:root {
      --page-999-ok-primary-color: #e0b020; /* Vàng kim */
      --page-999-ok-secondary-color: #1a1a1a; /* Gần đen */
      --page-999-ok-accent-color: #33cc33; /* Xanh lá */
      --page-999-ok-text-light: #f0f0f0;
      --page-999-ok-text-dark: #333;
      --page-999-ok-bg-dark: #0d0d0d;
      --page-999-ok-bg-medium: #1f1f1f;
      --page-999-ok-border-color: #333;
      --page-999-ok-border-radius: 8px;
      --page-999-ok-spacing-unit: 16px;
    }

    .page-999-ok {
      font-family: 'Arial', sans-serif;
      color: var(--page-999-ok-text-light);
      background-color: var(--page-999-ok-bg-dark);
      line-height: 1.6;
      padding-top: 10px; /* Small top padding, assuming shared.css handles header offset */
    }

    .page-999-ok__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: var(--page-999-ok-spacing-unit);
      box-sizing: border-box;
    }

    .page-999-ok__hero-section {
      position: relative;
      background-color: var(--page-999-ok-bg-medium);
      text-align: center;
      padding: calc(2 * var(--page-999-ok-spacing-unit)) var(--page-999-ok-spacing-unit);
      margin-bottom: calc(2 * var(--page-999-ok-spacing-unit));
      border-radius: var(--page-999-ok-border-radius);
      overflow: hidden;
    }

    .page-999-ok__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.3;
      z-index: 0;
    }

    .page-999-ok__hero-content {
      position: relative;
      z-index: 1;
    }

    .page-999-ok__hero-title {
      font-size: 2.8em;
      color: var(--page-999-ok-primary-color);
      margin-bottom: var(--page-999-ok-spacing-unit);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .page-999-ok__hero-subtitle {
      font-size: 1.2em;
      color: var(--page-999-ok-text-light);
      margin-bottom: calc(2 * var(--page-999-ok-spacing-unit));
    }

    .page-999-ok__floating-buttons {
      position: fixed;
      bottom: var(--page-999-ok-spacing-unit);
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: var(--page-999-ok-spacing-unit);
      z-index: 1000;
      width: calc(100% - 2 * var(--page-999-ok-spacing-unit));
      max-width: 380px;
      box-sizing: border-box;
    }

    .page-999-ok__button {
      flex: 1;
      padding: 12px 20px;
      background-color: var(--page-999-ok-primary-color);
      color: var(--page-999-ok-secondary-color);
      text-decoration: none;
      border-radius: var(--page-999-ok-border-radius);
      font-weight: bold;
      text-align: center;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
      box-sizing: border-box;
    }

    .page-999-ok__button:hover {
      background-color: #ffc107;
      transform: translateY(-2px);
    }

    .page-999-ok__button--register {
      background-color: var(--page-999-ok-accent-color);
      color: var(--page-999-ok-bg-dark);
    }

    .page-999-ok__button--register:hover {
      background-color: #28a745;
    }

    .page-999-ok__section {
      background-color: var(--page-999-ok-bg-medium);
      padding: calc(2 * var(--page-999-ok-spacing-unit)) var(--page-999-ok-spacing-unit));
      margin-bottom: calc(2 * var(--page-999-ok-spacing-unit));
      border-radius: var(--page-999-ok-border-radius);
      box-sizing: border-box;
    }

    .page-999-ok__section-title {
      font-size: 2em;
      color: var(--page-999-ok-primary-color);
      text-align: center;
      margin-bottom: calc(2 * var(--page-999-ok-spacing-unit));
      text-transform: uppercase;
    }

    .page-999-ok__product-grid,
    .page-999-ok__provider-grid,
    .page-999-ok__payment-grid,
    .page-999-ok__social-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: var(--page-999-ok-spacing-unit);
      justify-content: center;
      align-items: stretch;
    }

