/* roulang page: index */
:root {
      --primary-red: #E63946;
      --primary-red-hover: #C1121F;
      --primary-red-light: #FFE5E7;
      --secondary-steel: #1D3557;
      --secondary-steel-dark: #152B44;
      --body-text: #2B2B2B;
      --secondary-text: #6C757D;
      --light-bg: #F8F9FA;
      --border-light: #DEE2E6;
      --card-bg: #FFFFFF;
      --success-green: #2A9D8F;
      --warning-gold: #F4A261;
      --section-gap: 100px;
      --card-radius: 12px;
      --button-radius: 8px;
      --transition-fast: 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
      --container-max: 1200px;
      --nav-height: 76px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: #FFFFFF;
      color: var(--body-text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background var(--transition-fast), box-shadow var(--transition-fast);
      border-bottom: 1px solid transparent;
    }
    
    .navbar.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 20px rgba(0,0,0,0.08);
      border-bottom: 1px solid var(--border-light);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--secondary-steel);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    
    .logo i {
      color: var(--primary-red);
      font-size: 26px;
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      text-decoration: none;
      color: #495057;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition-fast);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary-red);
      transition: width var(--transition-fast);
    }
    
    .nav-links a:hover {
      color: var(--primary-red);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    
    .search-icon {
      color: #495057;
      font-size: 18px;
      cursor: default;
      transition: color var(--transition-fast);
    }
    
    .login-link {
      color: var(--secondary-steel);
      font-weight: 500;
      font-size: 15px;
      text-decoration: none;
    }
    
    .btn-sm {
      background: var(--primary-red);
      color: white;
      padding: 10px 22px;
      border-radius: var(--button-radius);
      font-weight: 600;
      font-size: 15px;
      text-decoration: none;
      transition: background var(--transition-fast), transform 0.2s;
      display: inline-block;
    }
    
    .btn-sm:hover {
      background: var(--primary-red-hover);
      transform: translateY(-1px);
    }
    
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--secondary-steel);
      background: none;
      border: none;
      cursor: pointer;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: white;
      box-shadow: -5px 0 30px rgba(0,0,0,0.1);
      z-index: 1100;
      padding: 30px 24px;
      transition: right 0.4s ease;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    
    .mobile-menu.active {
      right: 0;
    }
    
    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      color: var(--secondary-steel);
      text-decoration: none;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }
    
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.5);
      z-index: 1050;
      display: none;
    }
    
    .overlay.active {
      display: block;
    }
    
    /* Hero */
    #hero {
      padding: 160px 0 100px;
      background: #FFFFFF;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    
    .hero-text h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--secondary-steel);
      margin-bottom: 20px;
    }
    
    .hero-text p {
      font-size: 18px;
      color: var(--secondary-text);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--button-radius);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      letter-spacing: 0.5px;
      transition: all var(--transition-fast);
      display: inline-block;
    }
    
    .btn-primary:hover {
      background: var(--primary-red-hover);
      box-shadow: 0 8px 20px rgba(230,57,70,0.3);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--secondary-steel);
      border: 2px solid var(--secondary-steel);
      padding: 14px 32px;
      border-radius: var(--button-radius);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: all var(--transition-fast);
      display: inline-block;
    }
    
    .btn-outline:hover {
      background: var(--secondary-steel);
      color: white;
    }
    
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 16px;
      height: 420px;
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
    }
    
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(230,57,70,0.15) 0%, rgba(29,53,87,0.1) 100%);
    }
    
    /* 痛点区 */
    #painpoints {
      padding: var(--section-gap) 0;
      background: #F1F3F5;
    }
    
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--secondary-steel);
      margin-bottom: 48px;
      text-align: center;
    }
    
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    .pain-card {
      background: var(--card-bg);
      padding: 28px 24px;
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-fast);
      border: 1px solid #E9ECEF;
    }
    
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .icon-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-red-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-red);
      font-size: 22px;
      margin-bottom: 18px;
      transition: all var(--transition-fast);
    }
    
    .pain-card:hover .icon-circle {
      background: var(--primary-red);
      color: white;
    }
    
    .pain-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    
    .pain-card p {
      color: var(--secondary-text);
    }
    
    /* 解决方案 */
    #solutions {
      padding: var(--section-gap) 0;
      background: #FFFFFF;
    }
    
    .solution-row {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    
    .solution-row.reverse {
      grid-template-columns: 7fr 5fr;
    }
    
    .solution-text h2 {
      font-size: 28px;
      font-weight: 600;
      color: var(--secondary-steel);
      margin-bottom: 16px;
    }
    
    .solution-text p {
      color: var(--secondary-text);
      margin-bottom: 20px;
    }
    
    .feature-list {
      list-style: none;
    }
    
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--body-text);
    }
    
    .feature-list i {
      color: var(--success-green);
      font-size: 18px;
    }
    
    .solution-img {
      background-size: cover;
      background-position: center;
      border-radius: 12px;
      height: 320px;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-fast);
    }
    
    .solution-img:hover {
      transform: scale(1.02);
    }
    
    /* 成果区 */
    #results {
      padding: var(--section-gap) 0;
      background: linear-gradient(135deg, #F1F3F5 0%, #E9ECEF 100%);
      text-align: center;
    }
    
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    
    .stat-item .number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-red);
      margin-bottom: 8px;
    }
    
    .stat-label {
      color: var(--secondary-text);
      font-weight: 500;
    }
    
    /* 证言 */
    #testimonials {
      padding: var(--section-gap) 0;
      background: #FFFFFF;
    }
    
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .testimonial-card {
      background: #F8F9FA;
      border-left: 4px solid var(--primary-red);
      padding: 24px;
      border-radius: 8px;
    }
    
    .stars {
      color: var(--warning-gold);
      margin-bottom: 16px;
    }
    
    .quote {
      font-style: italic;
      color: var(--body-text);
      margin-bottom: 20px;
    }
    
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    
    .avatar {
      width: 44px;
      height: 44px;
      background: #DEE2E6;
      border-radius: 50%;
      background-image: url('/assets/images/coverpic/cover-3.webp');
      background-size: cover;
    }
    
    /* FAQ */
    #faq {
      padding: var(--section-gap) 0;
      background: #F8F9FA;
    }
    
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 18px 20px;
      cursor: pointer;
      border: 1px solid #E9ECEF;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--secondary-text);
      margin-top: 0;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    
    /* CTA */
    #cta {
      padding: 100px 0;
      background: var(--secondary-steel);
      text-align: center;
      color: white;
    }
    
    #cta h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }
    
    .btn-cta-large {
      background: var(--primary-red);
      color: white;
      padding: 18px 48px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 18px;
      text-decoration: none;
      display: inline-block;
      margin-top: 30px;
      transition: all var(--transition-fast);
    }
    
    .btn-cta-large:hover {
      background: #FF4D5A;
      transform: scale(1.03);
    }
    
    /* Footer */
    #footer {
      background: var(--secondary-steel);
      color: #CED4DA;
      padding: 60px 0 0;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      transition: color var(--transition-fast);
    }
    
    .social-icons i:hover {
      color: var(--primary-red);
    }
    
    .copyright {
      background: #152B44;
      text-align: center;
      padding: 20px;
      font-size: 14px;
    }
    
    /* 响应式 */
    @media (max-width: 992px) {
      .nav-links, .nav-right .search-icon, .nav-right .login-link {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-grid, .solution-row, .solution-row.reverse {
        grid-template-columns: 1fr;
      }
      .pain-grid, .testimonial-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    @media (max-width: 576px) {
      .hero-text h1 { font-size: 28px; }
      .section-title { font-size: 22px; }
    }