/* roulang page: index */
:root {
      --brand-primary: #059669;
      --brand-primary-hover: #047857;
      --brand-secondary: #0284C7;
      --brand-dark: #0F172A;
      --brand-dark-card: #1E293B;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-body: #334155;
      --bg-light: #F8F9FA;
      --bg-white: #FFFFFF;
      --border-color: #E2E8F0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 25px -5px rgba(5, 150, 105, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.65;
      overflow-x: hidden;
    }

    /* 顶部提示条 */
    .top-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 悬浮胶囊导航栏 */
    .capsule-header {
      position: sticky;
      top: 16px;
      z-index: 1040;
      width: 100%;
      padding: 0 1rem;
    }

    .capsule-nav {
      max-width: 1240px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: 9999px;
      padding: 0.65rem 1.4rem;
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      transition: all 0.3s ease;
    }

    .brand-logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--brand-dark);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .brand-logo-badge {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--brand-primary);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
    }

    .nav-link-custom {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.45rem 0.9rem;
      border-radius: 9999px;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--brand-primary);
      background-color: rgba(5, 150, 105, 0.08);
    }

    /* 按钮重塑 */
    .btn-main {
      background-color: var(--brand-primary);
      color: #fff;
      font-weight: 600;
      border-radius: 9999px;
      padding: 0.65rem 1.6rem;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
      transition: all 0.25s ease;
      text-decoration: none;
    }

    .btn-main:hover {
      background-color: var(--brand-primary-hover);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(5, 150, 105, 0.35);
    }

    .btn-outline-main {
      border: 1.5px solid var(--border-color);
      background-color: transparent;
      color: var(--text-main);
      font-weight: 600;
      border-radius: 9999px;
      padding: 0.65rem 1.6rem;
      transition: all 0.25s ease;
      text-decoration: none;
    }

    .btn-outline-main:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      background-color: rgba(5, 150, 105, 0.05);
      transform: translateY(-2px);
    }

    /* 区域通用样式 */
    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    .section-alt {
      background-color: var(--bg-light);
    }

    .section-dark {
      background-color: var(--brand-dark);
      color: #F8FAFC;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      padding: 0.25rem 0.85rem;
      border-radius: 9999px;
      background-color: rgba(5, 150, 105, 0.1);
      color: var(--brand-primary);
      margin-bottom: 0.8rem;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 1rem;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto 2.5rem auto;
    }

    /* 首屏卡片堆叠 Hero */
    .hero-wrapper {
      position: relative;
      padding: 4.5rem 0 5.5rem 0;
      background: radial-gradient(circle at 80% 20%, rgba(5, 150, 105, 0.08) 0%, rgba(255, 255, 255, 0) 70%),
                  radial-gradient(circle at 10% 90%, rgba(2, 132, 197, 0.06) 0%, rgba(255, 255, 255, 0) 60%),
                  #ffffff;
      overflow: hidden;
    }

    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 1.35rem;
    }

    .hero-lead {
      font-size: 1.12rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      line-height: 1.75;
    }

    /* 卡片堆叠视觉容器 */
    .stacked-cards-box {
      position: relative;
      height: 480px;
      width: 100%;
    }

    .stack-card {
      position: absolute;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      background-color: #fff;
      overflow: hidden;
      transition: all 0.4s ease;
      border: 1px solid var(--border-color);
    }

    .stack-card-main {
      width: 82%;
      height: 380px;
      left: 9%;
      top: 40px;
      z-index: 3;
    }

    .stack-card-left {
      width: 70%;
      height: 320px;
      left: -2%;
      top: 90px;
      z-index: 2;
      opacity: 0.88;
      transform: rotate(-3deg);
    }

    .stack-card-right {
      width: 68%;
      height: 310px;
      right: -2%;
      top: 15px;
      z-index: 1;
      opacity: 0.85;
      transform: rotate(4deg);
    }

    .stacked-cards-box:hover .stack-card-main {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .stacked-cards-box:hover .stack-card-left {
      transform: rotate(-5deg) translateY(-4px);
    }

    .stacked-cards-box:hover .stack-card-right {
      transform: rotate(6deg) translateY(-4px);
    }

    /* 现代卡片与微交互 */
    .feature-card {
      background-color: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.85rem;
      height: 100%;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      border-color: rgba(5, 150, 105, 0.4);
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(5, 150, 105, 0.1);
      color: var(--brand-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.15rem;
      margin-bottom: 1.25rem;
    }

    /* 步骤轴卡片 */
    .step-node {
      position: relative;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.75rem 1.4rem;
      height: 100%;
      transition: all 0.3s ease;
    }

    .step-node:hover {
      border-color: var(--brand-secondary);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .step-number-tag {
      display: inline-block;
      font-weight: 800;
      font-size: 0.85rem;
      color: var(--brand-secondary);
      background: rgba(2, 132, 197, 0.1);
      padding: 0.2rem 0.6rem;
      border-radius: 6px;
      margin-bottom: 1rem;
    }

    /* 对比表格 */
    .vs-table-container {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .vs-table th, .vs-table td {
      padding: 1.15rem 1.25rem;
      vertical-align: middle;
      border-bottom: 1px solid var(--border-color);
    }

    .vs-table thead {
      background-color: #F8FAFC;
    }

    /* 手风琴折叠面板 */
    .accordion-item-modern {
      background-color: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 1rem;
      overflow: hidden;
    }

    .accordion-button-modern {
      font-weight: 700;
      color: var(--text-main);
      padding: 1.15rem 1.4rem;
      background: #fff;
      box-shadow: none !important;
    }

    .accordion-button-modern:not(.collapsed) {
      background-color: rgba(5, 150, 105, 0.04);
      color: var(--brand-primary);
    }

    /* 底部移动端固定转化浮条 */
    .mobile-float-cta {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 1050;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-top: 1px solid var(--border-color);
      padding: 0.6rem 1rem;
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0B1120;
      color: #94A3B8;
      font-size: 0.9rem;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid #1E293B;
    }

    .site-footer a {
      color: #CBD5E1;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .site-footer a:hover {
      color: var(--brand-primary);
    }

    /* 响应式调整 */
    @media (max-width: 991.98px) {
      .hero-h1 {
        font-size: 2.15rem;
      }
      .stacked-cards-box {
        margin-top: 2.5rem;
        height: 380px;
      }
      .stack-card-main {
        width: 90%;
        left: 5%;
        height: 300px;
      }
    }

    @media (max-width: 767.98px) {
      .section-padding {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .hero-h1 {
        font-size: 1.85rem;
      }
      .mobile-float-cta {
        display: flex;
        gap: 0.75rem;
      }
      body {
        padding-bottom: 60px;
      }
      .capsule-nav {
        border-radius: 16px;
        padding: 0.6rem 1rem;
      }
    }