:root {
      --page-k9ccapp-primary-color: #e44d26; /* Cam đậm */
      --page-k9ccapp-secondary-color: #333;
      --page-k9ccapp-accent-color: #f0ad4e; /* Vàng cam */
      --page-k9ccapp-text-light: #fff;
      --page-k9ccapp-text-dark: #333;
      --page-k9ccapp-bg-light: #f9f9f9;
      --page-k9ccapp-bg-dark: #222;
      --page-k9ccapp-border-color: #ddd;
    }

    .page-k9ccapp {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-k9ccapp-text-dark);
      background-color: var(--page-k9ccapp-bg-light);
      padding-bottom: 80px; /* Để tránh nút nổi bị che khuất footer */
    }

    .page-k9ccapp__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-k9ccapp__hero-section {
      position: relative;
      background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('[GALLERY:hero:k9cc_app_banner,mobile_hero]') no-repeat center center/cover;
      color: var(--page-k9ccapp-text-light);
      text-align: center;
      padding: 10px 0 80px; /* Padding top for fixed header */
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 450px;
      overflow: hidden;
    }

    .page-k9ccapp__hero-content {
      position: relative;
      z-index: 1;
      max-width: 800px;
      padding: 20px;
    }

    .page-k9ccapp__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: var(--page-k9ccapp-text-light);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-k9ccapp__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      color: #f0f0f0;
    }

    .page-k9ccapp__cta-button {
      display: inline-block;
      background-color: var(--page-k9ccapp-primary-color);
      color: var(--page-k9ccapp-text-light);
      padding: 15px 30px;
      border-radius: 8px;
      font-size: 1.1em;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-k9ccapp__cta-button:hover {
      background-color: #c0392b;
      transform: translateY(-2px);
    }

    .page-k9ccapp__section {
      padding: 60px 0;
      text-align: center;
    }

    .page-k9ccapp__section:nth-of-type(even) {
      background-color: var(--page-k9ccapp-bg-light);
    }

    .page-k9ccapp__section-title {
      font-size: 2.2em;
      color: var(--page-k9ccapp-secondary-color);
      margin-bottom: 40px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-k9ccapp__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-k9ccapp-primary-color);
      border-radius: 2px;
    }

    .page-k9ccapp__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-k9ccapp__feature-item {
      background-color: #fff;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
      text-align: left;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
    }

    .page-k9ccapp__feature-item:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-k9ccapp__feature-icon {
      width: 80px;
      height: 80px;
      margin-bottom: 20px;
      display: block;
      object-fit: contain;
    }

    .page-k9ccapp__feature-title {
      font-size: 1.4em;
      color: var(--page-k9ccapp-primary-color);
      margin-bottom: 15px;
    }

    .page-k9ccapp__feature-description {
      font-size: 1em;
      color: var(--page-k9ccapp-secondary-color);
    }

    .page-k9ccapp__download-steps {
      display: flex;
      flex-direction: column;
      gap: 30px;
      margin-top: 40px;
    }

    .page-k9ccapp__step-item {
      display: flex;
      align-items: center;
      background-color: #fff;
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      text-align: left;
      box-sizing: border-box;
    }

    .page-k9ccapp__step-number {
      background-color: var(--page-k9ccapp-primary-color);
      color: var(--page-k9ccapp-text-light);
      width: 50px;
      height: 50px;
      min-width: 50px;
      min-height: 50px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.8em;
      font-weight: bold;
      margin-right: 25px;
    }

    .page-k9ccapp__step-content h3 {
      font-size: 1.3em;
      color: var(--page-k9ccapp-secondary-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-k9ccapp__step-content p {
      font-size: 1em;
      color: #666;
      margin-bottom: 0;
    }

    .page-k9ccapp__step-image {
      max-width: 250px;
      height: auto;
      border-radius: 8px;
      margin-left: 25px;
      flex-shrink: 0;
      object-fit: contain;
    }

    .page-k9ccapp__game-showcase {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      margin-top: 40px;
    }

    .page-k9ccapp__game-card {
      background-color: #fff;
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
    }

    .page-k9ccapp__game-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-k9ccapp__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-k9ccapp__game-info {
      padding: 20px;
      text-align: left;
    }

    .page-k9ccapp__game-title {
      font-size: 1.3em;
      color: var(--page-k9ccapp-primary-color);
      margin-bottom: 10px;
    }

    .page-k9ccapp__game-description {
      font-size: 0.95em;
      color: #555;
    }

    .page-k9ccapp__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-k9ccapp-accent-color);
      color: var(--page-k9ccapp-text-dark);
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      z-index: 1000;
      display: flex;
      align-items: center;
      gap: 10px;
      animation: page-k9ccapp__pulse 2s infinite;
      border: none;
      cursor: pointer;
    }

    .page-k9ccapp__floating-button:hover {
      background-color: #e0a030;
    }

    @keyframes page-k9ccapp__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    .page-k9ccapp__promo-section {
      background-color: var(--page-k9ccapp-primary-color);
      color: var(--page-k9ccapp-text-light);
      padding: 60px 0;
      text-align: center;
    }

    .page-k9ccapp__promo-title {
      font-size: 2.5em;
      margin-bottom: 20px;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
    }

    .page-k9ccapp__promo-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-k9ccapp__faq-section {
      text-align: left;
    }

    .page-k9ccapp__faq-list {
      margin-top: 40px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-k9ccapp__faq-item {
      background-color: #fff;
      margin-bottom: 15px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-k9ccapp__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #f0f0f0;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
      color: var(--page-k9ccapp-secondary-color);
    }

    .page-k9ccapp__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-k9ccapp__faq-question h3 {
      font-size: 1.15em;
      margin: 0;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-k9ccapp__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      margin-left: 15px;
      pointer-events: none; /* Prevent toggle icon from blocking click */
      transition: transform 0.3s ease;
    }

    .page-k9ccapp__faq-item.active .page-k9ccapp__faq-toggle {
      transform: rotate(45deg); /* Plus to X (Minus) */
    }

    .page-k9ccapp__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: #555;
    }

    .page-k9ccapp__faq-item.active .page-k9ccapp__faq-answer {
      max-height: 2000px !important; /* Use a large enough value for content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* Responsive adjustments */
    @media (max-width: 992px) {
      .page-k9ccapp__hero-title {
        font-size: 2.2em;
      }
      .page-k9ccapp__hero-subtitle {
        font-size: 1.1em;
      }
      .page-k9ccapp__section-title {
        font-size: 1.8em;
      }
      .page-k9ccapp__step-item {
        flex-direction: column;
        text-align: center;
      }
      .page-k9ccapp__step-number {
        margin-right: 0;
        margin-bottom: 20px;
      }
      .page-k9ccapp__step-image {
        margin-left: 0;
        margin-top: 20px;
      }
      .page-k9ccapp__promo-title {
        font-size: 2em;
      }
      .page-k9ccapp__promo-description {
        font-size: 1em;
      }
    }

    @media (max-width: 768px) {
      .page-k9ccapp__hero-section {
        padding-top: 10px; /* Adjust for smaller header on mobile */
        min-height: 350px;
      }
      .page-k9ccapp__hero-title {
        font-size: 1.8em;
      }
      .page-k9ccapp__hero-subtitle {
        font-size: 1em;
      }
      .page-k9ccapp__cta-button {
        padding: 12px 25px;
        font-size: 1em;
      }
      .page-k9ccapp__section {
        padding: 40px 0;
      }
      .page-k9ccapp__section-title {
        font-size: 1.6em;
        margin-bottom: 30px;
      }
      .page-k9ccapp__features-grid,
      .page-k9ccapp__game-showcase {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .page-k9ccapp__feature-item,
      .page-k9ccapp__game-card {
        padding: 20px;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-k9ccapp__step-item {
        padding: 20px;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }
      .page-k9ccapp__step-number {
        width: 45px;
        height: 45px;
        min-width: 45px;
        min-height: 45px;
        font-size: 1.5em;
      }
      .page-k9ccapp__step-image {
        max-width: 100% !important;
        height: auto !important;
        margin-top: 15px;
        box-sizing: border-box !important;
      }
      .page-k9ccapp__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.95em;
      }
      .page-k9ccapp__promo-section {
        padding: 40px 0;
      }
      .page-k9ccapp__promo-title {
        font-size: 1.8em;
      }
      .page-k9ccapp__promo-description {
        font-size: 0.9em;
      }
      .page-k9ccapp__faq-question {
        padding: 15px 20px;
      }
      .page-k9ccapp__faq-question h3 {
        font-size: 1em;
      }
      .page-k9ccapp__faq-answer {
        padding: 0 20px;
      }
      .page-k9ccapp__faq-item.active .page-k9ccapp__faq-answer {
        padding: 15px 20px !important;
      }
      .page-k9ccapp__container {
        padding: 0 10px;
      }
    }