:root {
      --page-keo-nh-cai-primary: #007bff; /* Xanh dương */
      --page-keo-nh-cai-secondary: #6c757d; /* Xám */
      --page-keo-nh-cai-accent: #ffc107; /* Vàng */
      --page-keo-nh-cai-background: #f8f9fa; /* Nền sáng */
      --page-keo-nh-cai-text-dark: #212529; /* Chữ tối */
      --page-keo-nh-cai-text-light: #ffffff; /* Chữ sáng */
      --page-keo-nh-cai-border: #dee2e6; /* Viền */
      --page-keo-nh-cai-shadow: rgba(0, 0, 0, 0.1);
      --page-keo-nh-cai-header-offset: 122px; /* Fallback, should be set by shared.css */
    }

    .page-keo-nh-cai {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-keo-nh-cai-text-dark);
      background-color: var(--page-keo-nh-cai-background);
      overflow-x: hidden;
    }

    .page-keo-nh-cai__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: var(--page-keo-nh-cai-text-light);
      border-radius: 8px;
      box-shadow: 0 4px 12px var(--page-keo-nh-cai-shadow);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      box-sizing: border-box;
    }

    .page-keo-nh-cai__hero-section {
      text-align: center;
      color: var(--page-keo-nh-cai-text-light);
      background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('[GALLERY:hero:1920x1080:sports,betting,stadium]') center/cover no-repeat;
      padding: calc(40px + 10px) 20px 60px; /* Small padding-top to decorate, assuming body already has header offset */
      position: relative;
      overflow: hidden;
      min-height: 400px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .page-keo-nh-cai__hero-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      font-weight: 700;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      color: var(--page-keo-nh-cai-text-light);
    }

    .page-keo-nh-cai__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      max-width: 800px;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
      color: var(--page-keo-nh-cai-text-light);
    }

    .page-keo-nh-cai__brand-keyword {
      font-size: 3em;
      font-weight: bold;
      margin-bottom: 20px;
      color: var(--page-keo-nh-cai-accent);
      text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8);
    }

    .page-keo-nh-cai__button-group {
      display: flex;
      gap: 15px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .page-keo-nh-cai__button {
      background-color: var(--page-keo-nh-cai-primary);
      color: var(--page-keo-nh-cai-text-light);
      padding: 12px 25px;
      border: none;
      border-radius: 5px;
      font-size: 1.1em;
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.2s ease;
      text-decoration: none;
      display: inline-block;
      text-align: center;
      white-space: nowrap;
    }

    .page-keo-nh-cai__button:hover {
      background-color: #0056b3;
      transform: translateY(-2px);
    }

    .page-keo-nh-cai__button--secondary {
      background-color: var(--page-keo-nh-cai-accent);
      color: var(--page-keo-nh-cai-text-dark);
    }

    .page-keo-nh-cai__button--secondary:hover {
      background-color: #e0a800;
    }

    .page-keo-nh-cai__heading {
      font-size: 2.2em;
      color: var(--page-keo-nh-cai-primary);
      text-align: center;
      margin-bottom: 30px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-keo-nh-cai__heading::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-keo-nh-cai-accent);
      border-radius: 2px;
    }

    .page-keo-nh-cai__content-text {
      font-size: 1.1em;
      margin-bottom: 20px;
      color: var(--page-keo-nh-cai-text-dark);
    }

    .page-keo-nh-cai__image-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
      justify-items: center; /* Center items in the grid */
    }

    .page-keo-nh-cai__image-card {
      background-color: var(--page-keo-nh-cai-background);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 8px var(--page-keo-nh-cai-shadow);
      text-align: center;
      transition: transform 0.3s ease;
      width: 100%;
      max-width: 400px; /* Limit card width */
      box-sizing: border-box;
    }

    .page-keo-nh-cai__image-card:hover {
      transform: translateY(-5px);
    }

    .page-keo-nh-cai__image-card-img {
      width: 100%;
      height: 250px; /* Fixed height for consistency */
      object-fit: cover;
      display: block;
      max-width: 100%;
    }

    .page-keo-nh-cai__image-card-title {
      font-size: 1.3em;
      color: var(--page-keo-nh-cai-primary);
      margin: 15px 0 10px;
      padding: 0 15px;
    }

    .page-keo-nh-cai__image-card-description {
      font-size: 0.95em;
      color: var(--page-keo-nh-cai-secondary);
      padding: 0 15px 20px;
    }

    .page-keo-nh-cai__list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
    }

    .page-keo-nh-cai__list-item {
      background-color: var(--page-keo-nh-cai-background);
      padding: 20px;
      border-left: 5px solid var(--page-keo-nh-cai-primary);
      border-radius: 5px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
      flex: 1;
      min-width: 280px;
      max-width: 450px;
      box-sizing: border-box;
      color: var(--page-keo-nh-cai-text-dark);
    }

    .page-keo-nh-cai__list-item-title {
      font-size: 1.2em;
      color: var(--page-keo-nh-cai-primary);
      margin-bottom: 10px;
    }

    .page-keo-nh-cai__step-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .page-keo-nh-cai__step-item {
      text-align: center;
      background-color: var(--page-keo-nh-cai-background);
      padding: 25px;
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-keo-nh-cai-shadow);
      transition: transform 0.3s ease;
      box-sizing: border-box;
    }

    .page-keo-nh-cai__step-item:hover {
      transform: translateY(-5px);
    }

    .page-keo-nh-cai__step-icon {
      width: 100px;
      height: 100px;
      margin-bottom: 15px;
      object-fit: contain;
      max-width: 100%;
    }

    .page-keo-nh-cai__step-number {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-keo-nh-cai-primary);
      margin-bottom: 10px;
    }

    .page-keo-nh-cai__step-title {
      font-size: 1.4em;
      color: var(--page-keo-nh-cai-text-dark);
      margin-bottom: 10px;
    }

    .page-keo-nh-cai__step-description {
      font-size: 1em;
      color: var(--page-keo-nh-cai-secondary);
    }

    .page-keo-nh-cai__faq-section {
      padding: 40px 20px;
      max-width: 900px;
      margin: 40px auto;
      background-color: var(--page-keo-nh-cai-text-light);
      border-radius: 8px;
      box-shadow: 0 4px 12px var(--page-keo-nh-cai-shadow);
      box-sizing: border-box;
    }

    .page-keo-nh-cai__faq-item {
      border-bottom: 1px solid var(--page-keo-nh-cai-border);
      padding: 15px 0;
    }

    .page-keo-nh-cai__faq-item:last-child {
      border-bottom: none;
    }

    .page-keo-nh-cai__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      padding: 10px 0;
      transition: background-color 0.3s ease;
    }

    .page-keo-nh-cai__faq-question:hover {
      background-color: #f1f1f1;
      border-radius: 5px;
    }

    .page-keo-nh-cai__faq-question-text {
      font-size: 1.15em;
      color: var(--page-keo-nh-cai-text-dark);
      font-weight: 600;
      flex-grow: 1;
      text-align: left;
      margin-right: 15px;
      pointer-events: none; /* Prevent text from blocking click event */
    }

    .page-keo-nh-cai__faq-toggle {
      font-size: 1.8em;
      color: var(--page-keo-nh-cai-primary);
      font-weight: bold;
      line-height: 1;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click event */
    }

    .page-keo-nh-cai__faq-item.active .page-keo-nh-cai__faq-toggle {
      transform: rotate(45deg);
    }

    .page-keo-nh-cai__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;
      color: var(--page-keo-nh-cai-secondary);
      font-size: 1em;
      line-height: 1.5;
    }

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

    /* Floating Register/Login Buttons */
    .page-keo-nh-cai__floating-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 1000;
    }

    .page-keo-nh-cai__floating-button {
      background-color: var(--page-keo-nh-cai-accent);
      color: var(--page-keo-nh-cai-text-dark);
      padding: 12px 20px;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      transition: background-color 0.3s ease, transform 0.2s ease;
      text-align: center;
      min-width: 120px;
    }

    .page-keo-nh-cai__floating-button:hover {
      background-color: #e0a800;
      transform: translateY(-3px);
    }

    .page-keo-nh-cai__floating-button--register {
      background-color: #28a745; /* Green for register */
      color: var(--page-keo-nh-cai-text-light);
    }

    .page-keo-nh-cai__floating-button--register:hover {
      background-color: #218838;
    }

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

      .page-keo-nh-cai__hero-subtitle {
        font-size: 1em;
      }

      .page-keo-nh-cai__brand-keyword {
        font-size: 2.2em;
      }

      .page-keo-nh-cai__section {
        padding: 30px 15px;
      }

      .page-keo-nh-cai__heading {
        font-size: 1.8em;
      }

      .page-keo-nh-cai__image-grid {
        grid-template-columns: 1fr;
      }

      .page-keo-nh-cai__list {
        flex-direction: column;
        gap: 15px;
        padding: 0;
        margin: 0;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }

      .page-keo-nh-cai__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;
        text-align: left;
      }

      .page-keo-nh-cai__step-grid {
        grid-template-columns: 1fr;
      }

      .page-keo-nh-cai__step-item {
        padding: 20px;
      }

      .page-keo-nh-cai__faq-section {
        padding: 25px 15px;
        margin: 20px auto;
      }

      .page-keo-nh-cai__faq-question-text {
        font-size: 1em;
      }

      .page-keo-nh-cai__faq-toggle {
        font-size: 1.5em;
      }

      .page-keo-nh-cai__faq-answer {
        padding: 15px 10px !important;
        font-size: 0.95em;
      }

      .page-keo-nh-cai__floating-buttons {
        bottom: 15px;
        right: 15px;
      }

      .page-keo-nh-cai__floating-button {
        padding: 10px 15px;
        min-width: 100px;
      }

      .page-keo-nh-cai__image-card-img {
        height: 200px;
      }

      img {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-keo-nh-cai__image-card {
        width: 100% !important;
        max-width: 100% !important;
      }
    }

    @media (max-width: 480px) {
      .page-keo-nh-cai__button-group {
        flex-direction: column;
        gap: 10px;
      }
      .page-keo-nh-cai__button {
        width: 100%;
      }
    }