/* Reset và cơ bản */
    .page-by88 {
      font-family: 'Arial', sans-serif;
      background-color: #000;
      color: #FFF;
      line-height: 1.6;
      padding-bottom: 80px; /* Dành cho nút khuyến mãi nổi */
    }

    .page-by88__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-by88__section {
      padding: 40px 0;
    }

    .page-by88__heading-primary {
      font-size: 3em;
      text-align: center;
      color: #FFD700;
      margin-bottom: 20px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-by88__heading-secondary {
      font-size: 2.2em;
      text-align: center;
      color: #FFF;
      margin-bottom: 30px;
      position: relative;
      padding-bottom: 15px;
    }

    .page-by88__heading-secondary::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: #FFD700;
      border-radius: 2px;
    }

    .page-by88__text-center {
      text-align: center;
    }

    .page-by88__button {
      display: inline-block;
      background-color: #FFD700;
      color: #000;
      padding: 15px 30px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-by88__button:hover {
      background-color: #FFF;
      transform: translateY(-2px);
    }

    /* Hero Section */
    .page-by88__hero-section {
      background-color: #1a1a1a;
      padding-top: 150px; /* Safety padding for fixed header */
      padding-bottom: 40px;
      text-align: center;
      overflow: hidden; /* Ensure image doesn't overflow */
    }

    .page-by88__hero-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-bottom: 30px;
    }

    .page-by88__hero-image {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
        display: block; /* Remove extra space below image */
        margin: 0 auto;
    }

    .page-by88__hero-content {
      max-width: 800px;
      margin: 0 auto;
    }

    .page-by88__hero-subtitle {
      font-size: 1.5em;
      color: #FFF;
      margin-bottom: 25px;
    }

    /* About Section */
    .page-by88__about-section {
      background-color: #0d0d0d;
    }

    .page-by88__about-text {
      font-size: 1.1em;
      line-height: 1.8;
      margin-bottom: 20px;
      text-align: justify;
    }

    /* Games Section */
    .page-by88__games-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-by88__game-card {
      background-color: #1a1a1a;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      border: 1px solid #333;
    }

    .page-by88__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .page-by88__game-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
    }

    .page-by88__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-by88__game-content {
      padding: 20px;
    }

    .page-by88__game-title {
      font-size: 1.5em;
      color: #FFD700;
      margin-bottom: 10px;
    }

    .page-by88__game-description {
      font-size: 0.95em;
      color: #CCC;
    }

    /* Providers Section */
    .page-by88__providers-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
      justify-items: center;
      align-items: center;
    }

    .page-by88__provider-logo-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        text-align: center;
        background-color: #1a1a1a;
        padding: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }

    .page-by88__provider-logo {
      max-width: 120px;
      height: auto;
      display: block;
      margin: 0 auto;
      filter: grayscale(80%);
      transition: filter 0.3s ease;
    }

    .page-by88__provider-logo:hover {
        filter: grayscale(0%);
    }

    /* Promotions Section */
    .page-by88__promotions-section {
      background-color: #0d0d0d;
    }

    .page-by88__promotion-item {
      background-color: #1a1a1a;
      border-radius: 10px;
      padding: 25px;
      margin-bottom: 25px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      border-left: 5px solid #FFD700;
    }

    .page-by88__promotion-title {
      color: #FFD700;
      font-size: 1.8em;
      margin-bottom: 10px;
    }

    .page-by88__promotion-description {
      font-size: 1.1em;
      color: #CCC;
      margin-bottom: 15px;
    }

    /* Guide Section */
    .page-by88__guide-step {
      display: flex;
      align-items: center;
      background-color: #1a1a1a;
      border-radius: 10px;
      padding: 20px;
      margin-bottom: 20px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      flex-direction: column;
      text-align: center;
    }

    .page-by88__guide-icon {
      font-size: 3em;
      color: #FFD700;
      margin-bottom: 15px;
    }

    .page-by88__guide-content {
      flex: 1;
    }

    .page-by88__guide-title {
      color: #FFF;
      font-size: 1.6em;
      margin-bottom: 10px;
    }

    .page-by88__guide-text {
      color: #CCC;
      font-size: 1em;
    }

    .page-by88__guide-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-top: 20px;
    }

    .page-by88__guide-image {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }

    /* FAQ Section */
    .page-by88__faq-section {
      background-color: #0d0d0d;
    }

