:root {
      --page-kufun-primary-color: #f7b731; /* Vàng cam */
      --page-kufun-secondary-color: #2c3e50; /* Xám xanh đậm */
      --page-kufun-accent-color: #e74c3c; /* Đỏ cam */
      --page-kufun-text-color: #ecf0f1; /* Trắng nhạt */
      --page-kufun-dark-text-color: #34495e; /* Xám đậm */
      --page-kufun-bg-color: #1a2a3a; /* Nền xanh đậm */
      --page-kufun-light-bg-color: #223344; /* Nền xanh nhạt hơn */
      --page-kufun-card-bg: #2d4059; /* Nền thẻ */
      --page-kufun-border-color: #3a506b; /* Màu viền */
      --page-kufun-button-hover: #e09f3e;
    }

    /* Base styles for the page-kufun scope */
    .page-kufun {
      font-family: 'Arial', sans-serif;
      color: var(--page-kufun-text-color);
      background-color: var(--page-kufun-bg-color);
      line-height: 1.6;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }

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

    /* Hero Section */
    .page-kufun__hero-section {
      background: linear-gradient(135deg, var(--page-kufun-secondary-color) 0%, var(--page-kufun-bg-color) 100%);
      text-align: center;
      padding: 10px 20px 60px; /* Adjusted padding-top for fixed header */
      position: relative;
      overflow: hidden;
      box-sizing: border-box;
    }
    @media (max-width: 768px) {
      .page-kufun__hero-section {
        padding-top: 10px !important; /* Mobile specific padding-top */
      }
    }

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

    .page-kufun__hero-title {
      font-size: 3em;
      color: var(--page-kufun-primary-color);
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }
    .page-kufun__hero-subtitle {
      font-size: 1.5em;
      color: var(--page-kufun-text-color);
      margin-bottom: 30px;
      opacity: 0.9;
    }
    .page-kufun__hero-image {
      width: 100%;
      max-width: 800px;
      height: auto;
      margin-top: 30px;
      border-radius: 15px;
      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
      display: block;
      margin-left: auto;
      margin-right: auto;
    }

    /* General Section Styling */
    .page-kufun__section {
      padding: 60px 20px;
      text-align: center;
      background-color: var(--page-kufun-light-bg-color);
      margin-bottom: 20px;
      border-radius: 10px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }
    .page-kufun__section--dark {
      background-color: var(--page-kufun-secondary-color);
    }
    .page-kufun__section-title {
      font-size: 2.5em;
      color: var(--page-kufun-primary-color);
      margin-bottom: 40px;
      text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
    }
    .page-kufun__section-description {
      font-size: 1.1em;
      max-width: 800px;
      margin: 0 auto 40px;
      color: var(--page-kufun-text-color);
      opacity: 0.9;
    }

    /* Buttons */
    .page-kufun__button {
      display: inline-block;
      background-color: var(--page-kufun-primary-color);
      color: var(--page-kufun-secondary-color);
      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-kufun__button:hover {
      background-color: var(--page-kufun-button-hover);
      transform: translateY(-2px);
    }
    .page-kufun__button--secondary {
      background-color: var(--page-kufun-accent-color);
      color: var(--page-kufun-text-color);
    }
    .page-kufun__button--secondary:hover {
      background-color: #c0392b;
    }

    /* Game Cards */
    .page-kufun__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }
    .page-kufun__game-card {
      background-color: var(--page-kufun-card-bg);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
      text-align: left;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .page-kufun__game-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
    }
    .page-kufun__game-card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--page-kufun-border-color);
    }
    .page-kufun__game-card-content {
      padding: 25px;
    }
    .page-kufun__game-card-title {
      font-size: 1.6em;
      color: var(--page-kufun-primary-color);
      margin-bottom: 10px;
    }
    .page-kufun__game-card-description {
      font-size: 0.95em;
      color: var(--page-kufun-text-color);
      opacity: 0.8;
      margin-bottom: 20px;
    }
    .page-kufun__game-card-button {
      display: block;
      width: fit-content;
      margin: 0 auto;
      padding: 10px 20px;
      background-color: var(--page-kufun-accent-color);
      color: var(--page-kufun-text-color);
      border-radius: 6px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }
    .page-kufun__game-card-button:hover {
      background-color: #c0392b;
    }

