/* CSS cho trang vf555 */
    :root {
      --page-vf555-primary: hsl(210, 80%, 25%); /* Dark Blue */
      --page-vf555-secondary: hsl(45, 100%, 50%); /* Gold/Yellow */
      --page-vf555-accent: hsl(120, 60%, 40%); /* Green for success/highlight */
      --page-vf555-text-dark: hsl(0, 0%, 15%);
      --page-vf555-text-light: hsl(0, 0%, 98%);
      --page-vf555-bg-light: hsl(0, 0%, 98%);
      --page-vf555-bg-dark: hsl(210, 80%, 15%);
      --page-vf555-border-color: hsl(210, 20%, 80%);
      --page-vf555-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      --page-vf555-radius: 8px;
    }

    .page-vf555 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-vf555-text-dark);
      background-color: var(--page-vf555-bg-light);
    }

    .page-vf555 h1, .page-vf555 h2, .page-vf555 h3, .page-vf555 h4 {
      color: var(--page-vf555-primary);
      margin-bottom: 0.8em;
      line-height: 1.2;
    }

    .page-vf555 h1 { font-size: 2.2em; text-align: center; }
    .page-vf555 h2 { font-size: 1.8em; }
    .page-vf555 h3 { font-size: 1.4em; }

    .page-vf555 section {
      padding: 2.5em 1em;
      margin: 0 auto;
      max-width: 1200px;
    }
    .page-vf555 section:nth-of-type(even) {
      background-color: var(--page-vf555-bg-dark);
      color: var(--page-vf555-text-light);
    }
    .page-vf555 section:nth-of-type(even) h1,
    .page-vf555 section:nth-of-type(even) h2,
    .page-vf555 section:nth-of-type(even) h3,
    .page-vf555 section:nth-of-type(even) h4 {
      color: var(--page-vf555-secondary);
    }

    .page-vf555__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1em;
    }

    /* Hero Section */
    .page-vf555__hero {
      background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('[GALLERY:banner:vf555,hero,trangchu]') center center/cover no-repeat;
      color: var(--page-vf555-text-light);
      text-align: center;
      padding: 4em 1em;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 60vh;
      position: relative;
    }

    .page-vf555__hero-content {
      max-width: 800px;
      z-index: 2;
    }

    .page-vf555__hero h1 {
      color: var(--page-vf555-secondary);
      font-size: 2.5em;
      margin-bottom: 0.5em;
    }
    .page-vf555__hero p {
      font-size: 1.1em;
      margin-bottom: 1.5em;
      color: var(--page-vf555-text-light);
    }

    .page-vf555__button {
      display: inline-block;
      background-color: var(--page-vf555-secondary);
      color: var(--page-vf555-text-dark);
      padding: 0.8em 1.8em;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
      margin: 0.5em;
    }

    .page-vf555__button:hover {
      background-color: var(--page-vf555-accent);
      transform: translateY(-2px);
    }

    .page-vf555__button--primary {
      background-color: var(--page-vf555-accent);
      color: var(--page-vf555-text-light);
    }
    .page-vf555__button--primary:hover {
      background-color: var(--page-vf555-secondary);
      color: var(--page-vf555-text-dark);
    }

    /* Floating Button */
    .page-vf555__floating-btn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-vf555-accent);
      color: var(--page-vf555-text-light);
      padding: 0.8em 1.5em;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      box-shadow: var(--page-vf555-shadow);
      z-index: 1000;
      animation: pulse 2s infinite;
      display: flex;
      align-items: center;
      gap: 0.5em;
    }
    .page-vf555__floating-btn:hover {
      background-color: var(--page-vf555-primary);
    }
    .page-vf555__floating-btn span {
      font-size: 1.2em;
    }
    .page-vf555__floating-btn img {
        width: 24px;
        height: 24px;
        vertical-align: middle;
    }

    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    /* About Section */
    .page-vf555__about p {
      margin-bottom: 1em;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__about section:nth-of-type(even) p {
      color: var(--page-vf555-text-light);
    }

    /* Game Categories */
    .page-vf555__games-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5em;
      margin-top: 2em;
    }

    .page-vf555__game-card {
      background-color: var(--page-vf555-bg-light);
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__games section:nth-of-type(even) .page-vf555__game-card {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }

    .page-vf555__game-card:hover {
      transform: translateY(-5px);
    }

    .page-vf555__game-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .page-vf555__game-card-content {
      padding: 1.5em;
    }

    .page-vf555__game-card h3 {
      margin-top: 0;
      color: var(--page-vf555-primary);
    }
    .page-vf555__games section:nth-of-type(even) .page-vf555__game-card h3 {
      color: var(--page-vf555-secondary);
    }

    .page-vf555__game-card p {
      font-size: 0.9em;
      margin-bottom: 1em;
    }
    .page-vf555__game-card a {
      color: var(--page-vf555-accent);
      text-decoration: none;
      font-weight: bold;
    }
    .page-vf555__game-card a:hover {
      text-decoration: underline;
    }

    /* Guide Section */
    .page-vf555__guide-steps {
      display: flex;
      flex-direction: column;
      gap: 2em;
      margin-top: 2em;
    }

    .page-vf555__guide-step {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      background-color: var(--page-vf555-bg-light);
      padding: 1.5em;
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
    }
    .page-vf555__guide section:nth-of-type(even) .page-vf555__guide-step {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }
    .page-vf555__guide section:nth-of-type(even) .page-vf555__guide-step h3 {
      color: var(--page-vf555-secondary);
    }


    .page-vf555__guide-step img {
      max-width: 100%;
      height: auto;
      border-radius: var(--page-vf555-radius);
      margin-bottom: 1em;
      border: 1px solid var(--page-vf555-border-color);
    }

    .page-vf555__app-download {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1.5em;
        margin-top: 2em;
    }
    .page-vf555__qr-codes {
        display: flex;
        flex-direction: column;
        gap: 1em;
    }
    .page-vf555__qr-codes img {
        width: 120px;
        height: 120px;
        border: 2px solid var(--page-vf555-primary);
        border-radius: var(--page-vf555-radius);
    }
    .page-vf555__guide section:nth-of-type(even) .page-vf555__qr-codes img {
        border-color: var(--page-vf555-secondary);
    }

    /* Promotions Section */
    .page-vf555__promotions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5em;
      margin-top: 2em;
    }

    .page-vf555__promo-card {
      background-color: var(--page-vf555-bg-light);
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__promotions section:nth-of-type(even) .page-vf555__promo-card {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }

    .page-vf555__promo-card:hover {
      transform: translateY(-5px);
    }

    .page-vf555__promo-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }

    .page-vf555__promo-card-content {
      padding: 1.5em;
    }

    .page-vf555__promo-card h3 {
      margin-top: 0;
      color: var(--page-vf555-primary);
    }
    .page-vf555__promotions section:nth-of-type(even) .page-vf555__promo-card h3 {
      color: var(--page-vf555-secondary);
    }

    .page-vf555__promo-card p {
      font-size: 0.9em;
      margin-bottom: 1em;
    }

    /* Why Choose Section */
    .page-vf555__why-choose-list {
      list-style: none;
      padding: 0;
      margin-top: 2em;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5em;
    }

    .page-vf555__why-choose-list li {
      background-color: var(--page-vf555-bg-light);
      padding: 1.5em;
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
      display: flex;
      align-items: flex-start;
      gap: 1em;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__why-choose section:nth-of-type(even) .page-vf555__why-choose-list li {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }


    .page-vf555__why-choose-list li::before {
      content: '✔';
      color: var(--page-vf555-accent);
      font-weight: bold;
      font-size: 1.2em;
      line-height: 1;
      margin-right: 0.5em;
    }

    /* News Section */
    .page-vf555__news-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5em;
      margin-top: 2em;
    }

    .page-vf555__article-card {
      background-color: var(--page-vf555-bg-light);
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
      overflow: hidden;
      transition: transform 0.3s ease;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__news section:nth-of-type(even) .page-vf555__article-card {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }


    .page-vf555__article-card:hover {
      transform: translateY(-5px);
    }

    .page-vf555__article-card img {
      width: 100%;
      height: 150px;
      object-fit: cover;
    }

    .page-vf555__article-card-content {
      padding: 1.5em;
    }

    .page-vf555__article-card h3 {
      margin-top: 0;
      font-size: 1.1em;
      color: var(--page-vf555-primary);
    }
    .page-vf555__news section:nth-of-type(even) .page-vf555__article-card h3 {
      color: var(--page-vf555-secondary);
    }

    .page-vf555__article-card h3 a {
      text-decoration: none;
      color: inherit;
    }
    .page-vf555__article-card h3 a:hover {
      text-decoration: underline;
    }

    .page-vf555__article-card p {
      font-size: 0.85em;
      color: var(--page-vf555-text-dark);
      margin-bottom: 0.8em;
    }
    .page-vf555__news section:nth-of-type(even) .page-vf555__article-card p {
      color: var(--page-vf555-text-light);
    }

    .page-vf555__article-card span {
      font-size: 0.75em;
      color: #666;
    }
    .page-vf555__news section:nth-of-type(even) .page-vf555__article-card span {
      color: #bbb;
    }

    /* FAQ Section */
    .page-vf555__faq-list {
      list-style: none;
      padding: 0;
      margin-top: 2em;
    }

    .page-vf555__faq-item {
      background-color: var(--page-vf555-bg-light);
      margin-bottom: 1em;
      border-radius: var(--page-vf555-radius);
      box-shadow: var(--page-vf555-shadow);
      overflow: hidden;
      color: var(--page-vf555-text-dark);
    }
    .page-vf555__faq section:nth-of-type(even) .page-vf555__faq-item {
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
    }

    .page-vf555__faq-question {
      padding: 1em 1.5em;
      cursor: pointer;
      font-weight: bold;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--page-vf555-primary);
    }
    .page-vf555__faq section:nth-of-type(even) .page-vf555__faq-question {
      color: var(--page-vf555-secondary);
    }

    .page-vf555__faq-question::after {
      content: '+';
      font-size: 1.5em;
      transition: transform 0.3s ease;
    }
    .page-vf555__faq-question.active::after {
      content: '-';
      transform: rotate(180deg);
    }

    .page-vf555__faq-answer {
      padding: 0 1.5em 1.5em;
      font-size: 0.95em;
      display: none; /* Hidden by default */
    }
    .page-vf555__faq-answer p {
      margin: 0;
    }

    /* Call to Action Section */
    .page-vf555__cta {
      text-align: center;
      background-color: var(--page-vf555-primary);
      color: var(--page-vf555-text-light);
      padding: 3em 1em;
      border-radius: var(--page-vf555-radius);
      margin: 2em auto;
      max-width: 900px;
    }
    .page-vf555__cta h2 {
      color: var(--page-vf555-secondary);
      margin-bottom: 0.8em;
    }
    .page-vf555__cta p {
      font-size: 1.1em;
      margin-bottom: 1.5em;
    }

    /* Responsive adjustments */
    @media (min-width: 768px) {
      .page-vf555 h1 { font-size: 3em; }
      .page-vf555 h2 { font-size: 2.2em; }
      .page-vf555__hero {
        padding: 6em 2em;
      }
      .page-vf555__floating-btn {
        bottom: 30px;
        right: 30px;
        padding: 1em 2em;
      }
      .page-vf555__guide-step {
          flex-direction: row;
          text-align: left;
          gap: 2em;
      }
      .page-vf555__guide-step:nth-child(even) {
          flex-direction: row-reverse;
      }
      .page-vf555__guide-step img {
          max-width: 40%;
      }
      .page-vf555__app-download {
          flex-direction: row;
          justify-content: center;
          align-items: flex-start;
      }
      .page-vf555__qr-codes {
          flex-direction: row;
      }
    }