/* roulang page: index */
:root {
      --yl-black: #1A1A1A;
      --yl-gold: #C8A96E;
      --yl-gold-hover: #B8995A;
      --bg-warm: #FAFAFA;
      --text-strong: #2C2C2C;
      --text-weak: #7D7D7D;
      --border-light: #E5E5E5;
      --card-bg: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
      --font-number: "Inter","SF Pro Display",sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-strong);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--yl-black);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 覆盖 Bootstrap 默认 */
    .btn:focus, .form-control:focus {
      box-shadow: 0 0 0 0.25rem rgba(200,169,110,0.25);
      outline: 2px solid var(--yl-gold);
      outline-offset: 2px;
    }
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--yl-gold);
      box-shadow: 0 0 0 0.2rem rgba(200,169,110,0.2);
    }
    /* 自定义容器微调 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    @media (min-width: 1400px) {
      .container-custom {
        max-width: 1280px;
      }
    }
    @media (max-width: 991px) {
      .container-custom {
        max-width: 720px;
      }
    }
    @media (max-width: 767px) {
      .container-custom {
        max-width: 540px;
      }
    }
    @media (max-width: 575px) {
      .container-custom {
        width: 100%;
        padding-left: 20px;
        padding-right: 20px;
      }
    }
    /* 导航 */
    .navbar-custom {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      position: sticky;
      top: 0;
      z-index: 1050;
      display: flex;
      align-items: center;
    }
    .logo-text {
      font-weight: 700;
      font-size: 22px;
      color: var(--yl-black);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    .logo-text::after {
      content: '';
      display: inline-block;
      width: 2px;
      height: 20px;
      background: var(--yl-gold);
      margin-left: 10px;
    }
    .search-box {
      width: 320px;
      background: #F5F5F5;
      border: 1px solid var(--border-light);
      border-radius: 40px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .search-box i {
      color: var(--text-weak);
      font-size: 14px;
      margin-right: 8px;
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      font-size: 14px;
      width: 100%;
      color: var(--yl-black);
    }
    .search-box input::placeholder {
      color: #B0B0B0;
    }
    .search-box:focus-within {
      background: #FFFFFF;
      border-color: var(--yl-gold);
    }
    .nav-links .nav-link-item {
      color: var(--text-strong);
      font-weight: 500;
      font-size: 15px;
      margin-left: 32px;
      position: relative;
      padding-bottom: 6px;
      transition: var(--transition);
    }
    .nav-link-item::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--yl-gold);
      transition: width 0.2s ease;
    }
    .nav-link-item:hover {
      color: var(--yl-gold);
    }
    .nav-link-item:hover::after {
      width: 100%;
    }
    @media (max-width: 768px) {
      .search-box {
        width: 100%;
        margin-bottom: 15px;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-link-item {
        margin: 8px 0;
      }
      .navbar-collapse-custom {
        background: white;
        padding: 20px;
        border-radius: 0 0 12px 12px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.05);
      }
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--yl-gold);
      color: var(--yl-black);
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      text-transform: uppercase;
      letter-spacing: 0.3px;
    }
    .btn-primary-custom:hover {
      background: var(--yl-gold-hover);
      color: var(--yl-black);
    }
    .btn-outline-custom {
      background: transparent;
      color: var(--yl-black);
      border: 1.5px solid var(--yl-black);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      text-transform: uppercase;
    }
    .btn-outline-custom:hover {
      background: var(--yl-black);
      color: #FFFFFF;
    }
    .btn-white-outline {
      border-color: #FFFFFF;
      color: #FFFFFF;
    }
    .btn-white-outline:hover {
      background: #FFFFFF;
      color: var(--yl-black);
    }
    /* 卡片 */
    .card-custom {
      background: var(--card-bg);
      border: 1px solid transparent;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--yl-gold);
    }
    /* 区块间距 */
    .section-padding {
      padding: 120px 0;
    }
    @media (max-width: 991px) {
      .section-padding {
        padding: 80px 0;
      }
    }
    @media (max-width: 575px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    /* Hero */
    .hero-image-placeholder {
      background: #E0E0E0;
      border-radius: 16px;
      width: 100%;
      height: 380px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 28px;
      color: var(--yl-gold);
    }
    /* 优势不对称栅格 */
    .advantage-large {
      border: 1px solid var(--yl-gold);
      background: #FFFFFF;
      border-radius: var(--radius-card);
    }
    .advantage-small {
      background: #F9F9F9;
      border-radius: var(--radius-card);
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .advantage-small:hover {
      border-color: var(--yl-gold);
    }
    /* 功能图文 */
    .feature-image {
      background: #F0F0F0;
      border-radius: 12px;
      aspect-ratio: 4/3;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* 场景卡片 */
    .scenario-card .card-img-top-placeholder {
      height: 180px;
      background: #E0E0E0;
      border-radius: 12px 12px 0 0;
      background-size: cover;
    }
    .scenario-card:hover {
      border-top: 3px solid var(--yl-gold);
    }
    /* 案例卡片 */
    .case-logo-placeholder {
      width: 60px;
      height: 60px;
      background: #E0E0E0;
      border-radius: 8px;
    }
    /* 价格卡片 */
    .pricing-popular {
      border: 2px solid var(--yl-gold);
      position: relative;
    }
    .badge-popular {
      background: var(--yl-gold);
      color: var(--yl-black);
      font-size: 12px;
      font-weight: 600;
      border-radius: 4px;
      padding: 4px 12px;
    }
    /* FAQ */
    .accordion-custom .accordion-item {
      border: 1px solid var(--border-light);
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .accordion-custom .accordion-button {
      font-weight: 500;
      font-size: 16px;
      color: var(--yl-black);
      background: #FFFFFF;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--yl-gold);
      border-color: var(--yl-gold);
    }
    /* CTA */
    .cta-block {
      background: var(--yl-black);
      padding: 80px 0;
    }
    /* Footer */
    .footer-custom {
      background: var(--yl-black);
      color: #B0B0B0;
      font-size: 14px;
    }
    .footer-custom a:hover {
      color: #FFFFFF;
    }
    .footer-links li {
      margin-bottom: 6px;
    }
    .divider {
      border-top: 1px solid #3A3A3A;
    }