:root {
      --page-sumvipclub-primary-color: #e44d26; /* Cam đỏ */
      --page-sumvipclub-secondary-color: #f7b731; /* Vàng cam */
      --page-sumvipclub-accent-color: #4CAF50; /* Xanh lá */
      --page-sumvipclub-text-dark: #333333;
      --page-sumvipclub-text-light: #ffffff;
      --page-sumvipclub-bg-light: #f4f4f4;
      --page-sumvipclub-bg-dark: #2c3e50; /* Xám xanh đậm */
      --page-sumvipclub-border-color: #ddd;
    }

    .page-sumvipclub {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-sumvipclub-text-dark);
      background-color: var(--page-sumvipclub-bg-light);
      padding: 0;
      margin: 0;
    }

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

    .page-sumvipclub__hero-section {
      position: relative;
      background-color: var(--page-sumvipclub-bg-dark);
      color: var(--page-sumvipclub-text-light);
      text-align: center;
      padding: 10px 0 60px 0; /* Adjusted padding-top for fixed header */
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-sumvipclub__hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.3;
      z-index: 0;
      max-width: 100%; /* Ensure image responsiveness */
    }

    .page-sumvipclub__hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
      margin: 0 auto;
      padding: 40px 20px;
    }

    .page-sumvipclub__main-heading {
      font-size: 2.8em;
      margin-bottom: 20px;
      color: var(--page-sumvipclub-secondary-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-sumvipclub__hero-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      color: var(--page-sumvipclub-text-light);
    }

    .page-sumvipclub__button {
      display: inline-block;
      background-color: var(--page-sumvipclub-primary-color);
      color: var(--page-sumvipclub-text-light);
      padding: 15px 30px;
      border-radius: 8px;
      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-sumvipclub__button:hover {
      background-color: #c74120;
      transform: translateY(-2px);
    }

    .page-sumvipclub__floating-promo {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-sumvipclub-accent-color);
      color: var(--page-sumvipclub-text-light);
      padding: 12px 20px;
      border-radius: 50px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      text-align: center;
      z-index: 1000;
      font-weight: bold;
      font-size: 1.1em;
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.2s ease;
      animation: page-sumvipclub__pulse 2s infinite;
      border: none;
    }

    .page-sumvipclub__floating-promo:hover {
      background-color: #3e8e41;
      transform: scale(1.05);
    }

    @keyframes page-sumvipclub__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }

    .page-sumvipclub__section {
      padding: 60px 0;
      background-color: var(--page-sumvipclub-bg-light);
    }

    .page-sumvipclub__section--alt {
      background-color: #e0e0e0;
    }

    .page-sumvipclub__section-heading {
      text-align: center;
      font-size: 2.2em;
      margin-bottom: 40px;
      color: var(--page-sumvipclub-primary-color);
    }

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

    .page-sumvipclub__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-sumvipclub__card {
      background-color: var(--page-sumvipclub-text-light);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .page-sumvipclub__card:hover {
      transform: translateY(-5px);
    }

    .page-sumvipclub__card-image {
      width: 100%;
      height: 250px;
      object-fit: cover;
      max-width: 100%; /* Ensure image responsiveness */
    }

    .page-sumvipclub__card-content {
      padding: 25px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .page-sumvipclub__card-description {
      font-size: 1em;
      color: var(--page-sumvipclub-text-dark);
      margin-bottom: 20px;
    }

    .page-sumvipclub__game-list {
      list-style: none;
      padding: 0;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-sumvipclub__game-item {
      background-color: var(--page-sumvipclub-text-light);
      border-left: 5px solid var(--page-sumvipclub-secondary-color);
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: center;
      box-sizing: border-box; /* Crucial for responsive lists */
    }

    .page-sumvipclub__game-icon {
      width: 60px;
      height: 60px;
      margin-right: 15px;
      object-fit: contain;
      max-width: 100%; /* Ensure image responsiveness */
    }

    .page-sumvipclub__game-name {
      font-size: 1.2em;
      font-weight: bold;
      color: var(--page-sumvipclub-primary-color);
    }

    .page-sumvipclub__faq-section {
      padding: 60px 0;
      background-color: var(--page-sumvipclub-bg-light);
    }

    .page-sumvipclub__faq-list {
      max-width: 900px;
      margin: 0 auto;
      padding: 0;
      list-style: none;
    }

    .page-sumvipclub__faq-item {
      background-color: var(--page-sumvipclub-text-light);
      margin-bottom: 15px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-sumvipclub__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #f0f0f0;
      border-bottom: 1px solid var(--page-sumvipclub-border-color);
      color: var(--page-sumvipclub-text-dark);
      font-size: 1.1em;
      font-weight: bold;
      user-select: none;
      transition: background-color 0.3s ease;
    }

    .page-sumvipclub__faq-question:hover {
      background-color: #e8e8e8;
    }

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

    .page-sumvipclub__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-sumvipclub-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from intercepting click */
    }

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

    .page-sumvipclub__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px; /* Initial padding */
      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(--page-sumvipclub-text-dark);
    }

    .page-sumvipclub__faq-item.active .page-sumvipclub__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to accommodate content */
      padding: 20px 25px !important; /* Expanded padding */
      opacity: 1;
    }

    .page-sumvipclub__download-link {
      display: block;
      background-color: var(--page-sumvipclub-primary-color);
      color: var(--page-sumvipclub-text-light);
      padding: 15px 20px;
      border-radius: 8px;
      text-align: center;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      margin-top: 20px;
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-sumvipclub__download-link:hover {
      background-color: #c74120;
      transform: translateY(-2px);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-sumvipclub__hero-section {
        padding: 10px 0 40px 0; /* Adjust padding-top for mobile fixed header */
      }

      .page-sumvipclub__main-heading {
        font-size: 2em;
      }

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

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

      .page-sumvipclub__section-heading {
        font-size: 1.8em;
        margin-bottom: 30px;
      }

      .page-sumvipclub__container {
        padding: 15px;
      }

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

      .page-sumvipclub__game-list {
        grid-template-columns: 1fr;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-sumvipclub__game-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 15px !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-sumvipclub__game-name {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-sumvipclub__card-image {
        max-width: 100% !important;
        height: 200px;
      }
      
      .page-sumvipclub__faq-question {
        padding: 15px 20px;
        font-size: 1em;
      }
      .page-sumvipclub__faq-question h3 {
        font-size: 1em;
      }

      .page-sumvipclub__faq-answer {
        padding: 0 20px;
      }
      .page-sumvipclub__faq-item.active .page-sumvipclub__faq-answer {
        padding: 15px 20px !important;
      }
      .page-sumvipclub__floating-promo {
        bottom: 15px;
        right: 15px;
        padding: 10px 15px;
        font-size: 0.9em;
      }
    }
    @media (max-width: 480px) {
      .page-sumvipclub__main-heading {
        font-size: 1.8em;
      }
      .page-sumvipclub__hero-description {
        font-size: 0.9em;
      }
      .page-sumvipclub__button {
        padding: 10px 20px;
        font-size: 0.9em;
      }
      .page-sumvipclub__section-heading {
        font-size: 1.6em;
      }
    }