/* Reset và các biến cơ bản */
    :root {
      --page-vn581-primary-color: #FFD700; /* Vàng */
      --page-vn581-secondary-color: #FFFFFF; /* Trắng */
      --page-vn581-background-color: #000000; /* Đen */
      --page-vn581-text-color: #FFFFFF;
      --page-vn581-accent-color: #FFD700;
      --page-vn581-border-radius: 8px;
    }

    .page-vn581 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-vn581-text-color);
      background-color: var(--page-vn581-background-color);
      overflow-x: hidden;
    }

    /* Các phần tử chung */
    .page-vn581__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    .page-vn581__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      text-align: center;
    }

    .page-vn581__section:nth-child(even) {
      background-color: #1a1a1a; /* Màu nền xen kẽ nhẹ */
    }

    .page-vn581__heading {
      color: var(--page-vn581-primary-color);
      font-size: 2.5em;
      margin-bottom: 20px;
      text-transform: uppercase;
      font-weight: bold;
    }

    .page-vn581__subheading {
      color: var(--page-vn581-secondary-color);
      font-size: 1.8em;
      margin-bottom: 15px;
    }

    .page-vn581__paragraph {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: var(--page-vn581-text-color);
    }

    .page-vn581__button {
      display: inline-block;
      background-color: var(--page-vn581-primary-color);
      color: var(--page-vn581-background-color);
      padding: 15px 30px;
      border-radius: var(--page-vn581-border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-vn581__button:hover {
      background-color: #FFC107; /* Vàng đậm hơn khi hover */
      transform: translateY(-2px);
    }

    .page-vn581__image {
      max-width: 100%;
      height: auto;
      border-radius: var(--page-vn581-border-radius);
      display: block;
      margin: 20px auto;
      object-fit: cover;
    }

    /* Hero Section */
    .page-vn581__hero-section {
      position: relative;
      padding-top: 120px; /* Desktop safe zone for fixed header */
      min-height: 500px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      background-color: var(--page-vn581-background-color); /* Fallback */
      overflow: hidden;
      margin-bottom: 0; /* No margin-bottom for hero */
    }

    .page-vn581__hero-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
    }

    .page-vn581__hero-image {
        width: 100%;
        max-width: 100%;
        height: auto;
        display: block;
        border-radius: 0; /* Hero image usually full width */
        object-fit: cover; /* Ensures image covers area without distortion */
    }

    .page-vn581__hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 10;
      width: 90%;
      max-width: 800px;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.6); /* Semi-transparent background for text */
      border-radius: var(--page-vn581-border-radius);
    }

    .page-vn581__hero-title {
      color: var(--page-vn581-primary-color);
      font-size: 3em;
      margin-bottom: 10px;
      line-height: 1.2;
    }

    .page-vn581__hero-description {
      color: var(--page-vn581-secondary-color);
      font-size: 1.3em;
      margin-bottom: 25px;
    }

    /* Floating CTA Button */
    .page-vn581__floating-cta {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      background-color: #FF0000; /* Đỏ nổi bật */
      color: #FFFFFF;
      padding: 12px 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);
      transition: background-color 0.3s ease, transform 0.2s ease;
      white-space: nowrap; /* Prevent text wrapping */
    }

    .page-vn581__floating-cta:hover {
      background-color: #CC0000;
      transform: translateX(-50%) translateY(-3px);
    }

    /* Game Categories Section */
    .page-vn581__game-categories {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-vn581__game-card {
      background-color: #1a1a1a;
      padding: 20px;
      border-radius: var(--page-vn581-border-radius);
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .page-vn581__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(255, 215, 0, 0.2);
    }

    .page-vn581__game-card-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-bottom: 15px;
    }

    .page-vn581__game-card-image {
      max-width: 100%;
      height: auto;
      border-radius: var(--page-vn581-border-radius);
      object-fit: cover;
      min-height: 200px; /* Ensure minimum size */
    }

    .page-vn581__game-card-title {
      color: var(--page-vn581-primary-color);
      font-size: 1.2em;
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-vn581__game-card-description {
      font-size: 0.9em;
      color: var(--page-vn581-text-color);
    }

    /* Step-by-step Guide */
    .page-vn581__guide-steps {
      display: flex;
      flex-direction: column;
      gap: 30px;
      margin-top: 30px;
    }

    .page-vn581__guide-step {
      display: flex;
      align-items: center;
      text-align: left;
      background-color: #1a1a1a;
      padding: 25px;
      border-radius: var(--page-vn581-border-radius);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    }

    .page-vn581__guide-step-number {
      font-size: 2em;
      font-weight: bold;
      color: var(--page-vn581-primary-color);
      margin-right: 20px;
      flex-shrink: 0;
      width: 40px;
    }

    .page-vn581__guide-step-content {
      flex-grow: 1;
    }

    .page-vn581__guide-step-title {
      color: var(--page-vn581-primary-color);
      font-size: 1.4em;
      margin-bottom: 10px;
    }

    .page-vn581__guide-step-description {
      font-size: 1em;
      color: var(--page-vn581-text-color);
    }

