/* roulang page: index */
:root {
      --primary: #F5A623;
      --primary-dark: #E09515;
      --primary-soft: rgba(245,166,35,0.1);
      --secondary: #2E8B57;
      --dark-bg: #1E1E24;
      --dark-bg-2: #2A2A35;
      --light-bg: #F9F6F0;
      --text-main: #1E1E24;
      --text-body: #555;
      --text-muted: #777;
      --text-light: #999;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 32px rgba(245,166,35,0.15);
      --border-light: rgba(0,0,0,0.04);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      margin: 0;
      background-color: #fff;
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航系统 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 16px 0;
    }
    
    .navbar.scrolled {
      background: rgba(30,30,36,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.2);
      border-bottom: 1px solid rgba(245,166,35,0.3);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
      transition: color 0.2s;
    }
    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }
    .navbar.scrolled .logo {
      color: #fff;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      transition: color 0.2s;
      padding: 4px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-primary-nav {
      background: var(--primary);
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
      white-space: nowrap;
    }
    .btn-primary-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 20px rgba(245,166,35,0.5);
    }
    
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: #fff;
      cursor: pointer;
      background: none;
      border: none;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(30,30,36,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
    }
    .mobile-menu a {
      color: #fff;
      font-size: 1.8rem;
      font-weight: 600;
    }
    .mobile-menu .btn-primary-nav {
      font-size: 1.2rem;
      padding: 14px 32px;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }
    
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* 标题样式 */
    h2 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 16px;
      position: relative;
    }
    h2::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto 0;
      border-radius: 4px;
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 28px;
      }
    }
    
    /* 卡片基础 */
    .card {
      background: #fff;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }
    
    /* Hero */
    .hero {
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(30,30,36,0.85) 0%, rgba(30,30,36,0.4) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #fff;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
      box-shadow: 0 8px 24px rgba(245,166,35,0.4);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 12px 28px rgba(245,166,35,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: rgba(245,166,35,0.1);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .btn-group .btn-primary, .btn-group .btn-outline {
        width: 100%;
      }
    }
    
    /* 服务卡片 */
    .service-icon {
      width: 64px;
      height: 64px;
      background: var(--primary-soft);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    
    /* 优势数字 */
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }
    
    /* 案例卡片 */
    .case-img {
      height: 220px;
      object-fit: cover;
      border-radius: 16px 16px 0 0;
    }
    
    /* 解决方案图文 */
    .solution-img {
      width: 100%;
      height: auto;
      border-radius: 16px;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #eee;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: #666;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* 表单 */
    .input-field {
      background: #F5F5F5;
      border: none;
      border-bottom: 2px solid #DDD;
      padding: 14px;
      width: 100%;
      border-radius: 4px;
      transition: 0.3s;
    }
    .input-field:focus {
      outline: none;
      border-bottom-color: var(--primary);
    }
    
    /* 页脚 */
    footer a:hover {
      color: var(--primary);
      transform: translateX(4px);
      display: inline-block;
      transition: 0.2s;
    }