:root {
      --color-primary: #FFD700; /* Gold */
      --color-secondary: #00BFFF; /* Deep Sky Blue */
      --color-dark: #1a1a2e; /* Dark Blue/Purple */
      --color-dark-alt: #16213e;
      --color-text-light: #f0f0f0;
      --color-text-dark: #333;
      --color-accent: #e94560; /* Reddish pink */
      --color-border: rgba(255, 255, 255, 0.1);
      --spacing-small: 10px;
      --spacing-medium: 20px;
      --spacing-large: 40px;
      --border-radius: 8px;
    }

    /* Base styles for the page container */
    .page-666vn {
      font-family: 'Arial', sans-serif;
      background-color: var(--color-dark);
      color: var(--color-text-light);
      line-height: 1.6;
      overflow-x: hidden; /* Prevent horizontal scroll from fixed buttons */
    }

    .page-666vn__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--spacing-medium);
    }

    .page-666vn__section {
      padding: var(--spacing-large) 0;
      text-align: center;
    }

    .page-666vn__section--alt {
      background-color: var(--color-dark-alt);
    }

    .page-666vn__heading {
      font-size: 2.5em;
      color: var(--color-primary);
      margin-bottom: var(--spacing-medium);
      text-transform: uppercase;
    }

    .page-666vn__subheading {
      font-size: 1.8em;
      color: var(--color-secondary);
      margin-bottom: var(--spacing-small);
    }

    .page-666vn__text {
      font-size: 1.1em;
      margin-bottom: var(--spacing-medium);
      color: var(--color-text-light);
    }

    /* Hero Section */
    .page-666vn__hero-section {
      position: relative;
      padding: 10px 0 var(--spacing-large) 0; /* Small top padding for hero */
      background-color: var(--color-dark);
      overflow: hidden;
    }

    .page-666vn__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.3;
      z-index: 0;
    }

    .page-666vn__hero-content {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 500px;
      padding: var(--spacing-large) var(--spacing-medium);
    }

    .page-666vn__hero-title {
      font-size: 3.5em;
      color: var(--color-primary);
      margin-bottom: var(--spacing-small);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      text-align: center;
      line-height: 1.2;
    }

    .page-666vn__hero-description {
      font-size: 1.5em;
      color: var(--color-text-light);
      margin-bottom: var(--spacing-large);
      text-align: center;
      max-width: 800px;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    }

    .page-666vn__hero-cta-button {
      display: inline-block;
      background-color: var(--color-accent);
      color: var(--color-text-light);
      padding: var(--spacing-small) var(--spacing-medium);
      border-radius: var(--border-radius);
      text-decoration: none;
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .page-666vn__hero-cta-button:hover {
      background-color: #c4324d;
    }

    /* Floating Buttons */
    .page-666vn__floating-buttons {
      position: fixed;
      bottom: var(--spacing-medium);
      right: var(--spacing-medium);
      display: flex;
      flex-direction: column;
      gap: var(--spacing-small);
      z-index: 1000;
    }

    .page-666vn__floating-button {
      background-color: var(--color-primary);
      color: var(--color-dark);
      padding: var(--spacing-small) var(--spacing-medium);
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      transition: background-color 0.3s ease, transform 0.2s ease;
      min-width: 120px;
    }

    .page-666vn__floating-button:hover {
      background-color: #e6c200;
      transform: translateY(-2px);
    }

    /* Product Grid */
    .page-666vn__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--spacing-medium);
      margin-top: var(--spacing-large);
    }

    .page-666vn__product-card {
      background-color: var(--color-dark-alt);
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-666vn__product-card:hover {
      transform: translateY(-5px);
    }

    .page-666vn__product-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      max-width: 100%; /* Responsive image */
      height: auto; /* Responsive image */
      box-sizing: border-box; /* Responsive image container */
    }

    .page-666vn__product-content {
      padding: var(--spacing-medium);
    }

    .page-666vn__product-title {
      font-size: 1.4em;
      color: var(--color-primary);
      margin-bottom: var(--spacing-small);
    }

    .page-666vn__product-description {
      font-size: 0.95em;
      color: var(--color-text-light);
    }

    /* Promotions Section */
    .page-666vn__promotion-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: var(--spacing-medium);
      margin-top: var(--spacing-large);
    }

    .page-666vn__promotion-card {
      background-color: var(--color-dark-alt);
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      text-align: left;
      transition: transform 0.3s ease;
    }

    .page-666vn__promotion-card:hover {
      transform: translateY(-5px);
    }

    .page-666vn__promotion-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      max-width: 100%; /* Responsive image */
      height: auto; /* Responsive image */
      box-sizing: border-box; /* Responsive image container */
    }

    .page-666vn__promotion-content {
      padding: var(--spacing-medium);
    }

    .page-666vn__promotion-title {
      font-size: 1.3em;
      color: var(--color-primary);
      margin-bottom: var(--spacing-small);
    }

    .page-666vn__promotion-description {
      font-size: 0.9em;
      color: var(--color-text-light);
      margin-bottom: var(--spacing-small);
    }

    .page-666vn__promotion-button {
      display: inline-block;
      background-color: var(--color-secondary);
      color: var(--color-dark);
      padding: var(--spacing-small) var(--spacing-medium);
      border-radius: var(--border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 0.9em;
      transition: background-color 0.3s ease;
    }

    .page-666vn__promotion-button:hover {
      background-color: #009acd;
    }

    /* Why Choose Section */
    .page-666vn__feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: var(--spacing-medium);
      margin-top: var(--spacing-large);
    }

    .page-666vn__feature-item {
      background-color: var(--color-dark-alt);
      padding: var(--spacing-medium);
      border-radius: var(--border-radius);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      text-align: center;
    }