    .page-vn581__guide-step-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-left: 20px;
        flex-shrink: 0;
        max-width: 250px; /* Limit image width in guide */
    }

    .page-vn581__guide-step-image {
        max-width: 100%;
        height: auto;
        border-radius: var(--page-vn581-border-radius);
        object-fit: cover;
        min-height: 200px;
    }

    /* Promotions Section */
    .page-vn581__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-vn581__promo-card {
      background-color: #1a1a1a;
      padding: 25px;
      border-radius: var(--page-vn581-border-radius);
      text-align: left;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-vn581__promo-card-image-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-bottom: 15px;
    }

    .page-vn581__promo-card-image {
        max-width: 100%;
        height: auto;
        border-radius: var(--page-vn581-border-radius);
        object-fit: cover;
        min-height: 200px;
    }

    .page-vn581__promo-card-title {
      color: var(--page-vn581-primary-color);
      font-size: 1.3em;
      margin-bottom: 10px;
    }

    .page-vn581__promo-card-description {
      font-size: 1em;
      color: var(--page-vn581-text-color);
      margin-bottom: 15px;
    }

    .page-vn581__promo-card-button {
      background-color: var(--page-vn581-accent-color);
      color: var(--page-vn581-background-color);
      padding: 10px 20px;
      border-radius: var(--page-vn581-border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 1em;
      align-self: flex-start;
      transition: background-color 0.3s ease;
    }

    .page-vn581__promo-card-button:hover {
      background-color: #FFC107;
    }

    /* FAQ Section */
    .page-vn581__faq-list {
      margin-top: 30px;
      text-align: left;
    }

    .page-vn581__faq-item {
      background-color: #1a1a1a;
      margin-bottom: 10px;
      border-radius: var(--page-vn581-border-radius);
      overflow: hidden;
    }

    .page-vn581__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #2a2a2a;
      color: var(--page-vn581-primary-color);
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease;
    }

    .page-vn581__faq-question:hover {
      background-color: #3a3a3a;
    }

    .page-vn581__faq-question h3 {
      margin: 0;
      color: var(--page-vn581-primary-color);
      font-size: 1.1em;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-vn581__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      pointer-events: none; /* Prevent toggle from blocking click event */
      transition: transform 0.3s ease;
    }

    .page-vn581__faq-item.active .page-vn581__faq-toggle {
      transform: rotate(45deg); /* Change + to X or - */
    }

    .page-vn581__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      color: var(--page-vn581-text-color);
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      text-align: left;
    }

    .page-vn581__faq-item.active .page-vn581__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to show content */
      padding: 20px !important;
      opacity: 1;
    }

    /* Why Choose Section */
    .page-vn581__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-vn581__feature-card {
      background-color: #1a1a1a;
      padding: 25px;
      border-radius: var(--page-vn581-border-radius);
      text-align: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    .page-vn581__feature-icon-wrapper {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        box-sizing: border-box;
        margin-bottom: 15px;
    }

    .page-vn581__feature-icon {
        max-width: 100%;
        height: auto;
        min-height: 200px; /* Ensure minimum size */
        object-fit: cover;
        border-radius: var(--page-vn581-border-radius);
    }

    .page-vn581__feature-title {
      color: var(--page-vn581-primary-color);
      font-size: 1.2em;
      margin-bottom: 10px;
    }

    .page-vn581__feature-description {
      font-size: 0.95em;
      color: var(--page-vn581-text-color);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-vn581__hero-section {
        padding-top: 100px; /* Mobile safe zone */
        min-height: 400px;
      }

      .page-vn581__hero-title {
        font-size: 2em;
      }

      .page-vn581__hero-description {
        font-size: 1em;
      }

      .page-vn581__button {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-vn581__heading {
        font-size: 2em;
      }

      .page-vn581__subheading {
        font-size: 1.5em;
      }

      .page-vn581__paragraph {
        font-size: 1em;
      }

      .page-vn581__section {
        padding: 30px 15px;
      }

      .page-vn581__game-categories {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      }

      .page-vn581__guide-step {
        flex-direction: column;
        text-align: center;
      }

      .page-vn581__guide-step-number {
        margin-right: 0;
        margin-bottom: 15px;
      }

      .page-vn581__guide-step-image-wrapper {
        margin-left: 0;
        margin-top: 15px;
        max-width: 100%;
      }

      .page-vn581__promo-grid,
      .page-vn581__features-grid {
        grid-template-columns: 1fr;
      }

      .page-vn581__floating-cta {
        width: calc(100% - 40px);
        bottom: 15px;
        font-size: 1em;
        padding: 10px 15px;
      }

      /* Image responsive important rules */
      .page-vn581__hero-image,
      .page-vn581__game-card-image,
      .page-vn581__guide-step-image,
      .page-vn581__promo-card-image,
      .page-vn581__feature-icon {
        max-width: 100% !important;
        height: auto !important;
      }

      .page-vn581__hero-image-wrapper,
      .page-vn581__game-card-image-wrapper,
      .page-vn581__guide-step-image-wrapper,
      .page-vn581__promo-card-image-wrapper,
      .page-vn581__feature-icon-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }