/* roulang page: index */
:root {
      --primary: #C8A96E;
      --primary-hover: #B89940;
      --secondary: #3A3C42;
      --accent: #E87A4D;
      --bg-warm: #FAF7F2;
      --white: #FFFFFF;
      --gray-light: #F3F4F6;
      --gray-mid: #9CA3AF;
      --text-main: #1F2937;
      --text-soft: #4B5563;
      --text-light: #F9FAFB;
      --border-light: rgba(58,60,66,0.08);
      --shadow-card: 0 10px 25px -5px rgba(58,60,66,0.08), 0 8px 10px -6px rgba(58,60,66,0.03);
      --shadow-hover: 0 20px 35px -10px rgba(58,60,66,0.15), 0 10px 15px -8px rgba(58,60,66,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 4px;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      color: inherit;
      text-decoration: none;
    }
    
    button, input {
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    @media (min-width: 1024px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    
    /* 导航自定义 */
    .nav-link {
      position: relative;
      font-weight: 500;
      transition: color 0.2s ease;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .nav-link.active {
      color: var(--primary);
    }
    
    /* 汉堡菜单动画 */
    .hamburger-line {
      transition: transform 0.3s ease, opacity 0.2s ease;
    }
    .menu-open .line-top {
      transform: translateY(8px) rotate(45deg);
    }
    .menu-open .line-middle {
      opacity: 0;
    }
    .menu-open .line-bottom {
      transform: translateY(-8px) rotate(-45deg);
    }
    
    /* 图片倾斜与遮罩 */
    .hero-image-wrapper {
      clip-path: polygon(3% 0%, 100% 0%, 97% 100%, 0% 100%);
      transform: rotate(-0.5deg);
      overflow: hidden;
      border-radius: var(--radius-img);
    }
    
    /* 案例卡片叠加效果 */
    .case-card {
      break-inside: avoid;
      margin-bottom: 1.5rem;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: var(--white);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .case-card:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .case-card .overlay {
      background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.1) 60%);
    }
    
    /* 手风琴样式 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.75rem;
    }
    .faq-arrow {
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    
    /* 方案对比装饰 */
    .comparison-arrow {
      background: var(--primary);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      box-shadow: 0 8px 18px rgba(200,169,110,0.3);
    }
    
    @media (max-width: 767px) {
      .hero-image-wrapper {
        clip-path: polygon(1% 0%, 100% 0%, 99% 100%, 0% 100%);
        transform: rotate(0deg);
      }
    }