    .page-999-ok__product-card,
    .page-999-ok__provider-item,
    .page-999-ok__payment-item,
    .page-999-ok__social-item,
    .page-999-ok__promo-card,
    .page-999-ok__feature-item {
      background-color: var(--page-999-ok-bg-dark);
      border: 1px solid var(--page-999-ok-border-color);
      border-radius: var(--page-999-ok-border-radius);
      text-align: center;
      padding: var(--page-999-ok-spacing-unit);
      display: flex;
      flex-direction: column;
      align-items: center;
      box-sizing: border-box;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .page-999-ok__product-card:hover,
    .page-999-ok__provider-item:hover,
    .page-999-ok__payment-item:hover,
    .page-999-ok__social-item:hover,
    .page-999-ok__promo-card:hover,
    .page-999-ok__feature-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    }

    .page-999-ok__product-image,
    .page-999-ok__provider-logo,
    .page-999-ok__payment-logo,
    .page-999-ok__social-icon {
      max-width: 100%;
      height: auto;
      border-radius: var(--page-999-ok-border-radius);
      margin-bottom: var(--page-999-ok-spacing-unit);
      object-fit: contain;
    }

    .page-999-ok__product-image-container,
    .page-999-ok__provider-logo-container,
    .page-999-ok__payment-logo-container,
    .page-999-ok__social-icon-container {
      width: 100%;
      max-width: 100%;
      height: 150px; /* Fixed height for consistent display */
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: var(--page-999-ok-spacing-unit);
      box-sizing: border-box;
    }

    .page-999-ok__product-image,
    .page-999-ok__provider-logo,
    .page-999-ok__payment-logo {
      max-height: 100%;
      width: auto;
      max-width: 100%;
    }

    .page-999-ok__social-icon {
      width: 80px;
      height: 80px;
      border-radius: 50%;
    }

    .page-999-ok__product-name,
    .page-999-ok__provider-name,
    .page-999-ok__payment-name,
    .page-999-ok__social-name {
      font-size: 1.1em;
      color: var(--page-999-ok-text-light);
      font-weight: bold;
    }

    .page-999-ok__promo-card {
      align-items: flex-start;
      text-align: left;
    }

    .page-999-ok__promo-card h3 {
      color: var(--page-999-ok-primary-color);
      margin-top: 0;
      margin-bottom: 8px;
      font-size: 1.3em;
    }

    .page-999-ok__promo-card p {
      font-size: 0.95em;
      color: var(--page-999-ok-text-light);
      margin-bottom: var(--page-999-ok-spacing-unit);
    }

    .page-999-ok__promo-card .page-999-ok__button {
      padding: 8px 15px;
      font-size: 0.9em;
      background-color: var(--page-999-ok-accent-color);
      color: var(--page-999-ok-bg-dark);
      align-self: flex-start;
    }

    .page-999-ok__promo-card .page-999-ok__button:hover {
      background-color: #28a745;
    }

    .page-999-ok__features-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--page-999-ok-spacing-unit);
    }

    .page-999-ok__feature-item {
      text-align: left;
      padding: calc(1.5 * var(--page-999-ok-spacing-unit));
      border-left: 4px solid var(--page-999-ok-primary-color);
      flex-direction: row;
      gap: var(--page-999-ok-spacing-unit);
      align-items: flex-start;
    }

    .page-999-ok__feature-icon-container {
      flex-shrink: 0;
      width: 60px;
      height: 60px;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: var(--page-999-ok-primary-color);
      border-radius: 50%;
      color: var(--page-999-ok-bg-dark);
      font-size: 1.8em;
      font-weight: bold;
    }

    .page-999-ok__feature-content h3 {
      color: var(--page-999-ok-text-light);
      margin-top: 0;
      margin-bottom: 5px;
      font-size: 1.2em;
    }

    .page-999-ok__feature-content p {
      font-size: 0.9em;
      color: #ccc;
    }

