:root {
      --page-u888-primary-color: #e44d26; /* Cam đỏ */
      --page-u888-secondary-color: #f7a01a; /* Cam sáng */
      --page-u888-accent-color: #4CAF50; /* Xanh lá */
      --page-u888-text-color: #333;
      --page-u888-light-text-color: #fefefe;
      --page-u888-background-color: #f4f7f6;
      --page-u888-card-background: #ffffff;
      --page-u888-border-radius: 8px;
      --page-u888-box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .page-u888 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-u888-text-color);
      background-color: var(--page-u888-background-color);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    .page-u888__section {
      padding: 40px 20px;
      margin: 0 auto;
      max-width: 1200px;
      box-sizing: border-box;
    }

    .page-u888__section--dark {
      background-color: #2c3e50;
      color: var(--page-u888-light-text-color);
    }

    .page-u888__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-u888__hero-section {
      position: relative;
      width: 100%;
      min-height: 500px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: var(--page-u888-light-text-color);
      overflow: hidden;
      padding-top: 80px; /* Adjust for fixed header */
      box-sizing: border-box;
    }

    .page-u888__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: -1;
      filter: brightness(0.7); /* Slightly darken background for text readability */
    }

    .page-u888__hero-content {
      position: relative;
      z-index: 1;
      max-width: 800px;
      padding: 20px;
      background: rgba(0, 0, 0, 0.4);
      border-radius: var(--page-u888-border-radius);
    }

    .page-u888__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: bold;
      line-height: 1.2;
    }

    .page-u888__hero-subtitle {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-u888__button {
      display: inline-block;
      background-color: var(--page-u888-primary-color);
      color: var(--page-u888-light-text-color);
      padding: 12px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-u888__button:hover {
      background-color: #c23b1c;
      transform: translateY(-2px);
    }

    .page-u888__floating-button {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      background-color: var(--page-u888-accent-color);
      color: var(--page-u888-light-text-color);
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: var(--page-u888-box-shadow);
      animation: page-u888__pulse 2s infinite;
      white-space: nowrap; /* Prevent text wrapping */
    }

    .page-u888__floating-button:hover {
      background-color: #3b8e3f;
      animation: none;
    }

    @keyframes page-u888__pulse {
      0% { transform: translateX(-50%) scale(1); }
      50% { transform: translateX(-50%) scale(1.05); }
      100% { transform: translateX(-50%) scale(1); }
    }

    .page-u888__title {
      font-size: 2.2em;
      color: var(--page-u888-primary-color);
      text-align: center;
      margin-bottom: 40px;
      font-weight: bold;
    }

    .page-u888__subtitle {
      font-size: 1.5em;
      color: var(--page-u888-text-color);
      text-align: center;
      margin-bottom: 30px;
    }

    .page-u888__text-block {
      background-color: var(--page-u888-card-background);
      padding: 30px;
      border-radius: var(--page-u888-border-radius);
      box-shadow: var(--page-u888-box-shadow);
      margin-bottom: 30px;
    }

    .page-u888__text-block p {
      margin-bottom: 15px;
    }

    .page-u888__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-u888__card {
      background-color: var(--page-u888-card-background);
      border-radius: var(--page-u888-border-radius);
      box-shadow: var(--page-u888-box-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      box-sizing: border-box;
    }

    .page-u888__card:hover {
      transform: translateY(-5px);
    }

    .page-u888__card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      max-width: 100%;
      display: block;
    }

    .page-u888__card-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-u888__card-title {
      font-size: 1.4em;
      color: var(--page-u888-primary-color);
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-u888__card-description {
      font-size: 0.95em;
      color: #666;
      margin-bottom: 15px;
      flex-grow: 1;
      word-wrap: break-word; /* Ensure text wraps */
      overflow-wrap: break-word;
    }

    .page-u888__list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      grid-template-columns: 1fr;
      gap: 15px;
    }

    .page-u888__list-item {
      background-color: var(--page-u888-card-background);
      padding: 20px;
      border-radius: var(--page-u888-border-radius);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: flex-start;
      text-align: left;
      box-sizing: border-box;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-u888__list-item::before {
      content: '✔';
      color: var(--page-u888-accent-color);
      font-weight: bold;
      margin-right: 10px;
      font-size: 1.2em;
      line-height: 1;
    }

    .page-u888__steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 25px;
      margin-top: 30px;
    }

