/* roulang page: index */
:root {
      --primary: #FFB800;
      --primary-dark: #F0A000;
      --secondary: #1A5F7A;
      --bg-light: #F8FAFB;
      --bg-hero-start: #F0F6FF;
      --bg-hero-end: #FFF9F0;
      --text-dark: #1E293B;
      --text-mid: #475569;
      --text-light: #94A3B8;
      --success: #10B981;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.1);
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --font-h1: 2.25rem;
      --font-h2: 1.875rem;
      --font-h3: 1.25rem;
      --font-body: 1rem;
      --transition: 0.25s ease;
      --max-width: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      margin: 0;
      padding: 0;
      background-color: #FFFFFF;
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .grid-container {
      max-width: var(--max-width);
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #FFFFFF;
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 100;
      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;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      letter-spacing: -0.3px;
      text-decoration: none;
      display: flex;
      align-items: center;
    }

    .logo .lemon {
      color: var(--primary);
    }

    .logo .sport {
      color: var(--secondary);
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-mid);
      text-decoration: none;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-dark);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all var(--transition);
      text-decoration: none;
      cursor: pointer;
      border: none;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      padding: 0.75rem 1.75rem;
      box-shadow: 0 4px 12px rgba(255,184,0,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(240,160,0,0.3);
      color: #FFFFFF;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.65rem 1.75rem;
    }

    .btn-outline:hover {
      background: rgba(255,184,0,0.08);
      transform: translateY(-2px);
    }

    .btn-large {
      padding: 1rem 2.5rem;
      font-size: 1.125rem;
      border-radius: 10px;
    }

    .btn-white {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.6);
      color: #FFFFFF;
      padding: 0.9rem 2.5rem;
      font-weight: 600;
      border-radius: 10px;
      font-size: 1.1rem;
    }

    .btn-white:hover {
      background: #FFFFFF;
      color: var(--primary);
      border-color: #FFFFFF;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, var(--bg-hero-start) 0%, var(--bg-hero-end) 100%);
      min-height: 580px;
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }

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

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--text-dark);
      margin-bottom: 1.25rem;
    }

    .hero-text p {
      font-size: 1.125rem;
      color: var(--text-mid);
      line-height: 1.7;
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1;
      text-align: right;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: var(--radius-xl);
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
    }

    /* 板块通用 */
    .section {
      padding: 6.25rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      font-size: var(--font-h2);
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }

    .section-title h2::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--primary);
      margin: 0.5rem auto 0;
      border-radius: 3px;
    }

    .section-title p {
      color: var(--text-mid);
      font-size: 1.1rem;
    }

    .card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      padding: 1.75rem;
      transition: all var(--transition);
      height: 100%;
    }

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

    /* 价值主张卡片 */
    .value-card i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
      background: rgba(255,184,0,0.1);
      width: 70px;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }

    .value-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-img img {
      width: 100%;
      border-radius: var(--radius-lg);
      transition: transform 0.3s ease;
    }

    .feature-img img:hover {
      transform: scale(1.02);
    }

    .feature-text h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    .feature-list {
      list-style: none;
      padding: 0;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      margin-bottom: 0.8rem;
      color: var(--text-mid);
    }

    .feature-list i {
      color: var(--primary);
      font-size: 1.1rem;
    }

    .text-link {
      color: var(--primary-dark);
      font-weight: 600;
      text-decoration: none;
      margin-top: 0.5rem;
      display: inline-block;
    }

    /* 场景卡片 */
    .scenario-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      margin: -1.75rem -1.75rem 1.25rem -1.75rem;
    }

    /* 案例卡片 */
    .case-card {
      background: #F7FAFD;
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 1.8rem;
      display: flex;
      gap: 1.5rem;
      align-items: center;
      margin-bottom: 1.5rem;
    }

    .case-avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: #e0e7ef;
      flex-shrink: 0;
    }

    .case-quote {
      font-style: italic;
      font-size: 1rem;
      color: var(--text-dark);
      margin-bottom: 0.75rem;
    }

    .case-author {
      font-weight: 700;
      font-size: 0.9rem;
    }

    .case-role {
      color: var(--text-mid);
      font-size: 0.85rem;
    }

    /* 价格卡片 */
    .pricing-card {
      position: relative;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      padding: 2rem;
      text-align: center;
      transition: all 0.3s ease;
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.03);
      box-shadow: 0 10px 30px rgba(255,184,0,0.15);
    }

    .popular-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.25rem 1rem;
      border-radius: 20px;
    }

    .price {
      font-size: 2.7rem;
      font-weight: 800;
      color: var(--text-dark);
      margin: 1rem 0;
    }

    .price small {
      font-size: 1rem;
      font-weight: 400;
    }

    .pricing-features {
      list-style: none;
      padding: 0;
      text-align: left;
      margin: 1.5rem 0;
    }

    .pricing-features li {
      padding: 0.4rem 0;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .pricing-features i {
      color: var(--success);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-title {
      font-size: 1.125rem;
      font-weight: 600;
      padding: 1.2rem 1.25rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-dark);
      transition: 0.2s;
    }

    .accordion-title i {
      transition: transform 0.2s;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 1.25rem;
      border-left: 3px solid transparent;
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding: 0 1.25rem 1.25rem;
      border-left-color: var(--primary);
    }

    .accordion-item.active .accordion-title i {
      transform: rotate(45deg);
    }

    /* CTA 底部 */
    #cta {
      background: linear-gradient(135deg, #FFB800 0%, #FF8C00 100%);
      color: #FFFFFF;
      text-align: center;
      padding: 5rem 0;
    }

    /* 页脚 */
    .footer {
      background: #1A2332;
      color: #B0BEC5;
      padding: 4rem 0 1.5rem;
    }

    .footer a {
      color: #B0BEC5;
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .footer-logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 1rem;
    }

    .social-icons i {
      font-size: 1.4rem;
      margin-right: 1rem;
      background: #2A3441;
      width: 36px;
      height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      transition: 0.2s;
    }

    .social-icons i:hover {
      background: var(--primary);
      color: #1A2332;
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-image {
        text-align: center;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
      .section {
        padding: 3.5rem 0;
      }
      .hero-text h1 {
        font-size: 1.75rem;
      }
    }