/* roulang page: index */
/* 设计令牌 :root 系统 */
    :root {
      --primary: #F15A24;
      --primary-hover: #D94A1A;
      --primary-soft: rgba(241, 90, 36, 0.1);
      --accent-amber: #F7A81B;
      --accent-green: #1B4332;
      
      --bg-page: #F5F0EB;
      --bg-card: #FFFFFF;
      --bg-light: #FAF8F6;
      
      --text-main: #1E1D1C;
      --text-secondary: #6B6B6B;
      --text-muted: #9E9E9E;
      
      --border-light: rgba(0, 0, 0, 0.04);
      --border-input: #E0DBD5;
      --border-card: #E8E3DD;
      
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --radius-input: 8px;
      
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 6px 16px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      
      --spacing-section: 7.5rem; /* 120px */
      --max-width: 1200px;
    }
    
    /* Reset & Base */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    /* 容器 */
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 板块间距 */
    .section {
      padding-top: var(--spacing-section);
      padding-bottom: var(--spacing-section);
    }
    
    /* 导航 – SaaS命令栏风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(245, 240, 235, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: background 0.3s;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    .logo {
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--text-main);
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .logo a {
      color: inherit;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    
    .search-box {
      display: flex;
      align-items: center;
      background: white;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      border: 1px solid transparent;
      transition: border 0.2s, box-shadow 0.2s;
      background: #fff;
    }
    .search-box i {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-right: 0.4rem;
    }
    .search-box input {
      border: none;
      outline: none;
      background: transparent;
      font-size: 0.9rem;
      width: 140px;
      color: var(--text-main);
    }
    .search-box:focus-within {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(241,90,36,0.2);
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--text-main);
      color: var(--text-main);
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--text-main);
      color: white;
    }
    
    /* 移动端汉堡菜单 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    
    /* Hero 双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 6fr 4fr;
      gap: 3rem;
      align-items: center;
      min-height: 85vh;
      padding-top: 5rem;
    }
    
    .hero-tag {
      display: inline-block;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 0.3rem 1rem;
      border-radius: 20px;
      margin-bottom: 1.5rem;
      letter-spacing: 0.3px;
    }
    
    h1 {
      font-size: clamp(2.8rem, 5vw, 3.8rem);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--text-main);
      margin-bottom: 1.5rem;
    }
    
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 520px;
      line-height: 1.8;
      margin-bottom: 2rem;
    }
    
    .hero-cta {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    .hero-image {
      background: url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      min-height: 380px;
      width: 100%;
      box-shadow: var(--shadow-sm);
    }
    
    /* 标题装饰 */
    .section-title {
      font-size: 2.3rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 1rem;
      position: relative;
      color: var(--text-main);
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--primary);
      margin: 0.75rem auto 0;
      border-radius: 2px;
    }
    
    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 650px;
      margin: 0 auto 3rem;
    }
    
    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    
    .service-card {
      background: var(--bg-card);
      padding: 2rem;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .card-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    .service-card p {
      color: var(--text-secondary);
      line-height: 1.7;
      flex: 1;
    }
    
    /* 优势数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 3rem 2rem;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }
    
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .case-card {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      aspect-ratio: 16/9;
      background: #ddd;
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      padding: 1.5rem;
      color: white;
      transform: translateY(0);
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-input);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 1rem;
    }
    
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: start;
    }
    .input-field {
      width: 100%;
      padding: 0.8rem 1rem;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      margin-bottom: 1rem;
      background: white;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(241,90,36,0.15);
    }
    
    /* 页脚 */
    .footer {
      background: #1E1D1C;
      color: #9E9E9E;
      padding: 3rem 0 1.5rem;
    }
    
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box { display: none; }
      .mobile-toggle { display: block; }
      .case-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .section { padding-top: 4rem; padding-bottom: 4rem; }
    }