var(--gray-100);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-pill);
      padding: 8px 16px;
      font-size: 14px;
      width: 160px;
      transition: var(--transition);
      outline: none;
    }
    .search-input:focus {
      width: 200px;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,123,255,0.1);
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(26,123,255,0.25);
      font-size: 15px;
    }
    .btn-primary-custom:hover {
      background: #0f6ae0;
      box-shadow: 0 8px 18px rgba(26,123,255,0.35);
      transform: translateY(-1px);
      color: white;
    }
    .btn-outline-accent {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      transition: var(--transition);
    }
    .btn-outline-accent:hover {
      background: rgba(26,123,255,0.05);
      border-color: #0f6ae0;
      color: #0f6ae0;
    }
    .btn-orange {
      background: var(--accent-orange);
      border: none;
      color: white;
      font-weight: 600;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      box-shadow: 0 8px 20px rgba(255,122,61,0.3);
      transition: var(--transition);
      font-size: 17px;
      letter-spacing: 0.3px;
    }
    .btn-orange:hover {
      background: #f0652a;
      transform: translateY(-2px);
      box-shadow: 0 15px 28px rgba(255,122,61,0.4);
      color: white;
    }
    .navbar-toggler {
      border: none;
      color: var(--dark);
    }
    /* Hero */
    .hero-section {
      padding-top: 120px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: var(--white);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-shape {
      position: absolute;
      right: -20px;
      top: 50%;
      transform: translateY(-50%);
      width: 50%;
      height: 90%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      clip-path: polygon(12% 0, 100% 0, 100% 100%, 0% 100%);
      opacity: 0.9;
    }
    .hero-overlay-geo {
      position: absolute;
      right: 0;
      top: 20%;
      width: 45%;
      height: 70%;
      background: radial-gradient(circle at 20% 30%, rgba(26,123,255,0.15) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-title span.highlight {
      background: linear-gradient(120deg, rgba(255,122,61,0.2) 0%, rgba(255,122,61,0.2) 70%);
      padding: 0 8px;
      border-radius: 4px;
      color: var(--dark);
    }
    /* 卡片与布局 */
    .feature-large-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
      height: 100%;
    }
    .feature-large-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-sm-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-green);
      transition: var(--transition);
      height: 100%;
    }
    .service-bento {
      border-radius: var(--radius-lg);
      background: var(--gray-100);
      padding: 2rem;
      transition: var(--transition);
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .service-bento:hover {
      background: var(--white);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-green-light);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-green);
      font-size: 28px;
    }
    .scenario-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    .scenario-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
      padding: 30px 20px;
      font-weight: 600;
      font-size: 22px;
    }
    .faq-item {
      background: var(--gray-100);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 12px;
      cursor: pointer;
      transition: var(--transition);
    }
    .faq-item.active {
      background: white;
      box-shadow: var(--shadow-sm);
      border-left: 3px solid var(--accent-orange);
    }
    .footer-custom {
      background: var(--dark);
      color: var(--gray-500);
      padding: 50px 0 25px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      .section-title { font-size: 30px; }
      .hero-bg-shape { width: 90%; right: -60px; opacity: 0.35; }
    }
    @media (max-width: 768px) {
      .navbar-collapse { background: white; padding: 1rem; border-radius: 12px; box-shadow: var(--shadow-md); }
    }