:root {
      --page-4twbet__primary-color: #0d47a1; /* Dark Blue */
      --page-4twbet__secondary-color: #ffc107; /* Amber Gold */
      --page-4twbet__text-color: #333;
      --page-4twbet__light-text-color: #fff;
      --page-4twbet__background-light: #f5f5f5;
      --page-4twbet__background-dark: #1a237e; /* Darker Blue */
      --page-4twbet__border-color: #e0e0e0;
      --page-4twbet__button-hover: #ffca28;
      --page-4twbet__button-active: #ffa000;
    }

    .page-4twbet {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-4twbet__text-color);
      background-color: var(--page-4twbet__background-light);
      padding-top: var(--header-offset, 122px); /* Fallback for header offset */
    }

    .page-4twbet__section {
      padding: 40px 15px;
      max-width: 1200px;
      margin: 0 auto;
      box-sizing: border-box;
    }

    .page-4twbet__section--dark {
      background-color: var(--page-4twbet__background-dark);
      color: var(--page-4twbet__light-text-color);
    }

    .page-4twbet__section-title {
      text-align: center;
      font-size: 2.5em;
      margin-bottom: 30px;
      color: var(--page-4twbet__primary-color);
      position: relative;
      padding-bottom: 10px;
    }

    .page-4twbet__section-title--light {
      color: var(--page-4twbet__light-text-color);
    }

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

    .page-4twbet__hero-section {
      background-color: var(--page-4twbet__background-dark);
      color: var(--page-4twbet__light-text-color);
      text-align: center;
      padding: 10px 15px 60px; /* Adjusted padding-top for header offset */
      position: relative;
      overflow: hidden;
    }

    .page-4twbet__hero-image {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      border-radius: 15px;
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    }

    .page-4twbet__hero-content {
      position: relative;
      z-index: 1;
      padding: 20px 0;
    }

    .page-4twbet__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      color: var(--page-4twbet__secondary-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-4twbet__hero-subtitle {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-4twbet__floating-buttons {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 15px;
      z-index: 1000;
    }

    .page-4twbet__button {
      background-color: var(--page-4twbet__secondary-color);
      color: var(--page-4twbet__primary-color);
      padding: 12px 25px;
      border: none;
      border-radius: 30px;
      font-size: 1.1em;
      font-weight: bold;
      cursor: pointer;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      transition: background-color 0.3s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .page-4twbet__button:hover {
      background-color: var(--page-4twbet__button-hover);
      transform: translateY(-2px);
    }

    .page-4twbet__button:active {
      background-color: var(--page-4twbet__button-active);
      transform: translateY(0);
    }

    .page-4twbet__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-4twbet__card {
      background-color: #fff;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      border: 1px solid var(--page-4twbet__border-color);
    }

    .page-4twbet__card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

    .page-4twbet__card-image {
      width: 100%;
      height: 200px; /* Fixed height for consistency */
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--page-4twbet__border-color);
    }

    .page-4twbet__card-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .page-4twbet__card-title {
      font-size: 1.5em;
      color: var(--page-4twbet__primary-color);
      margin-bottom: 10px;
    }

    .page-4twbet__card-description {
      font-size: 0.95em;
      color: #666;
      word-wrap: break-word; /* Ensure text wraps */
      overflow-wrap: break-word;
    }

    .page-4twbet__list {
      list-style: none;
      padding: 0;
      margin: 30px 0;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .page-4twbet__list-item {
      background-color: #fff;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      border-left: 5px solid var(--page-4twbet__secondary-color);
      box-sizing: border-box; /* Crucial for mobile responsiveness */
      transition: transform 0.2s ease;
    }

    .page-4twbet__list-item:hover {
      transform: translateX(5px);
    }

    .page-4twbet__list-item h3 {
      color: var(--page-4twbet__primary-color);
      margin-top: 0;
      font-size: 1.3em;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-4twbet__partners-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
      justify-items: center;
      align-items: center;
    }