    .page-u888__step-item {
      background-color: var(--page-u888-card-background);
      border-radius: var(--page-u888-border-radius);
      box-shadow: var(--page-u888-box-shadow);
      padding: 25px;
      text-align: center;
      flex: 1 1 calc(33% - 30px); /* 3 items per row on desktop */
      max-width: calc(33% - 30px);
      min-width: 280px;
      box-sizing: border-box;
    }

    .page-u888__step-number {
      background-color: var(--page-u888-primary-color);
      color: var(--page-u888-light-text-color);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8em;
      font-weight: bold;
      margin: 0 auto 20px;
    }

    .page-u888__step-title {
      font-size: 1.3em;
      color: var(--page-u888-primary-color);
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-u888__app-download-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 30px;
    }

    .page-u888__app-platform {
      background-color: var(--page-u888-card-background);
      border-radius: var(--page-u888-border-radius);
      box-shadow: var(--page-u888-box-shadow);
      padding: 30px;
      text-align: center;
      flex: 1 1 calc(50% - 30px); /* 2 items per row on desktop */
      max-width: calc(50% - 30px);
      min-width: 280px;
      box-sizing: border-box;
    }

    .page-u888__app-icon {
      width: 100px;
      height: 100px;
      margin-bottom: 20px;
      max-width: 100%;
      height: auto;
    }

    .page-u888__app-qr-code {
      width: 180px;
      height: 180px;
      margin-top: 20px;
      border: 5px solid var(--page-u888-primary-color);
      border-radius: var(--page-u888-border-radius);
      max-width: 100%;
      height: auto;
    }

    /* FAQ Section Styles */
    .page-u888__faq-section {
      background-color: var(--page-u888-card-background);
      padding: 40px 20px;
      border-radius: var(--page-u888-border-radius);
      box-shadow: var(--page-u888-box-shadow);
      margin: 40px auto;
      max-width: 900px;
      box-sizing: border-box;
    }

    .page-u888__faq-item {
      border-bottom: 1px solid #eee;
      margin-bottom: 10px;
      box-sizing: border-box;
    }

    .page-u888__faq-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
    }

    .page-u888__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px;
      cursor: pointer;
      user-select: none;
      background-color: #f9f9f9;
      border-radius: var(--page-u888-border-radius);
      transition: background-color 0.3s ease;
      box-sizing: border-box;
    }

    .page-u888__faq-question:hover {
      background-color: #f0f0f0;
    }

    .page-u888__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--page-u888-text-color);
      flex-grow: 1;
      text-align: left;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-u888__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-u888-primary-color);
      margin-left: 15px;
      pointer-events: none; /* Prevent toggle from blocking click */
      transition: transform 0.3s ease;
    }

    .page-u888__faq-item.active .page-u888__faq-toggle {
      transform: rotate(45deg); /* Change + to X or similar */
      content: '−'; /* Visually change to minus, JS handles actual text */
    }

    .page-u888__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      background-color: #ffffff;
      border-radius: 0 0 var(--page-u888-border-radius) var(--page-u888-border-radius);
      box-sizing: border-box;
    }

    .page-u888__faq-item.active .page-u888__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: 20px 15px !important;
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-u888__hero-title {
        font-size: 2em;
      }

      .page-u888__hero-subtitle {
        font-size: 1em;
      }

      .page-u888__title {
        font-size: 1.8em;
      }

      .page-u888__subtitle {
        font-size: 1.2em;
      }

      .page-u888__section {
        padding: 30px 15px;
      }

      .page-u888__grid {
        grid-template-columns: 1fr;
      }

      .page-u888__list {
        grid-template-columns: 1fr;
        padding: 0;
        margin-left: 0 !important;
        margin-right: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }

      .page-u888__list-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 15px !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
      }

      .page-u888__steps {
        flex-direction: column;
        align-items: center;
      }

      .page-u888__step-item {
        flex: 1 1 100%;
        max-width: 100%;
      }

      .page-u888__app-download-grid {
        flex-direction: column;
        align-items: center;
      }

      .page-u888__app-platform {
        flex: 1 1 100%;
        max-width: 100%;
      }

      .page-u888__floating-button {
        padding: 12px 20px;
        font-size: 0.9em;
      }

      .page-u888__faq-question h3 {
        font-size: 1em;
      }

      .page-u888__faq-answer {
        padding: 15px 10px !important;
      }

      .page-u888__card-image {
        height: 180px;
      }
    }

    @media (max-width: 480px) {
      .page-u888__hero-title {
        font-size: 1.6em;
      }

      .page-u888__hero-subtitle {
        font-size: 0.9em;
      }

      .page-u888__floating-button {
        bottom: 10px;
        font-size: 0.8em;
        padding: 10px 15px;
      }
    }