    .page-999-ok__faq-section {
      padding-bottom: calc(2 * var(--page-999-ok-spacing-unit) + 60px); /* Adjust for floating buttons */
    }

    .page-999-ok__faq-item {
      background-color: var(--page-999-ok-bg-dark);
      border: 1px solid var(--page-999-ok-border-color);
      border-radius: var(--page-999-ok-border-radius);
      margin-bottom: var(--page-999-ok-spacing-unit);
      overflow: hidden;
    }

    .page-999-ok__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: var(--page-999-ok-spacing-unit) calc(1.5 * var(--page-999-ok-spacing-unit));
      cursor: pointer;
      user-select: none;
      background-color: var(--page-999-ok-bg-medium);
      transition: background-color 0.3s ease;
    }

    .page-999-ok__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-999-ok-text-light);
      pointer-events: none;
    }

    .page-999-ok__faq-question:hover {
      background-color: #2a2a2a;
    }

    .page-999-ok__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-999-ok-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none;
    }

    .page-999-ok__faq-item.active .page-999-ok__faq-toggle {
      transform: rotate(45deg);
      color: var(--page-999-ok-accent-color);
    }

    .page-999-ok__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 calc(1.5 * var(--page-999-ok-spacing-unit));
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.3s ease;
      color: #bbb;
      font-size: 0.95em;
    }

    .page-999-ok__faq-item.active .page-999-ok__faq-answer {
      max-height: 2000px !important;
      padding: var(--page-999-ok-spacing-unit) calc(1.5 * var(--page-999-ok-spacing-unit)) !important;
      opacity: 1;
    }

    .page-999-ok__faq-answer p {
      margin-top: 0;
      margin-bottom: var(--page-999-ok-spacing-unit);
    }

    /* Responsive styles */
    @media (max-width: 768px) {
      .page-999-ok__hero-title {
        font-size: 2em;
      }

      .page-999-ok__hero-subtitle {
        font-size: 1em;
      }

      .page-999-ok__section-title {
        font-size: 1.8em;
      }

      .page-999-ok__product-grid,
      .page-999-ok__provider-grid,
      .page-999-ok__payment-grid,
      .page-999-ok__social-list,
      .page-999-ok__features-list {
        grid-template-columns: 1fr !important;
        gap: calc(0.75 * var(--page-999-ok-spacing-unit)) !important;
      }

      .page-999-ok__product-card,
      .page-999-ok__provider-item,
      .page-999-ok__payment-item,
      .page-999-ok__social-item,
      .page-999-ok__promo-card,
      .page-999-ok__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: var(--page-999-ok-spacing-unit) !important;
        box-sizing: border-box !important;
      }

      .page-999-ok__product-image-container,
      .page-999-ok__provider-logo-container,
      .page-999-ok__payment-logo-container,
      .page-999-ok__social-icon-container {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }

      .page-999-ok__product-image,
      .page-999-ok__provider-logo,
      .page-999-ok__payment-logo,
      .page-999-ok__social-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-999-ok__floating-buttons {
        gap: 8px;
        padding: 0 8px;
      }

      .page-999-ok__button {
        padding: 10px 15px;
        font-size: 0.9em;
      }

      .page-999-ok__faq-question,
      .page-999-ok__faq-answer {
        padding-left: var(--page-999-ok-spacing-unit) !important;
        padding-right: var(--page-999-ok-spacing-unit) !important;
      }

      .page-999-ok__faq-item.active .page-999-ok__faq-answer {
        padding: var(--page-999-ok-spacing-unit) !important;
      }

      .page-999-ok__feature-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
      }
      .page-999-ok__feature-icon-container {
        margin-bottom: 10px;
      }
    }

    @media (max-width: 480px) {
      .page-999-ok__hero-title {
        font-size: 1.8em;
      }

      .page-999-ok__section-title {
        font-size: 1.5em;
      }
    }