/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-deep: #1A3A5C;
      --accent-gold: #C49A2B;
      --accent-gold-hover: #A8811F;
      --bg-light: #F7F9FC;
      --text-dark: #1E2A38;
      --text-muted: #5F6B7A;
      --card-bg: #FFFFFF;
      --border-light: #E4E9F0;
      --shadow-sm: 0 4px 20px rgba(26,58,92,0.06), 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(26,58,92,0.10), 0 2px 6px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-dock: 40px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    button, .button {
      cursor: pointer;
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* ----- 浮动Dock导航 ----- */
    .nav-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 1100px;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      box-shadow: 0 8px 28px rgba(26,58,92,0.08);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 28px;
      height: 64px;
      z-index: 99;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .nav-dock.scrolled {
      background: rgba(255, 255, 255, 0.96);
      box-shadow: 0 12px 32px rgba(26,58,92,0.12);
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep);
      letter-spacing: 0.02em;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-dark);
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition-smooth);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-deep);
      border-bottom-color: var(--accent-gold);
    }

    .btn-dock-cta {
      background: var(--accent-gold);
      color: white;
      padding: 10px 22px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      box-shadow: 0 4px 10px rgba(196,154,43,0.2);
      transition: var(--transition-smooth);
    }

    .btn-dock-cta:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.03);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
      padding: 0 12px;
    }

    /* 移动端导航菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 90px;
      left: 5%;
      width: 90%;
      background: white;
      border-radius: 24px;
      box-shadow: var(--shadow-hover);
      flex-direction: column;
      padding: 20px 0;
      z-index: 100;
      backdrop-filter: blur(20px);
      background: rgba(255,255,255,0.98);
    }

    .mobile-menu a {
      display: block;
      padding: 14px 28px;
      font-weight: 500;
      border-bottom: 1px solid var(--border-light);
      color: var(--text-dark);
    }

    .mobile-menu a:last-child {
      border-bottom: none;
    }

    /* ----- 通用板块样式 ----- */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 2.2rem;
      color: var(--primary-deep);
      margin-bottom: 0.75rem;
      letter-spacing: 0.02em;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto 3rem auto;
      text-align: center;
    }

    /* ----- Hero 首屏 ----- */
    #hero {
      padding-top: 140px;
      padding-bottom: 100px;
      background-color: var(--bg-light);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-content {
      flex: 1;
    }

    .hero-badge {
      display: inline-block;
      color: var(--accent-gold);
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.1em;
      background: rgba(196,154,43,0.08);
      padding: 6px 16px;
      border-radius: 30px;
      margin-bottom: 1.5rem;
    }

    h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3.4rem;
      line-height: 1.2;
      color: var(--primary-deep);
      letter-spacing: 0.02em;
      margin-bottom: 1.5rem;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 480px;
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-gold);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      box-shadow: 0 6px 18px rgba(196,154,43,0.25);
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.03);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary-deep);
      border: 1.5px solid var(--primary-deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }

    .btn-secondary:hover {
      background: var(--primary-deep);
      color: white;
    }

    .hero-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .hero-image img {
      width: 100%;
      object-fit: cover;
    }

    /* ----- 解决方案卡片 ----- */
    .cards-grid {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px 28px;
      flex: 1 1 280px;
      max-width: 350px;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
      display: flex;
      flex-direction: column;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(196,154,43,0.2);
    }

    .icon-placeholder {
      font-size: 2.4rem;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
    }

    .solution-card h3 {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 1.5rem;
      margin-bottom: 1rem;
      color: var(--primary-deep);
    }

    .solution-card p {
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      flex: 1;
    }

    .text-link {
      color: var(--accent-gold);
      font-weight: 600;
      font-size: 0.95rem;
      align-self: flex-start;
    }

    .highlight-card {
      border-left: 4px solid var(--accent-gold);
      background: #FFF9ED;
    }

    /* ----- 数据成果 ----- */
    #results {
      background: rgba(26,58,92,0.03);
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      text-align: center;
    }

    .stat-item h3 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    .stat-item p {
      color: var(--text-muted);
      font-weight: 500;
    }

    /* ----- 客户证言 ----- */
    .testimonial-grid {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      flex: 1 1 300px;
      max-width: 380px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-gold);
      font-style: italic;
    }

    .testimonial-text {
      color: var(--text-dark);
      margin-bottom: 1.5rem;
      font-size: 1rem;
    }

    .client-name {
      font-weight: 700;
      color: var(--primary-deep);
    }

    .client-role {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.5rem;
    }

    .faq-question {
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      padding: 18px 8px;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--primary-deep);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-icon {
      transition: transform 0.2s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFD;
      border-radius: 8px;
      margin-bottom: 8px;
    }

    .faq-answer p {
      padding: 16px;
      color: var(--text-muted);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* ----- CTA 区块 ----- */
    #cta {
      background: var(--primary-deep);
      color: white;
      text-align: center;
    }

    #cta .section-title {
      color: white;
    }

    .cta-sub {
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }

    /* ----- 页脚 ----- */
    footer {
      background: #1E2A38;
      color: #B0BEC5;
      padding: 50px 0 25px;
    }

    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: space-between;
    }

    .footer-col {
      flex: 1 1 180px;
    }

    .footer-logo {
      font-weight: 700;
      font-size: 1.3rem;
      color: white;
      margin-bottom: 1rem;
    }

    .footer-links a {
      display: block;
      color: #B0BEC5;
      margin-bottom: 0.5rem;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    /* ----- 响应式设计 ----- */
    @media (max-width: 1024px) {
      h1 {
        font-size: 2.8rem;
      }
      .hero-grid {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .btn-dock-cta {
        display: none;
      }
      .mobile-menu.show {
        display: flex;
      }
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 2.2rem;
      }
      .cards-grid, .testimonial-grid {
        flex-direction: column;
        align-items: center;
      }
    }

    @media (max-width: 520px) {
      .nav-dock {
        padding: 0 16px;
      }
      .hero-buttons .btn-primary,
      .hero-buttons .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }