/* roulang page: index */
:root {
      --bamboo-deep: #1B3A2D;
      --warm-white: #F7F4EF;
      --cinnabar: #E85D3F;
      --bamboo-green: #5B8C5A;
      --charcoal: #3A3A3A;
      --stone: #6B6B6B;
      --light-bamboo: #EDEAE4;
      --white: #FFFFFF;
      --border-light: #E8E5DF;
      --shadow-sm: 0 2px 12px rgba(27, 58, 45, 0.06);
      --shadow-hover: 0 8px 24px rgba(27, 58, 45, 0.12);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --radius-card: 12px;
      --radius-btn: 50px;
      --transition: 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--charcoal);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      line-height: 1.3;
      color: var(--bamboo-deep);
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1140px;
      padding-left: 20px;
      padding-right: 20px;
      margin-left: auto;
      margin-right: auto;
    }
    
    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--cinnabar);
      color: var(--warm-white);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      font-size: 1rem;
      border: none;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      line-height: 1.5;
      box-shadow: 0 4px 10px rgba(232, 93, 63, 0.2);
    }
    .btn-primary-custom:hover {
      background-color: #C94A2F;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(232, 93, 63, 0.3);
      color: var(--warm-white);
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--bamboo-deep);
      color: var(--bamboo-deep);
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline-custom:hover {
      background-color: rgba(27, 58, 45, 0.08);
      color: var(--bamboo-deep);
    }
    
    .btn-nav-cta {
      background-color: var(--cinnabar);
      color: var(--warm-white);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      transition: var(--transition);
    }
    .btn-nav-cta:hover {
      background-color: #C94A2F;
      color: var(--warm-white);
      transform: translateY(-1px);
    }
    
    /* 导航栏 */
    #header {
      background-color: var(--warm-white);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(6px);
      background-color: rgba(247, 244, 239, 0.92);
    }
    
    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--bamboo-deep);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand i {
      font-size: 1.8rem;
      color: var(--bamboo-deep);
    }
    
    .navbar-nav .nav-link {
      color: var(--charcoal);
      font-weight: 500;
      font-size: 0.95rem;
      margin-left: 32px;
      position: relative;
      padding: 8px 0;
    }
    .navbar-nav .nav-link.active {
      color: var(--bamboo-deep);
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background-color: var(--cinnabar);
      border-radius: 1px;
    }
    .navbar-nav .nav-link:hover {
      color: var(--bamboo-deep);
    }
    
    .navbar-toggler {
      border: none;
      color: var(--bamboo-deep);
      font-size: 1.5rem;
      padding: 4px;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    
    @media (max-width: 991.98px) {
      .navbar-collapse {
        background: rgba(27, 58, 45, 0.97);
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        backdrop-filter: blur(8px);
      }
      .navbar-nav {
        flex-direction: column;
        text-align: center;
        gap: 24px;
      }
      .navbar-nav .nav-link {
        color: var(--warm-white);
        font-size: 1.5rem;
        margin-left: 0;
      }
      .navbar-nav .nav-link.active::after {
        background-color: var(--cinnabar);
      }
      .btn-nav-cta {
        margin-top: 20px;
      }
    }
    
    /* Hero */
    #hero {
      background-color: var(--bamboo-deep);
      background-image: radial-gradient(circle at 20% 30%, rgba(91, 140, 90, 0.15) 0%, transparent 50%);
      padding: 120px 0 100px;
      color: var(--warm-white);
    }
    .hero-title {
      font-size: 3.8rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--warm-white);
    }
    .hero-sub {
      font-size: 1.15rem;
      color: rgba(247, 244, 239, 0.8);
      margin: 24px 0 32px;
    }
    .hero-img {
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      margin-top: 20px;
      width: 100%;
      height: auto;
    }
    @media (max-width: 768px) {
      #hero {
        padding: 80px 0 60px;
      }
      .hero-title {
        font-size: 2.4rem;
      }
    }
    
    /* 板块标题 */
    .section-title {
      font-size: 2.3rem;
      font-weight: 600;
      margin-bottom: 48px;
      color: var(--bamboo-deep);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
    }
    
    /* 卡片系统 */
    .feature-card, .scenario-card, .pricing-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .feature-card:hover, .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .icon-bamboo {
      font-size: 2.5rem;
      color: var(--bamboo-green);
      margin-bottom: 16px;
    }
    
    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--bamboo-green);
      line-height: 1.2;
    }
    
    /* 价格卡片特殊样式 */
    .pricing-highlight {
      background-color: var(--bamboo-deep);
      color: var(--warm-white);
      border: none;
    }
    .pricing-highlight .price-number {
      color: var(--warm-white);
    }
    .pricing-highlight .btn-primary-custom {
      background-color: var(--cinnabar);
    }
    .price-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--bamboo-deep);
    }
    
    /* FAQ */
    .accordion-button {
      background-color: var(--warm-white);
      color: var(--charcoal);
      font-weight: 500;
      font-size: 1.05rem;
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--bamboo-deep);
      box-shadow: none;
    }
    .accordion-button::after {
      display: none;
    }
    .accordion-button i {
      transition: transform 0.2s;
      color: var(--bamboo-green);
      margin-right: 12px;
    }
    .accordion-button:not(.collapsed) i {
      transform: rotate(45deg);
    }
    .accordion-body {
      padding: 16px 0 24px;
      color: var(--stone);
    }
    
    /* CTA底部 */
    #cta {
      background-color: var(--bamboo-deep);
      padding: 80px 0;
      color: var(--warm-white);
    }
    
    footer {
      background-color: var(--charcoal);
      color: rgba(247, 244, 239, 0.7);
      padding: 32px 0;
      font-size: 0.9rem;
    }
    footer a {
      color: rgba(247, 244, 239, 0.7);
    }
    footer a:hover {
      color: var(--warm-white);
    }
    
    .case-list-item {
      border-left: 3px solid var(--cinnabar);
      padding-left: 20px;
      margin-bottom: 24px;
    }