/* roulang page: index */
:root {
      /* 主色与辅色 */
      --bs-primary: #E8815D;
      --bs-primary-deep: #D9704A;
      --bs-dark: #2D3E37;
      --bs-light-bg: #F7F3EF;
      --bs-gold: #C9A96E;
      --bs-text: #3A3A3A;
      --bs-border-light: #E8E0D8;
      --bs-white: #FFFFFF;
      --bs-card-shadow: 0 2px 12px rgba(45, 62, 55, 0.06);
      --bs-card-shadow-hover: 0 8px 24px rgba(45, 62, 55, 0.12);
      --bs-radius-lg: 12px;
      --bs-radius-md: 8px;
      --bs-radius-pill: 20px;
      --bs-font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --bs-transition: all 0.2s ease-in-out;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--bs-font-sans);
      background-color: var(--bs-light-bg);
      color: var(--bs-text);
      line-height: 1.8;
      letter-spacing: 0.01em;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 2.8rem;
      line-height: 1.25;
    }

    h2 {
      font-size: 2rem;
      position: relative;
      display: inline-block;
      margin-bottom: 1.5rem;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 4px;
      background-color: var(--bs-primary);
      border-radius: 2px;
    }

    .section-title-center h2::after {
      left: 50%;
      transform: translateX(-50%);
    }

    a {
      color: var(--bs-gold);
      text-decoration: none;
      transition: var(--bs-transition);
    }

    a:hover {
      color: var(--bs-primary-deep);
    }

    .container {
      max-width: 1200px;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--bs-primary);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--bs-radius-md);
      padding: 12px 28px;
      transition: var(--bs-transition);
      box-shadow: 0 2px 8px rgba(232, 129, 93, 0.3);
    }

    .btn-primary-custom:hover {
      background-color: var(--bs-primary-deep);
      color: white;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(232, 129, 93, 0.4);
    }

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--bs-dark);
      color: var(--bs-dark);
      font-weight: 600;
      border-radius: var(--bs-radius-md);
      padding: 12px 28px;
      transition: var(--bs-transition);
    }

    .btn-outline-custom:hover {
      background-color: #FDF0E8;
      border-color: var(--bs-primary);
      color: var(--bs-primary-deep);
    }

    .btn-lg-custom {
      padding: 16px 40px;
      font-size: 1.1rem;
    }

    /* 导航双层 */
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--bs-dark) !important;
      letter-spacing: 1px;
    }

    .navbar-brand-custom span {
      color: var(--bs-primary);
    }

    .top-bar {
      background-color: var(--bs-light-bg);
      height: 56px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--bs-border-light);
    }

    .channel-tabs {
      background-color: white;
      height: 48px;
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      border-bottom: 1px solid var(--bs-border-light);
      scrollbar-width: none;
      -ms-overflow-style: none;
    }

    .channel-tabs::-webkit-scrollbar {
      display: none;
    }

    .pill-nav {
      background: transparent;
      border: 1px solid var(--bs-border-light);
      color: var(--bs-dark);
      border-radius: 20px;
      padding: 6px 18px;
      font-weight: 600;
      font-size: 0.95rem;
      margin-right: 8px;
      transition: var(--bs-transition);
    }

    .pill-nav.active, .pill-nav:hover {
      background-color: var(--bs-dark);
      border-color: var(--bs-dark);
      color: white;
    }

    .sticky-header {
      position: sticky;
      top: 0;
      z-index: 1020;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border: none;
      border-radius: var(--bs-radius-lg);
      box-shadow: var(--bs-card-shadow);
      transition: var(--bs-transition);
      height: 100%;
    }

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

    .icon-circle {
      width: 48px;
      height: 48px;
      background-color: rgba(232, 129, 93, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bs-primary);
      font-size: 1.5rem;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }

    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }

    .case-card img {
      transition: transform 0.4s ease;
      border-radius: var(--bs-radius-lg) var(--bs-radius-lg) 0 0;
    }

    .case-card:hover img {
      transform: scale(1.03);
    }

    .badge-custom {
      background-color: var(--bs-light-bg);
      color: var(--bs-text);
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    /* 对比表 */
    .plan-card {
      background: white;
      border-radius: var(--bs-radius-lg);
      padding: 2rem;
      box-shadow: var(--bs-card-shadow);
      border: 1px solid transparent;
    }

    .plan-popular {
      border: 2px solid var(--bs-primary);
      position: relative;
      transform: scale(1.02);
    }

    .popular-badge {
      background: var(--bs-primary);
      color: white;
      font-weight: 600;
      font-size: 0.8rem;
      padding: 4px 16px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .faq-accordion .accordion-button {
      font-weight: 700;
      font-size: 1.1rem;
      color: var(--bs-dark);
      background-color: white;
      box-shadow: none;
      padding: 1.2rem 0;
      border-bottom: 1px solid var(--bs-border-light);
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      color: var(--bs-primary);
      background-color: transparent;
    }

    .faq-accordion .accordion-body {
      padding: 1rem 0 1.5rem;
      color: var(--bs-text);
      line-height: 1.9;
    }

    .cta-banner {
      background-color: var(--bs-dark);
      padding: 80px 0;
      border-radius: 24px;
      margin: 60px 0;
    }

    footer {
      background-color: var(--bs-dark);
      color: rgba(255,255,255,0.85);
    }

    footer a {
      color: rgba(255,255,255,0.75);
    }

    footer a:hover {
      color: var(--bs-gold);
    }

    @media (max-width: 992px) {
      .masonry-grid {
        column-count: 2;
      }
      h1 {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
      .hero-row {
        flex-direction: column-reverse;
      }
      .plan-popular {
        transform: none;
      }
      .channel-tabs {
        justify-content: flex-start;
      }
    }