    .page-666vn__feature-icon {
      width: 200px; /* Enforce min 200x200 */
      height: 200px; /* Enforce min 200x200 */
      object-fit: contain; /* Ensure image scales correctly within 200x200 */
      margin: 0 auto var(--spacing-small) auto;
      color: var(--color-primary); /* Fallback color if image fails */
      max-width: 100%; /* Responsive image */
      height: auto; /* Responsive image */
      box-sizing: border-box; /* Responsive image container */
    }

    .page-666vn__feature-title {
      font-size: 1.2em;
      color: var(--color-secondary);
      margin-bottom: var(--spacing-small);
    }

    .page-666vn__feature-description {
      font-size: 0.9em;
      color: var(--color-text-light);
    }

    /* Payment/Providers Section */
    .page-666vn__payment-providers-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: var(--spacing-small);
        margin-top: var(--spacing-medium);
        justify-content: center;
        align-items: center;
    }

    .page-666vn__payment-item,
    .page-666vn__provider-item {
        background-color: var(--color-dark-alt);
        padding: var(--spacing-small);
        border-radius: var(--border-radius);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        min-height: 100px;
    }

    .page-666vn__payment-image,
    .page-666vn__provider-image {
        width: 200px; /* Enforce min 200x200 */
        height: 100px; /* Height can be smaller if aspect ratio demands, but placeholder is WxH */
        object-fit: contain;
        margin-bottom: var(--spacing-small);
        max-width: 100%; /* Responsive image */
        height: auto; /* Responsive image */
        box-sizing: border-box; /* Responsive image container */
    }
    .page-666vn__payment-name,
    .page-666vn__provider-name {
        font-size: 0.9em;
        color: var(--color-text-light);
        font-weight: bold;
    }


    /* FAQ Section */
    .page-666vn__faq-list {
      margin-top: var(--spacing-large);
      text-align: left;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-666vn__faq-item {
      background-color: var(--color-dark-alt);
      border-radius: var(--border-radius);
      margin-bottom: var(--spacing-small);
      overflow: hidden;
    }

    .page-666vn__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: var(--spacing-medium);
      cursor: pointer;
      user-select: none;
      background-color: rgba(255, 255, 255, 0.05);
      transition: background-color 0.3s ease;
    }

    .page-666vn__faq-question:hover {
      background-color: rgba(255, 255, 255, 0.1);
    }

    .page-666vn__faq-question-title {
      font-size: 1.2em;
      color: var(--color-primary);
      margin: 0;
      pointer-events: none; /* Prevents click on text from blocking parent click */
    }

    .page-666vn__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--color-secondary);
      margin-left: var(--spacing-small);
      pointer-events: none; /* Prevents click on icon from blocking parent click */
      transition: transform 0.3s ease;
    }

    .page-666vn__faq-item.active .page-666vn__faq-toggle {
      transform: rotate(45deg); /* Plus to Minus visual */
    }

    .page-666vn__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 var(--spacing-medium);
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: var(--color-text-light);
      font-size: 1em;
      text-align: left;
    }

    .page-666vn__faq-item.active .page-666vn__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: var(--spacing-medium) !important;
      opacity: 1;
    }

    /* Footer-like content */
    .page-666vn__contact-info {
        padding: var(--spacing-large) 0;
        background-color: var(--color-dark-alt);
        text-align: center;
        color: var(--color-text-light);
    }
    .page-666vn__contact-text {
        font-size: 1em;
        margin-bottom: var(--spacing-small);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-666vn__container {
        padding: 0 var(--spacing-small);
      }

      .page-666vn__heading {
        font-size: 2em;
      }

      .page-666vn__subheading {
        font-size: 1.5em;
      }

      .page-666vn__hero-title {
        font-size: 2.5em;
      }

      .page-666vn__hero-description {
        font-size: 1.2em;
      }

      .page-666vn__hero-content {
        min-height: 400px;
        padding: var(--spacing-large) var(--spacing-small);
      }

      .page-666vn__floating-buttons {
        flex-direction: row;
        width: calc(100% - 2 * var(--spacing-small));
        left: var(--spacing-small);
        right: var(--spacing-small);
        bottom: var(--spacing-small);
        justify-content: space-around;
      }

      .page-666vn__floating-button {
        flex: 1;
        min-width: unset;
        font-size: 0.9em;
        padding: var(--spacing-small);
      }

      .page-666vn__product-grid,
      .page-666vn__promotion-grid,
      .page-666vn__feature-grid {
        grid-template-columns: 1fr;
      }
      .page-666vn__product-card,
      .page-666vn__promotion-card,
      .page-666vn__feature-item {
        margin: 0 auto;
        width: 100% !important;
        max-width: 400px !important; /* Constrain width for single column to not be too wide */
        box-sizing: border-box !important;
      }
      .page-666vn__product-image,
      .page-666vn__promotion-image,
      .page-666vn__feature-icon,
      .page-666vn__payment-image,
      .page-666vn__provider-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      /* List items responsive */
      .page-666vn__payment-providers-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)) !important; /* Allow more items per row if space, but narrow them */
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }
      .page-666vn__payment-item,
      .page-666vn__provider-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: var(--spacing-small) !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
      .page-666vn__payment-name,
      .page-666vn__provider-name {
          font-size: 0.85em;
      }

      .page-666vn__faq-list {
        padding: 0 var(--spacing-small);
      }

      .page-666vn__faq-question {
        padding: var(--spacing-small);
      }

      .page-666vn__faq-question-title {
        font-size: 1em;
      }

      .page-666vn__faq-answer {
        padding: 0 var(--spacing-small);
      }
      .page-666vn__faq-item.active .page-666vn__faq-answer {
        padding: var(--spacing-small) !important;
      }
    }