    /* Download Section */
    .page-kufun__download-flex {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 50px;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .page-kufun__download-content {
      text-align: left;
      max-width: 500px;
    }
    .page-kufun__download-content h3 {
      font-size: 2em;
      color: var(--page-kufun-primary-color);
      margin-bottom: 20px;
    }
    .page-kufun__download-content p {
      margin-bottom: 25px;
      font-size: 1.1em;
      color: var(--page-kufun-text-color);
      opacity: 0.9;
    }
    .page-kufun__download-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .page-kufun__download-qr-code {
      width: 100%;
      max-width: 250px;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    /* Why Choose Section */
    .page-kufun__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }
    .page-kufun__feature-item {
      background-color: var(--page-kufun-card-bg);
      padding: 30px;
      border-radius: 12px;
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
      text-align: center;
    }
    .page-kufun__feature-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 20px;
      display: inline-block;
      object-fit: contain;
    }
    .page-kufun__feature-title {
      font-size: 1.8em;
      color: var(--page-kufun-primary-color);
      margin-bottom: 15px;
    }
    .page-kufun__feature-description {
      font-size: 1em;
      color: var(--page-kufun-text-color);
      opacity: 0.8;
    }

    /* FAQ Section */
    .page-kufun__faq-list {
      max-width: 900px;
      margin: 40px auto 0;
      text-align: left;
    }
    .page-kufun__faq-item {
      background-color: var(--page-kufun-card-bg);
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      overflow: hidden;
      border: 1px solid var(--page-kufun-border-color);
    }
    .page-kufun__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: var(--page-kufun-secondary-color);
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }
    .page-kufun__faq-question:hover {
      background-color: #3a506b;
    }
    .page-kufun__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-kufun-primary-color);
      pointer-events: none; /* Prevents h3 from capturing click */
    }
    .page-kufun__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-kufun-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevents toggle icon from capturing click */
    }
    .page-kufun__faq-item.active .page-kufun__faq-toggle {
      transform: rotate(45deg); /* Change + to X (or rotate to -) */
    }
    .page-kufun__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px; /* Adjust padding for closed state */
      color: var(--page-kufun-text-color);
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
    }
    .page-kufun__faq-item.active .page-kufun__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 25px !important; /* Padding for open state */
      opacity: 1;
    }
    .page-kufun__faq-answer p {
      margin-bottom: 10px;
    }

    /* Floating Login Button */
    .page-kufun__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-kufun-accent-color);
      color: var(--page-kufun-text-color);
      padding: 15px 25px;
      border-radius: 50px;
      font-weight: bold;
      font-size: 1.1em;
      text-align: center;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      transition: background-color 0.3s ease, transform 0.2s ease;
      text-decoration: none; /* Ensure it looks like a button */
    }
    .page-kufun__floating-button:hover {
      background-color: #c0392b;
      transform: translateY(-3px);
    }
    @media (max-width: 768px) {
      .page-kufun__floating-button {
        left: 50%;
        transform: translateX(-50%);
        right: auto;
        width: 80%;
        max-width: 300px;
        font-size: 1em;
        padding: 12px 20px;
      }
    }

    /* Responsive adjustments */
    @media (max-width: 992px) {
      .page-kufun__hero-title {
        font-size: 2.5em;
      }
      .page-kufun__hero-subtitle {
        font-size: 1.3em;
      }
      .page-kufun__section-title {
        font-size: 2em;
      }
      .page-kufun__download-flex {
        flex-direction: column;
        gap: 30px;
      }
      .page-kufun__download-content {
        text-align: center;
      }
      .page-kufun__download-buttons {
        justify-content: center;
      }
    }

    @media (max-width: 768px) {
      .page-kufun__container {
        padding: 15px;
      }
      .page-kufun__hero-title {
        font-size: 2em;
      }
      .page-kufun__hero-subtitle {
        font-size: 1.1em;
      }
      .page-kufun__section {
        padding: 40px 15px;
      }
      .page-kufun__section-title {
        font-size: 1.8em;
      }
      .page-kufun__game-grid,
      .page-kufun__features-grid {
        grid-template-columns: 1fr;
      }
      .page-kufun__game-card-image {
        height: 180px;
      }
      .page-kufun__faq-question {
        padding: 15px 20px;
      }
      .page-kufun__faq-question h3 {
        font-size: 1.1em;
      }
      .page-kufun__faq-answer {
        padding: 0 20px;
      }
      .page-kufun__faq-item.active .page-kufun__faq-answer {
        padding: 15px 20px !important;
      }
      /* Ensure images are responsive */
      .page-kufun img {
        max-width: 100% !important;
        height: auto !important;
        display: block !important;
        margin-left: auto !important;
        margin-right: auto !important;
      }
      /* Specific override for image containers to ensure responsiveness */
      .page-kufun__hero-image,
      .page-kufun__game-card-image,
      .page-kufun__download-qr-code,
      .page-kufun__feature-icon {
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }