:root {
      --page-df999vip-primary-color: #e44d26; /* Cam đỏ */
      --page-df999vip-secondary-color: #f7b731; /* Vàng cam */
      --page-df999vip-dark-color: #2c3e50; /* Xám đậm */
      --page-df999vip-light-color: #ecf0f1; /* Xám nhạt */
      --page-df999vip-text-color: #333;
      --page-df999vip-white-color: #ffffff;
      --page-df999vip-gray-light: #f8f9fa;
      --page-df999vip-gray-medium: #ced4da;
      --page-df999vip-success-color: #28a745;
      --page-df999vip-danger-color: #dc3545;
    }

    .page-df999vip {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-df999vip-text-color);
      background-color: var(--page-df999vip-gray-light);
      padding: 0;
      margin: 0;
      overflow-x: hidden;
    }

    .page-df999vip__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    @media (max-width: 768px) {
      .page-df999vip__container {
        padding: 10px;
      }
    }

    /* Hero Section */
    .page-df999vip__hero-section {
      position: relative;
      background-color: var(--page-df999vip-dark-color);
      color: var(--page-df999vip-white-color);
      text-align: center;
      padding-top: 10px; /* Adjusted for fixed header */
      padding-bottom: 50px;
      overflow: hidden;
    }

    .page-df999vip__hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.7));
      z-index: 1;
    }

    .page-df999vip__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .page-df999vip__hero-content {
      position: relative;
      z-index: 2;
      padding: 20px;
      max-width: 900px;
      margin: 0 auto;
    }

    .page-df999vip__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: var(--page-df999vip-secondary-color);
      text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
    }

    .page-df999vip__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      color: var(--page-df999vip-light-color);
    }

    .page-df999vip__button {
      display: inline-block;
      background-color: var(--page-df999vip-primary-color);
      color: var(--page-df999vip-white-color);
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-df999vip__button:hover {
      background-color: #c23d1d;
      transform: translateY(-2px);
    }

    @media (max-width: 768px) {
      .page-df999vip__hero-section {
        padding-top: 10px; /* Adjusted for fixed header on mobile */
      }
      .page-df999vip__hero-title {
        font-size: 2em;
      }
      .page-df999vip__hero-subtitle {
        font-size: 1em;
      }
      .page-df999vip__button {
        padding: 12px 25px;
        font-size: 1em;
      }
    }

    /* Section Styling */
    .page-df999vip__section {
      padding: 60px 0;
      background-color: var(--page-df999vip-white-color);
      margin-bottom: 20px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.05);
      border-radius: 8px;
    }

    .page-df999vip__section--alt {
      background-color: var(--page-df999vip-gray-light);
    }

    .page-df999vip__section-title {
      font-size: 2.2em;
      color: var(--page-df999vip-dark-color);
      text-align: center;
      margin-bottom: 40px;
      position: relative;
      padding-bottom: 15px;
    }

    .page-df999vip__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-df999vip-primary-color);
      border-radius: 2px;
    }

    .page-df999vip__text-content {
      font-size: 1.1em;
      text-align: justify;
      margin-bottom: 20px;
    }

    @media (max-width: 768px) {
      .page-df999vip__section {
        padding: 30px 0;
      }
      .page-df999vip__section-title {
        font-size: 1.8em;
        margin-bottom: 25px;
      }
      .page-df999vip__text-content {
        font-size: 1em;
      }
    }

    /* Feature/Card Grid */
    .page-df999vip__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-df999vip__card {
      background-color: var(--page-df999vip-white-color);
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
      padding: 30px;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      height: 100%;
      box-sizing: border-box;
    }

    .page-df999vip__card:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    }

    .page-df999vip__card-icon {
      width: 100px;
      height: 100px;
      margin-bottom: 20px;
      object-fit: contain;
      border-radius: 8px;
    }

    .page-df999vip__card-title {
      font-size: 1.5em;
      color: var(--page-df999vip-primary-color);
      margin-bottom: 15px;
    }

    .page-df999vip__card-description {
      font-size: 0.95em;
      color: var(--page-df999vip-text-color);
      flex-grow: 1;
      word-wrap: break-word;
      overflow-wrap: break-word;
      text-align: left;
    }

    @media (max-width: 768px) {
      .page-df999vip__grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .page-df999vip__card {
        padding: 20px;
      }
      .page-df999vip__card-icon {
        width: 80px;
        height: 80px;
        margin-bottom: 15px;
      }
      .page-df999vip__card-title {
        font-size: 1.3em;
      }
      .page-df999vip__card-description {
        font-size: 0.9em;
      }
    }

    /* Game List */
    .page-df999vip__game-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-df999vip__game-item {
      background-color: var(--page-df999vip-white-color);
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.08);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box;
    }

    .page-df999vip__game-item:hover {
      transform: translateY(-3px);
    }

    .page-df999vip__game-image {
      width: 100%;
      height: 150px;
      object-fit: cover;
      display: block;
    }

    .page-df999vip__game-title {
      font-size: 1.1em;
      color: var(--page-df999vip-dark-color);
      padding: 15px 10px;
      margin: 0;
      background-color: var(--page-df999vip-light-color);
    }

    @media (max-width: 768px) {
      .page-df999vip__game-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
      }
      .page-df999vip__game-image {
        height: 120px;
      }
      .page-df999vip__game-title {
        font-size: 1em;
        padding: 10px 5px;
      }
    }

    /* Floating Login Button */
    .page-df999vip__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-df999vip-success-color); /* Màu xanh lá nổi bật */
      color: var(--page-df999vip-white-color);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 10px rgba(0,0,0,0.2);
      z-index: 1000;
      animation: page-df999vip__pulse 2s infinite;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      line-height: 1.2;
    }

    .page-df999vip__floating-button:hover {
      background-color: #218838;
      animation: none;
    }

    @keyframes page-df999vip__pulse {
      0% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.05);
      }
      100% {
        transform: scale(1);
      }
    }

    @media (min-width: 769px) {
      .page-df999vip__floating-button {
        display: none; /* Hide on desktop */
      }
    }

    @media (max-width: 768px) {
      .page-df999vip__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.95em;
        width: auto;
        max-width: 180px;
      }
    }

    /* FAQ Section */
    .page-df999vip__faq-section {
      background-color: var(--page-df999vip-white-color);
      padding: 60px 0;
      margin-bottom: 20px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.05);
      border-radius: 8px;
    }

    .page-df999vip__faq-list {
      margin-top: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-df999vip__faq-item {
      background-color: var(--page-df999vip-gray-light);
      border: 1px solid var(--page-df999vip-gray-medium);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-df999vip__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: var(--page-df999vip-white-color);
      color: var(--page-df999vip-dark-color);
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-df999vip__faq-question:hover {
      background-color: var(--page-df999vip-light-color);
    }

    .page-df999vip__faq-question h3 {
      margin: 0;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click */
      font-size: 1.1em;
      color: var(--page-df999vip-dark-color);
    }

    .page-df999vip__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      margin-left: 15px;
      color: var(--page-df999vip-primary-color);
      pointer-events: none; /* Prevent toggle from blocking click */
      transition: transform 0.3s ease;
    }

    .page-df999vip__faq-item.active .page-df999vip__faq-toggle {
      transform: rotate(45deg);
    }

    .page-df999vip__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.3s ease;
      opacity: 0;
      color: var(--page-df999vip-text-color);
      background-color: var(--page-df999vip-gray-light);
    }

    .page-df999vip__faq-item.active .page-df999vip__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px !important;
      opacity: 1;
    }

    .page-df999vip__faq-answer p {
      margin: 0;
    }

    @media (max-width: 768px) {
      .page-df999vip__faq-question {
        padding: 12px 15px;
        font-size: 1em;
      }
      .page-df999vip__faq-question h3 {
        font-size: 1em;
      }
      .page-df999vip__faq-answer {
        padding: 0 15px;
      }
      .page-df999vip__faq-item.active .page-df999vip__faq-answer {
        padding: 15px !important;
      }
    }

    /* Call to Action */
    .page-df999vip__cta-section {
      text-align: center;
      padding: 40px 20px;
      background-color: var(--page-df999vip-primary-color);
      color: var(--page-df999vip-white-color);
      border-radius: 8px;
      margin-top: 20px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .page-df999vip__cta-title {
      font-size: 2em;
      margin-bottom: 20px;
    }

    .page-df999vip__cta-text {
      font-size: 1.1em;
      margin-bottom: 30px;
    }

    .page-df999vip__cta-button {
      background-color: var(--page-df999vip-secondary-color);
      color: var(--page-df999vip-dark-color);
      padding: 15px 35px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-df999vip__cta-button:hover {
      background-color: #f5a623;
      transform: translateY(-2px);
    }

    @media (max-width: 768px) {
      .page-df999vip__cta-section {
        padding: 30px 15px;
      }
      .page-df999vip__cta-title {
        font-size: 1.6em;
      }
      .page-df999vip__cta-text {
        font-size: 1em;
      }
      .page-df999vip__cta-button {
        padding: 12px 25px;
        font-size: 1em;
      }
    }

    /* General Image Responsive */
    .page-df999vip img {
      max-width: 100% !important;
      height: auto !important;
      display: block; /* Remove extra space below images */
      box-sizing: border-box !important;
    }
    .page-df999vip__image-container {
      width: 100% !important;
      max-width: 100% !important;
      overflow: hidden !important;
      box-sizing: border-box !important;
    }

    /* List Item Responsive */
    .page-df999vip__list-item {
      box-sizing: border-box;
    }

    @media (max-width: 768px) {
      .page-df999vip__list-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding-left: 10px !important;
        padding-right: 10px !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-df999vip ul, .page-df999vip ol {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
    }