/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --primary: #004d40;        /* 深翡翠绿 */
      --primary-light: #1a5f53;
      --secondary: #f4ebd9;      /* 暖沙色 */
      --accent: #b87333;         /* 亮铜色 */
      --accent-light: #c5a059;
      --dark-bg: #1a2a27;
      --white: #ffffff;
      --off-white: #fdfdfc;
      --text-dark: #2e2e2e;
      --text-body: #444444;
      --text-muted: #6b6b6b;
      --border-light: #eae5dc;
      --shadow-sm: 0 10px 25px -12px rgba(0,0,0,0.06);
      --shadow-md: 0 20px 35px -15px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 30px;
      --transition: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
      margin: 0;
      padding: 0;
      background-color: var(--off-white);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    h1, h2, h3, h4 {
      margin: 0;
      color: var(--text-dark);
      font-weight: 400;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    
    /* 板块通用间距 */
    section {
      padding: 100px 0;
    }
    
    /* 导航与首屏联动 - 分屏布局 */
    .hero-wrapper {
      display: flex;
      min-height: 100vh;
      background-color: var(--white);
      position: relative;
    }
    
    .nav-side {
      width: 35%;
      background-color: var(--off-white);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 2.5rem 2.5rem 2rem 3rem;
      border-right: 1px solid var(--border-light);
      position: relative;
      z-index: 10;
    }
    
    .logo-area {
      font-size: 2rem;
      font-weight: 300;
      letter-spacing: 2px;
      color: var(--primary);
      margin-bottom: 3rem;
      line-height: 1.2;
    }
    .logo-area span {
      font-weight: 500;
      color: var(--accent);
    }
    
    .nav-links {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
    }
    
    .nav-links li a {
      font-size: 1.2rem;
      font-weight: 400;
      color: var(--text-body);
      position: relative;
      display: inline-block;
      padding-bottom: 4px;
      transition: color 0.2s;
      letter-spacing: 0.5px;
    }
    
    .nav-links li a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: width 0.25s ease;
    }
    
    .nav-links li a:hover {
      color: var(--primary);
    }
    .nav-links li a:hover::after {
      width: 100%;
    }
    
    .nav-footer-note {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 2rem;
      letter-spacing: 0.3px;
    }
    
    .hero-main {
      width: 65%;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 2rem;
    }
    
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.3);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: left;
      max-width: 600px;
      color: white;
      padding: 2rem;
    }
    
    .hero-content h1 {
      font-size: 4rem;
      font-weight: 300;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.02em;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    
    .hero-sub {
      font-size: 1.3rem;
      margin-bottom: 2.5rem;
      opacity: 0.95;
      font-weight: 300;
      color: #f0ede5;
    }
    
    .btn-accent {
      background-color: var(--accent);
      color: white;
      border: none;
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      font-weight: 500;
      letter-spacing: 0.8px;
      cursor: pointer;
      display: inline-block;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 8px 18px rgba(184,115,51,0.3);
    }
    .btn-accent:hover {
      background-color: #9c5e2c;
      box-shadow: 0 12px 22px rgba(184,115,51,0.4);
      color: white;
    }
    
    /* 汉堡菜单（移动端） */
    .mobile-nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--primary);
      cursor: pointer;
      position: absolute;
      top: 20px;
      right: 20px;
      z-index: 20;
    }
    
    /* 核心数据看板 */
    .dashboard-section {
      background-color: var(--dark-bg);
      color: #e0e0e0;
    }
    .stat-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 2rem;
    }
    .stat-card {
      text-align: center;
      flex: 1 1 200px;
    }
    .stat-number {
      font-size: 3.8rem;
      font-weight: 300;
      color: var(--accent-light);
      margin-bottom: 0.5rem;
    }
    .stat-label {
      font-size: 1.1rem;
      color: #ccc;
      letter-spacing: 1px;
    }
    
    /* 服务矩阵 不等高/交错 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2.5rem 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-light);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 1.5rem;
    }
    .service-title {
      font-size: 1.7rem;
      font-weight: 400;
      margin-bottom: 1rem;
      color: var(--text-dark);
    }
    .service-desc {
      color: var(--text-body);
      margin-bottom: 1.8rem;
      flex:1;
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: color 0.2s;
    }
    .text-link i {
      font-size: 0.9rem;
    }
    .text-link:hover {
      color: var(--accent);
    }
    
    /* 结果对比 */
    .compare-container {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .compare-left, .compare-right {
      flex: 1;
    }
    .compare-left h3 {
      color: #999;
      margin-bottom: 1.5rem;
    }
    .compare-right h3 {
      color: var(--primary);
      margin-bottom: 1.5rem;
    }
    .pain-list {
      list-style: none;
      padding: 0;
    }
    .pain-list li {
      margin-bottom: 1rem;
      color: #777;
      text-decoration: line-through;
    }
    .gain-list {
      list-style: none;
      padding: 0;
    }
    .gain-list li {
      margin-bottom: 1rem;
      color: var(--text-dark);
      font-weight: 500;
    }
    .gain-list i {
      color: var(--accent);
      margin-right: 10px;
    }
    
    /* FAQ */
    .faq-accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-question {
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      padding: 1.8rem 0;
      font-size: 1.25rem;
      font-weight: 500;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background-color: #faf8f5;
      border-radius: 8px;
      margin-bottom: 5px;
    }
    .accordion-answer p {
      padding: 1.2rem 1.5rem;
      margin: 0;
      color: var(--text-body);
    }
    .accordion-item.active .accordion-answer {
      max-height: 300px;
    }
    
    /* 联系CTA卡片 */
    .cta-card {
      background: linear-gradient(135deg, #004d40 0%, #1a5f53 100%);
      border-radius: 24px;
      padding: 4rem 3rem;
      color: white;
      text-align: center;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px 18px;
      margin-bottom: 18px;
      border-radius: 40px;
      border: none;
      background: rgba(255,255,255,0.9);
    }
    .btn-submit {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 45px;
      border-radius: 40px;
      font-weight: 600;
      cursor: pointer;
    }
    
    footer {
      background: #1a2a27;
      color: #aaa;
      padding: 2.5rem 0;
      text-align: center;
    }
    
    @media (max-width: 1024px) {
      .hero-wrapper {
        flex-direction: column;
      }
      .nav-side {
        width: 100%;
        flex-direction: row;
        padding: 1.2rem 2rem;
        align-items: center;
        border-right: none;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links {
        flex-direction: row;
        gap: 1.5rem;
      }
      .hero-main {
        width: 100%;
        min-height: 70vh;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-container {
        flex-direction: column;
      }
    }
    
    @media (max-width: 640px) {
      .container {
        padding: 0 20px;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        background: white;
        width: 100%;
        padding: 20px;
      }
      .mobile-nav-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 2.5rem;
      }
    }