    .page-by88__faq-list {
        margin-top: 30px;
    }

    .page-by88__faq-item {
      background-color: #1a1a1a;
      margin-bottom: 15px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
      border: 1px solid #333;
    }

    .page-by88__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 20px;
      cursor: pointer;
      user-select: none;
      background-color: #2a2a2a;
      transition: background-color 0.3s ease;
    }

    .page-by88__faq-question:hover {
      background-color: #3a3a3a;
    }

    .page-by88__faq-question h3 {
      margin: 0;
      color: #FFD700;
      font-size: 1.2em;
      pointer-events: none; /* Prevent h3 from blocking click on parent */
    }

    .page-by88__faq-toggle {
      font-size: 1.8em;
      color: #FFD700;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click on parent */
    }

    .page-by88__faq-item.active .page-by88__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' or use '−' */
    }

    .page-by88__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      color: #CCC;
      font-size: 1em;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
    }

    .page-by88__faq-item.active .page-by88__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px !important;
      opacity: 1;
    }

    /* Contact Section */
    .page-by88__contact-section {
        background-color: #000;
        text-align: center;
    }
    .page-by88__contact-text {
        font-size: 1.1em;
        color: #CCC;
        margin-bottom: 20px;
    }

    /* Social Media Section */
    .page-by88__social-section {
        background-color: #0d0d0d;
        text-align: center;
    }

    .page-by88__social-list {
        list-style: none;
        padding: 0;
        margin: 0;
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .page-by88__social-item {
        background-color: #1a1a1a;
        color: #FFD700;
        padding: 10px 20px;
        border-radius: 25px;
        font-weight: bold;
        transition: background-color 0.3s ease, color 0.3s ease;
        font-size: 1.1em;
        border: 1px solid #333;
    }

    .page-by88__social-item:hover {
        background-color: #FFD700;
        color: #000;
    }

    /* Floating Promotion Button */
    .page-by88__floating-promo-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #FFD700;
      color: #000;
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      display: flex;
      align-items: center;
      gap: 10px;
      transition: transform 0.3s ease, background-color 0.3s ease;
      animation: page-by88__pulse 2s infinite;
      border: none;
      cursor: pointer;
    }

    .page-by88__floating-promo-button:hover {
      transform: scale(1.05);
      background-color: #FFF;
    }

    .page-by88__promo-icon {
        font-size: 1.5em;
        line-height: 1;
    }

    @keyframes page-by88__pulse {
      0% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(255, 215, 0, 0.3);
      }
      100% {
        transform: scale(1);
      }
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-by88__heading-primary {
        font-size: 2.5em;
      }

      .page-by88__heading-secondary {
        font-size: 1.8em;
      }

      .page-by88__hero-section {
        padding-top: 150px; /* Adjust for mobile fixed header */
      }

      .page-by88__hero-subtitle {
        font-size: 1.2em;
      }

      .page-by88__button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-by88__games-grid {
        grid-template-columns: 1fr;
      }

      .page-by88__providers-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
      }

      .page-by88__provider-logo {
        max-width: 100px;
      }

      .page-by88__guide-step {
        flex-direction: column;
        text-align: center;
      }

      .page-by88__guide-icon {
        margin-right: 0;
        margin-bottom: 15px;
      }

      .page-by88__faq-question h3 {
        font-size: 1.1em;
      }

      .page-by88__faq-answer {
        padding: 0 15px;
        font-size: 0.95em;
      }

      .page-by88__faq-item.active .page-by88__faq-answer {
        padding: 15px !important;
      }

      .page-by88__floating-promo-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.9em;
      }

      .page-by88__promo-icon {
        font-size: 1.2em;
      }
    }

    /* Image responsive optimization */
    .page-by88 img {
        max-width: 100%;
        height: auto;
        display: block; /* remove extra space below image */
    }
    .page-by88__hero-image-wrapper,
    .page-by88__game-image-wrapper,
    .page-by88__provider-logo-wrapper,
    .page-by88__guide-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
    }

    @media (max-width: 768px) {
        .page-by88 img {
            max-width: 100% !important;
            height: auto !important;
        }
        .page-by88__hero-image-wrapper,
        .page-by88__game-image-wrapper,
        .page-by88__provider-logo-wrapper,
        .page-by88__guide-image-wrapper {
            width: 100% !important;
            max-width: 100% !important;
            overflow: hidden !important;
            box-sizing: border-box !important;
        }
    }