/* roulang page: index */
:root {
      --primary-purple: #6C3FAA;
      --primary-purple-deep: #5A2F8A;
      --accent-cyan: #00E5A0;
      --bg-warm-gray: #F5F3F0;
      --text-charcoal: #1E1B1A;
      --card-cream: #FFFAF5;
      --border-light: #E8E5E0;
      --search-bg: #F0EDE8;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --transition: 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-gray);
      color: var(--text-charcoal);
      line-height: 1.7;
      margin: 0;
      padding-top: 80px;
      overflow-x: hidden;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1140px;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 自定义按钮覆盖 */
    .btn-primary-custom {
      background-color: var(--primary-purple);
      color: var(--accent-cyan);
      border: none;
      border-radius: var(--radius-pill);
      padding: 12px 32px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary-custom:hover, .btn-primary-custom:focus {
      background-color: var(--primary-purple-deep);
      color: white;
      box-shadow: 0 0 15px rgba(108, 63, 170, 0.5);
      outline: none;
    }
    
    .btn-outline-custom {
      background: transparent;
      color: var(--primary-purple);
      border: 2px solid var(--primary-purple);
      border-radius: var(--radius-pill);
      padding: 10px 30px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary-purple);
      color: white;
      border-color: var(--primary-purple);
    }
    
    /* 导航栏 */
    .navbar {
      background-color: rgba(255, 250, 245, 0.98);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 15px rgba(0,0,0,0.05);
      padding: 0.8rem 0;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-purple);
      letter-spacing: 2px;
    }
    .logo-sub {
      font-size: 0.8rem;
      color: var(--text-charcoal);
      opacity: 0.7;
      display: block;
      margin-top: -5px;
    }
    .search-box {
      background: var(--search-bg);
      border-radius: var(--radius-pill);
      padding: 8px 20px;
      display: flex;
      align-items: center;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      width: 220px;
      font-size: 0.95rem;
      color: var(--text-charcoal);
    }
    .search-box input::placeholder {
      color: #9a8e84;
    }
    .search-box:focus-within {
      border-color: var(--primary-purple);
      background: white;
      box-shadow: 0 0 0 3px rgba(108,63,170,0.2);
    }
    .search-icon {
      color: var(--accent-cyan);
      font-size: 1.2rem;
      margin-left: 8px;
    }
    .nav-link {
      color: var(--text-charcoal) !important;
      font-weight: 500;
      margin: 0 10px;
      position: relative;
      transition: var(--transition);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: var(--transition);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary-purple);
    }
    
    /* Hero 区 */
    .hero-section {
      background: linear-gradient(105deg, var(--bg-warm-gray) 60%, rgba(108,63,170,0.15) 60%);
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-particle {
      position: absolute;
      width: 8px;
      height: 8px;
      background: var(--primary-purple);
      border-radius: 50%;
      opacity: 0.3;
      animation: float 6s infinite alternate;
    }
    @keyframes float {
      0% { transform: translateY(0px); opacity: 0.2; }
      100% { transform: translateY(-30px); opacity: 0.6; }
    }
    .hero-img {
      border-radius: 24px;
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
    }
    
    /* 区块通用 */
    .section-block {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-charcoal);
      margin-bottom: 1.5rem;
    }
    
    /* 解决方案不规则栅格 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card-custom {
      background: var(--card-cream);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-light);
      position: relative;
      overflow: hidden;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .card-custom::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(90deg, var(--primary-purple), var(--accent-cyan));
    }
    .icon-cyan {
      color: var(--accent-cyan);
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    
    /* 成果数据条 */
    .data-scroll {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding: 20px 0;
      scrollbar-width: thin;
    }
    .data-item {
      flex: 0 0 auto;
      min-width: 180px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .data-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    
    /* FAQ 手风琴覆盖 */
    .accordion-button:not(.collapsed) {
      background-color: var(--bg-warm-gray);
      color: var(--primary-purple);
      box-shadow: none;
      border-left: 4px solid var(--accent-cyan);
    }
    .accordion-button:focus {
      border-color: var(--primary-purple);
      box-shadow: none;
    }
    
    /* CTA 区 */
    .cta-full {
      background: var(--primary-purple);
      padding: 80px 0;
      position: relative;
    }
    .cta-particle {
      position: absolute;
      width: 6px;
      height: 6px;
      background: rgba(255,255,255,0.4);
      border-radius: 50%;
      animation: ctaFloat 8s infinite;
    }
    @keyframes ctaFloat {
      0% { transform: translateY(0) scale(1); opacity: 0.5; }
      50% { transform: translateY(-20px) scale(1.5); opacity: 0.8; }
      100% { transform: translateY(0) scale(1); opacity: 0.5; }
    }
    
    /* 页脚 */
    .footer-links a {
      color: var(--text-charcoal);
      opacity: 0.8;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--primary-purple);
      opacity: 1;
    }
    
    @media (max-width: 992px) {
      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      body {
        padding-top: 70px;
      }
      .hero-section {
        background: var(--bg-warm-gray);
        padding: 40px 0 60px;
      }
      .section-block {
        padding: 60px 0;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .search-box {
        width: 100%;
        margin: 10px 0;
      }
      .search-box input {
        width: 100%;
      }
    }