/* roulang page: index */
:root {
      --color-primary: #1E2A3A;
      --color-accent: #C8A96E;
      --color-accent-hover: #B8934F;
      --color-bg: #FAF7F2;
      --color-card-bg: #FFFFFF;
      --color-text-primary: #1E2A3A;
      --color-text-body: #4A4A4A;
      --color-text-muted: #7A7A7A;
      --color-border-light: #D4CFC7;
      --color-faq-bg: #F5F2ED;
      --shadow-card: 0 2px 12px rgba(30,42,58,0.06);
      --shadow-card-hover: 0 8px 24px rgba(30,42,58,0.12);
      --shadow-nav: 0 2px 16px rgba(0,0,0,0.04);
      --radius-card-lg: 16px;
      --radius-card-sm: 12px;
      --radius-btn: 8px;
      --radius-hero-img: 24px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-stack);
      background-color: var(--color-bg);
      color: var(--color-text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航卡片面板 */
    .nav-panel {
      background-color: var(--color-bg);
      border-radius: 0 0 var(--radius-card-lg) var(--radius-card-lg);
      box-shadow: var(--shadow-nav);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 0;
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .logo-icon {
      display: inline-block;
      width: 24px;
      height: 24px;
      background-color: var(--color-accent);
      border-radius: 50%;
      margin-right: 6px;
      vertical-align: middle;
      box-shadow: 0 0 0 2px rgba(200,169,110,0.3);
    }

    .nav-links {
      display: flex;
      gap: 0.5rem;
      align-items: center;
    }

    .nav-chip {
      background: #FFFFFF;
      border-radius: 8px;
      padding: 0.5rem 1rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--color-text-primary);
      transition: all 0.2s;
      white-space: nowrap;
    }

    .nav-chip:hover {
      color: var(--color-accent);
    }

    .btn-primary {
      background-color: var(--color-accent);
      color: var(--color-primary);
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      display: inline-block;
      text-align: center;
      letter-spacing: 0.5px;
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }

    .btn-primary:hover {
      background-color: var(--color-accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(30,42,58,0.08);
    }

    .btn-text {
      color: var(--color-primary);
      font-weight: 500;
      text-decoration: underline;
      text-underline-offset: 4px;
      transition: color 0.2s;
    }

    .btn-text:hover {
      color: var(--color-accent);
    }

    /* 区块间距 */
    section {
      scroll-margin-top: 90px;
    }

    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    .card {
      background: var(--color-card-bg);
      border-radius: var(--radius-card-lg);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      transition: all 0.25s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .solution-card-bottom-line {
      border-bottom: 2px solid var(--color-accent);
    }

    .badge-accent {
      background-color: var(--color-accent);
      color: white;
      font-weight: 700;
      border-radius: 20px;
      padding: 0.2rem 1rem;
      font-size: 0.9rem;
      display: inline-block;
    }

    .stats-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--color-accent);
      line-height: 1.2;
    }

    .testimonial-card {
      border-left: 4px solid var(--color-accent);
    }

    .faq-item {
      background: var(--color-card-bg);
      border-radius: var(--radius-card-sm);
      margin-bottom: 1rem;
      transition: 0.3s ease;
    }

    .faq-question {
      cursor: pointer;
      padding: 1.2rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--color-text-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      background: var(--color-faq-bg);
      border-left: 4px solid var(--color-accent);
      padding: 0 1.5rem;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 1rem 1.5rem;
    }

    .footer {
      background-color: var(--color-primary);
      color: var(--color-bg);
    }

    .footer a {
      color: #E0D7C6;
    }

    .footer a:hover {
      color: var(--color-accent);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0; right: 0;
        background: #FFFFFF;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
        justify-content: space-around;
        padding: 0.6rem 0.5rem;
        z-index: 50;
        border-radius: 20px 20px 0 0;
      }
      .mobile-nav a {
        font-size: 0.75rem;
        color: var(--color-text-primary);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .section-padding {
        padding-top: 3rem;
        padding-bottom: 3rem;
      }
    }

    @media (min-width: 769px) {
      .mobile-nav {
        display: none;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
    }