:root {
      --primary-color: #e44d26; /* Cam đậm */
      --secondary-color: #f7b731; /* Vàng cam */
      --dark-bg: #1a1a2e; /* Nền tối */
      --light-text: #ffffff; /* Chữ trắng */
      --gray-text: #cccccc; /* Chữ xám */
      --button-hover: #ff6f40;
      --border-radius-small: 8px;
      --border-radius-large: 15px;
      --spacing-unit: 16px;
    }

    /* Base styles for page-3app */
    .page-3app {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: var(--light-text);
      background-color: var(--dark-bg);
      line-height: 1.6;
      padding-bottom: 80px; /* Space for floating buttons */
    }

    .page-3app__section {
      padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
      max-width: 1200px;
      margin: 0 auto;
    }

    .page-3app__section--dark {
      background-color: #2a2a3e;
    }

    .page-3app__heading {
      text-align: center;
      color: var(--secondary-color);
      margin-bottom: calc(var(--spacing-unit) * 2);
      font-size: 2.2em;
      font-weight: 700;
    }

    .page-3app__sub-heading {
      text-align: center;
      color: var(--primary-color);
      margin-bottom: calc(var(--spacing-unit) * 1.5);
      font-size: 1.6em;
      font-weight: 600;
    }

    .page-3app__text {
      text-align: center;
      margin-bottom: var(--spacing-unit);
      color: var(--gray-text);
      font-size: 1.1em;
    }

    /* Hero Section */
    .page-3app__hero-section {
      position: relative;
      text-align: center;
      padding-top: 10px; /* Small decorative padding, assuming body has offset */
      padding-bottom: calc(var(--spacing-unit) * 3);
      background: linear-gradient(135deg, var(--dark-bg) 0%, #3a0000 100%);
      overflow: hidden;
    }

    .page-3app__hero-image {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      border-radius: var(--border-radius-large);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
      object-fit: cover;
      overflow: hidden;
    }

    .page-3app__hero-content {
      position: relative;
      z-index: 2;
      padding: var(--spacing-unit);
    }

    .page-3app__brand-name {
      font-size: 3.5em;
      font-weight: 900;
      color: var(--primary-color);
      text-shadow: 0 4px 10px rgba(0, 0, 0, 0.7);
      margin-bottom: var(--spacing-unit);
      text-align: center;
      line-height: 1;
    }

    .page-3app__hero-description {
      font-size: 1.3em;
      color: var(--light-text);
      margin-bottom: calc(var(--spacing-unit) * 2);
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Floating Buttons */
    .page-3app__floating-buttons {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: space-around;
      padding: var(--spacing-unit);
      background-color: rgba(26, 26, 46, 0.95); /* Semi-transparent dark background */
      box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      gap: var(--spacing-unit);
      box-sizing: border-box;
    }

    .page-3app__floating-button {
      flex: 1;
      padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
      font-size: 1.2em;
      font-weight: 700;
      text-align: center;
      border-radius: var(--border-radius-large);
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.2s ease;
      white-space: nowrap;
      text-decoration: none;
      color: var(--light-text);
      border: none;
    }

    .page-3app__floating-button--register {
      background-color: var(--primary-color);
    }

    .page-3app__floating-button--register:hover {
      background-color: var(--button-hover);
      transform: translateY(-2px);
    }

    .page-3app__floating-button--login {
      background-color: #007bff; /* Blue for login */
    }

    .page-3app__floating-button--login:hover {
      background-color: #0056b3;
      transform: translateY(-2px);
    }

    /* Promotions Section */
    .page-3app__promotion-card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: calc(var(--spacing-unit) * 1.5);
      margin-top: calc(var(--spacing-unit) * 2);
    }

    .page-3app__promotion-card {
      background-color: #2a2a3e;
      border-radius: var(--border-radius-large);
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease;
      text-align: center;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .page-3app__promotion-card:hover {
      transform: translateY(-5px);
    }

    .page-3app__promotion-image-container {
      width: 100%;
      max-height: 200px;
      overflow: hidden;
    }

    .page-3app__promotion-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      max-width: 100% !important; 
      box-sizing: border-box !important;
    }

    .page-3app__promotion-content {
      padding: var(--spacing-unit);
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .page-3app__promotion-title {
      font-size: 1.3em;
      color: var(--primary-color);
      margin-bottom: var(--spacing-unit);
      font-weight: 700;
    }

    .page-3app__promotion-description {
      font-size: 0.95em;
      color: var(--gray-text);
      margin-bottom: var(--spacing-unit);
      flex-grow: 1;
    }

    .page-3app__action-button {
      display: inline-block;
      padding: 10px 20px;
      background-color: var(--secondary-color);
      color: var(--dark-bg);
      text-decoration: none;
      border-radius: var(--border-radius-small);
      font-weight: 600;
      transition: background-color 0.3s ease;
      margin-top: auto;
      border: none;
      cursor: pointer;
    }

    .page-3app__action-button:hover {
      background-color: #ffc107;
    }

    /* Game Categories Section */
    .page-3app__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: calc(var(--spacing-unit) * 1.5);
      margin-top: calc(var(--spacing-unit) * 2);
    }

    .page-3app__game-card {
      background-color: #2a2a3e;
      border-radius: var(--border-radius-large);
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease;
      text-align: center;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .page-3app__game-card:hover {
      transform: translateY(-5px);
    }

    .page-3app__game-image-container {
      width: 100%;
      max-height: 220px;
      overflow: hidden;
    }

    .page-3app__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      max-width: 100% !important; 
      box-sizing: border-box !important;
    }

    .page-3app__game-title {
      font-size: 1.4em;
      color: var(--secondary-color);
      padding: var(--spacing-unit);
      font-weight: 700;
    }

    /* Why Choose Us Section */
    .page-3app__feature-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: calc(var(--spacing-unit) * 1.5);
      margin-top: calc(var(--spacing-unit) * 2);
      padding: 0;
      list-style: none;
    }

    .page-3app__feature-item {
      background-color: #2a2a3e;
      border-radius: var(--border-radius-large);
      padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      text-align: center;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .page-3app__feature-title {
      font-size: 1.2em;
      color: var(--primary-color);
      margin-bottom: var(--spacing-unit);
      font-weight: 600;
    }

    .page-3app__feature-description {
      color: var(--gray-text);
      font-size: 0.95em;
    }

    /* Payment Methods & Game Providers */
    .page-3app__logo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: var(--spacing-unit);
      margin-top: calc(var(--spacing-unit) * 2);
      align-items: center;
      justify-items: center;
      padding: 0;
      list-style: none;
    }

    .page-3app__logo-item {
      background-color: #2a2a3e;
      border-radius: var(--border-radius-small);
      padding: var(--spacing-unit);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
      text-align: center;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-sizing: border-box;
      width: 100%;
    }

    .page-3app__logo-item a {
      display: block;
      width: 100%;
      height: 100%;
    }

    .page-3app__logo-image {
      max-width: 100%;
      max-height: 80px;
      height: auto;
      display: block;
      margin: 0 auto;
      object-fit: contain;
      max-width: 100% !important; 
      box-sizing: border-box !important;
    }

    /* FAQ Section */
    .page-3app__faq-container {
      margin-top: calc(var(--spacing-unit) * 2);
      padding: 0;
      list-style: none;
    }

    .page-3app__faq-item {
      background-color: #2a2a3e;
      border-radius: var(--border-radius-small);
      margin-bottom: var(--spacing-unit);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      overflow: hidden;
    }

    .page-3app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
      cursor: pointer;
      user-select: none;
      background-color: #3a3a5e;
      color: var(--light-text);
      font-size: 1.1em;
      font-weight: 600;
      transition: background-color 0.3s ease;
    }

    .page-3app__faq-question:hover {
      background-color: #4a4a7a;
    }

    .page-3app__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: var(--light-text);
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-3app__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      pointer-events: none; /* Prevent toggle icon from blocking click */
      transition: transform 0.3s ease;
    }

    .page-3app__faq-item.active .page-3app__faq-toggle {
      transform: rotate(45deg);
    }

    .page-3app__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 var(--spacing-unit);
      color: var(--gray-text);
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      font-size: 0.95em;
    }

    .page-3app__faq-item.active .page-3app__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5) !important;
      opacity: 1;
    }

    /* Responsive Adjustments */
    @media (max-width: 768px) {
      .page-3app__brand-name {
        font-size: 2.8em;
      }

      .page-3app__hero-description {
        font-size: 1.1em;
      }

      .page-3app__floating-buttons {
        flex-direction: row;
        padding: var(--spacing-unit);
      }

      .page-3app__floating-button {
        font-size: 1em;
        padding: 10px 15px;
      }

      .page-3app__heading {
        font-size: 1.8em;
      }

      .page-3app__sub-heading {
        font-size: 1.4em;
      }

      .page-3app__promotion-card-grid,
      .page-3app__game-grid,
      .page-3app__feature-list,
      .page-3app__logo-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-unit);
      }

      .page-3app__feature-item,
      .page-3app__logo-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: var(--spacing-unit);
      }

      .page-3app__logo-grid {
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-3app__logo-image,
      .page-3app__hero-image,
      .page-3app__promotion-image,
      .page-3app__game-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-3app__promotion-image-container,
      .page-3app__game-image-container {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }

      .page-3app__faq-answer {
        padding: 0 var(--spacing-unit) !important;
      }

      .page-3app__faq-item.active .page-3app__faq-answer {
        padding: var(--spacing-unit) var(--spacing-unit) !important;
      }

      .page-3app__faq-question {
        padding: var(--spacing-unit);
      }

      .page-3app__text, .page-3app__feature-description, .page-3app__promotion-description, .page-3app__faq-answer p {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }
    }

    @media (max-width: 480px) {
      .page-3app__brand-name {
        font-size: 2.2em;
      }
      .page-3app__floating-button {
        font-size: 0.9em;
        padding: 8px 10px;
      }
    }