/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary-green: #0FA958;
      --primary-green-hover: #0C8A47;
      --dark-charcoal: #1E1E1E;
      --warm-white: #FAFAF8;
      --accent-orange: #F85C3C;
      --text-title: #1E1E1E;
      --text-subtitle: #5A5A5A;
      --text-body: #3D3D3D;
      --text-light: #8A8A8A;
      --border-light: #E5E5E5;
      --bg-light-gray: #F3F3F0;
      --bg-faq: #F7F7F5;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.1);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Inter', 'SF Pro Text', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
      border: none;
      outline: none;
    }
    
    /* 容器 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航固定与阴影 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: white;
      z-index: 50;
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s ease;
    }
    
    .navbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--dark-charcoal);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .logo-text span {
      color: var(--primary-green);
      margin-right: 4px;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      font-weight: 500;
      color: var(--text-subtitle);
    }
    
    .nav-links a {
      position: relative;
      padding: 0.25rem 0;
      font-size: 1rem;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 0%;
      height: 3px;
      background: var(--primary-green);
      transition: width 0.3s ease;
      border-radius: 2px;
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .nav-links a:hover {
      color: var(--dark-charcoal);
    }
    
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--dark-charcoal);
      border-radius: 2px;
      transition: all 0.3s ease;
    }
    
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--warm-white);
      z-index: 60;
      padding: 24px;
      display: flex;
      flex-direction: column;
      transition: right 0.35s ease;
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu .close-btn {
      align-self: flex-end;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--dark-charcoal);
      margin-bottom: 32px;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
      color: var(--text-body);
      font-weight: 500;
    }
    
    /* Hero 背景图片处理 */
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      min-height: 360px;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.35);
    }
    
    /* 卡片hover动画 */
    .hover-card {
      transition: transform 0.25s ease, box-shadow 0.3s ease;
    }
    .hover-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-title);
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      padding: 8px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      background: var(--bg-faq);
      border-radius: 8px;
      padding: 0 16px;
      margin-top: 4px;
      color: var(--text-body);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-icon {
      color: var(--primary-green);
      font-size: 1.3rem;
      transition: transform 0.3s ease;
    }
    
    /* 自定义按钮 */
    .btn-primary {
      background: var(--primary-green);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-green-hover);
      transform: scale(1.02);
    }
    .btn-outline-light {
      background: white;
      color: var(--primary-green);
      border: 2px solid white;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      font-weight: 600;
    }
    .btn-outline-light:hover {
      background: transparent;
      color: white;
      border-color: white;
    }
    
    /* 响应式断点 */
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-visual { min-height: 280px; border-radius: 20px; }
    }