/* roulang page: index */
:root {
      --yl-primary: #1A3A5C;
      --yl-accent: #C49A6C;
      --yl-accent-hover: #B0855A;
      --yl-bg: #F7F8FA;
      --yl-white: #FFFFFF;
      --yl-text-primary: #1A1A1A;
      --yl-text-body: #4A4A4A;
      --yl-text-muted: #7A7A7A;
      --yl-border: #EAECF0;
      --yl-card-bg: #FFFFFF;
      --yl-shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --yl-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
      --yl-radius-card: 12px;
      --yl-radius-btn: 8px;
      --yl-radius-input: 6px;
      --yl-font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --yl-font-number: "Inter", "Segoe UI", system-ui, -apple-system;
      --bs-primary: #1A3A5C;
      --bs-body-bg: #F7F8FA;
      --bs-border-radius: 0.5rem;
      --bs-btn-border-radius: 0.5rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--yl-font-heading);
      background-color: var(--yl-bg);
      color: var(--yl-text-body);
      line-height: 1.7;
      margin: 0;
      padding-top: 72px;
    }

    h1, h2, h3, h4 {
      font-family: var(--yl-font-heading);
      color: var(--yl-text-primary);
      font-weight: 700;
    }

    h1 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
    }

    h2 {
      font-size: 28px;
      line-height: 1.35;
      font-weight: 700;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }

    h4 {
      font-size: 18px;
      line-height: 1.5;
      font-weight: 600;
    }

    p {
      font-size: 16px;
      line-height: 1.7;
      color: var(--yl-text-body);
      max-width: 40rem;
    }

    .container {
      max-width: 1140px;
      padding-left: 24px;
      padding-right: 24px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .btn-yl-primary {
      background-color: var(--yl-accent);
      color: white;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--yl-radius-btn);
      border: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-yl-primary:hover {
      background-color: var(--yl-accent-hover);
      transform: translateY(-2px);
      color: white;
      box-shadow: 0 8px 18px rgba(180, 133, 90, 0.25);
    }

    .btn-yl-outline {
      background: transparent;
      border: 1px solid var(--yl-primary);
      color: var(--yl-primary);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--yl-radius-btn);
      transition: all 0.25s ease;
    }

    .btn-yl-outline:hover {
      background-color: var(--yl-primary);
      color: white;
      border-color: var(--yl-primary);
    }

    .card-yl {
      background: var(--yl-card-bg);
      border-radius: var(--yl-radius-card);
      box-shadow: var(--yl-shadow-sm);
      border: 1px solid var(--yl-border);
      padding: 32px;
      transition: all 0.3s ease;
      height: 100%;
    }

    .card-yl:hover {
      box-shadow: var(--yl-shadow-hover);
      transform: translateY(-3px);
      border-color: transparent;
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background-color: rgba(196, 154, 108, 0.12);
      color: var(--yl-accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      margin-bottom: 20px;
    }

    .accent-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--yl-accent);
      border-radius: 50%;
      margin-right: 12px;
    }

    .bg-light-yl {
      background-color: #E8EDF2;
    }

    .testimonial-card {
      background: #F9FAFB;
      border-radius: var(--yl-radius-card);
      padding: 28px;
      box-shadow: var(--yl-shadow-sm);
      position: relative;
      border-left: 4px solid var(--yl-accent);
      margin-bottom: 24px;
    }

    .accordion-button:not(.collapsed) {
      background-color: #F0F4F8;
      color: var(--yl-accent);
      font-weight: 600;
      box-shadow: none;
    }

    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--yl-border);
    }

    .accordion-item {
      border: 1px solid var(--yl-border);
      margin-bottom: 12px;
      border-radius: var(--yl-radius-card) !important;
      overflow: hidden;
    }

    .mega-panel {
      display: none;
      position: absolute;
      top: 72px;
      right: 60px;
      background: white;
      border-radius: 12px;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      padding: 24px;
      width: 600px;
      z-index: 1050;
      grid-template-columns: repeat(3,1fr);
      gap: 20px;
      border: 1px solid var(--yl-border);
    }

    .mega-trigger:hover .mega-panel,
    .mega-trigger.active .mega-panel {
      display: grid;
    }

    @media (max-width: 992px) {
      .mega-panel {
        width: 100%;
        right: 0;
        grid-template-columns: 1fr;
      }
    }

    footer {
      background-color: #152E4A;
      color: #B0C4D9;
    }

    footer a {
      color: #C8D9E8;
    }

    footer a:hover {
      color: white;
    }

    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 28px;
      }
      h2 {
        font-size: 24px;
      }
      .section-padding {
        padding: 60px 0;
      }
      .card-yl {
        padding: 24px;
      }
    }
    .navbar-brand strong {
      font-size: 1.4rem;
      letter-spacing: 0.5px;
    }
    .nav-link {
      color: var(--yl-text-body) !important;
      font-weight: 500;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--yl-primary) !important;
      border-bottom: 2px solid var(--yl-accent);
    }
    .navbar {
      background: white;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }