/* roulang page: index */
:root {
      --primary: #6C2BD9;
      --primary-dark: #4B1EA3;
      --secondary: #F72C5B;
      --secondary-light: #FF5A7A;
      --gradient-main: linear-gradient(135deg, #6C2BD9 0%, #A855F7 50%, #F72C5B 100%);
      --bg-light: #F9FAFB;
      --white: #FFFFFF;
      --text-dark: #111827;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --border-light: rgba(108, 43, 217, 0.12);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(108,43,217,0.12);
      --shadow-glow: 0 15px 35px rgba(108,43,217,0.2);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --radius-sm: 12px;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      color: var(--text-dark);
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 自定义容器微调 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* 标题装饰线 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 70px;
      height: 4px;
      background: var(--gradient-main);
      border-radius: 4px;
      margin: 12px auto 0;
    }
    .section-subtitle {
      color: var(--text-body);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }
    /* 按钮重置 */
    .btn-custom-primary {
      background: var(--gradient-main);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-pill);
      transition: var(--transition);
      box-shadow: 0 8px 18px rgba(108,43,217,0.25);
      display: inline-block;
      text-align: center;
    }
    .btn-custom-primary:hover {
      background: linear-gradient(135deg, #5A1FB8 0%, #9333EA 50%, #E0244A 100%);
      transform: scale(1.03);
      color: white;
      box-shadow: 0 12px 24px rgba(108,43,217,0.4);
    }
    .btn-custom-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-pill);
      transition: var(--transition);
    }
    .btn-custom-outline:hover {
      background: rgba(108,43,217,0.06);
      border-color: var(--secondary);
      color: var(--primary-dark);
    }
    /* 导航 */
    #mainNav {
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.85);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      transition: all 0.3s;
      padding: 0.8rem 0;
    }
    .navbar-scrolled {
      background: rgba(255,255,255,0.98) !important;
      box-shadow: 0 4px 18px rgba(0,0,0,0.06) !important;
      padding: 0.5rem 0 !important;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary) !important;
      letter-spacing: -0.5px;
    }
    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
    }
    .nav-cta-btn {
      background: var(--gradient-main);
      color: white !important;
      border-radius: 30px;
      padding: 0.5rem 1.6rem !important;
      font-weight: 600;
    }
    /* 移动端菜单全屏覆盖 */
    @media (max-width: 992px) {
      .navbar-collapse {
        background: white;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        z-index: 1050;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.3s;
      }
      .navbar-nav {
        text-align: center;
        font-size: 1.5rem;
        gap: 1.5rem;
      }
    }
    /* hero双栏 */
    #hero {
      background: var(--gradient-main);
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: white;
    }
    .hero-left .lead {
      color: rgba(255,255,255,0.9);
      font-size: 1.2rem;
      margin: 1.8rem 0;
    }
    .stat-badge {
      display: flex;
      gap: 2rem;
      margin: 2rem 0 2.2rem;
      flex-wrap: wrap;
    }
    .stat-item .number {
      font-size: 2rem;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #f0e7ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-item .label {
      color: rgba(255,255,255,0.75);
      font-size: 0.9rem;
    }
    .hero-right img {
      border-radius: 32px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.3);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    @media (max-width: 992px) {
      .hero-left h1 {
        font-size: 2.2rem;
      }
      #hero {
        text-align: center;
      }
      .stat-badge {
        justify-content: center;
      }
    }
    /* 卡片通用 */
    .feature-card, .case-card, .plan-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }
    .badge-soft {
      background: rgba(108,43,217,0.1);
      color: var(--primary);
      border-radius: 20px;
      padding: 0.25rem 1rem;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 案例瀑布 */
    .masonry-grid {
      column-count: 2;
      column-gap: 24px;
    }
    .masonry-grid .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      padding: 0;
      overflow: hidden;
    }
    .case-card img {
      aspect-ratio: 4/3;
      object-fit: cover;
      width: 100%;
    }
    .case-content {
      padding: 20px 24px;
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    /* 方案对比 */
    .plan-highlight {
      background: var(--gradient-main);
      color: white;
      transform: scale(1.03);
      box-shadow: var(--shadow-glow);
      position: relative;
      z-index: 2;
    }
    .plan-badge {
      background: var(--secondary);
      color: white;
      border-radius: 20px;
      padding: 0.2rem 1.2rem;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--primary);
      box-shadow: none;
      border-left: 4px solid var(--primary);
    }
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      border-left: 4px solid transparent;
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: var(--radius-md) !important;
      overflow: hidden;
    }
    /* 联系CTA */
    .cta-section {
      background: var(--gradient-main);
    }
    footer {
      background: #1E0A3C;
      color: #ccc;
    }
    footer a {
      color: #ccc;
    }
    footer a:hover {
      color: white;
    }
    .footer-brand {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
    }