    .page-4twbet__partner-logo {
      max-width: 100%;
      height: auto;
      display: block;
      filter: grayscale(80%);
      opacity: 0.7;
      transition: filter 0.3s ease, opacity 0.3s ease;
      min-width: 200px; /* Minimum size requirement */
      min-height: 100px; /* Minimum height, can be adjusted based on aspect ratio */
      object-fit: contain;
    }

    .page-4twbet__partner-logo:hover {
      filter: grayscale(0%);
      opacity: 1;
    }

    .page-4twbet__social-links {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 30px;
    }

    .page-4twbet__social-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 20px;
      background-color: var(--page-4twbet__primary-color);
      color: var(--page-4twbet__light-text-color);
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-4twbet__social-link:hover {
      background-color: var(--page-4twbet__background-dark);
      transform: translateY(-2px);
    }

    .page-4twbet__social-icon {
      width: 30px;
      height: 30px;
      vertical-align: middle;
      filter: invert(100%) brightness(200%); /* This is allowed only for monochrome icons to change color, not for general images. */
      /* No, wait, the rule says "禁止使用CSS filter属性改变图片颜色". I need to be careful.
         If the icons are themselves monochrome and I'm just tinting them to match the theme, it might be okay.
         But the prompt says "所有图片...必须保持其原始颜色".
         So, no filter for social icons either. I will remove the filter.
         If the icons are provided as images, they should be in their desired color already.
         I'll use placeholder images for social icons as well. */
      filter: none; /* Removed filter to comply with strict image color rules */
    }

    /* FAQ Section Styles */
    .page-4twbet__faq-container {
      max-width: 800px;
      margin: 40px auto;
      border-radius: 10px;
      background-color: #fff;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
    }

    .page-4twbet__faq-item {
      border-bottom: 1px solid var(--page-4twbet__border-color);
    }

    .page-4twbet__faq-item:last-child {
      border-bottom: none;
    }

    .page-4twbet__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: #f9f9f9;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-4twbet__faq-question:hover {
      background-color: #eee;
    }

    .page-4twbet__faq-question h3 {
      margin: 0;
      font-size: 1.15em;
      color: var(--page-4twbet__primary-color);
      flex-grow: 1;
      text-align: left;
      pointer-events: none; /* Prevent h3 from blocking click event */
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-4twbet__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-4twbet__secondary-color);
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-4twbet__faq-item.active .page-4twbet__faq-toggle {
      transform: rotate(45deg); /* Changes '+' to 'x' or '-' */
    }

    .page-4twbet__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      background-color: #fff;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: #555;
      font-size: 0.95em;
    }

    .page-4twbet__faq-item.active .page-4twbet__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    .page-4twbet__app-download-section {
      text-align: center;
      padding: 50px 15px;
      background-color: var(--page-4twbet__primary-color);
      color: var(--page-4twbet__light-text-color);
    }

    .page-4twbet__app-download-title {
      font-size: 2em;
      margin-bottom: 20px;
      color: var(--page-4twbet__secondary-color);
    }

    .page-4twbet__app-download-text {
      font-size: 1.1em;
      margin-bottom: 30px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-4twbet__download-button {
      background-color: var(--page-4twbet__secondary-color);
      color: var(--page-4twbet__primary-color);
      padding: 15px 35px;
      border-radius: 30px;
      text-decoration: none;
      font-size: 1.2em;
      font-weight: bold;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-4twbet__download-button:hover {
      background-color: var(--page-4twbet__button-hover);
      transform: translateY(-3px);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-4twbet__hero-title {
        font-size: 2.2em;
      }

      .page-4twbet__hero-subtitle {
        font-size: 1em;
      }

      .page-4twbet__section-title {
        font-size: 2em;
      }

      .page-4twbet__floating-buttons {
        gap: 10px;
        bottom: 15px;
      }

      .page-4twbet__button {
        padding: 10px 18px;
        font-size: 1em;
      }

      .page-4twbet__card-title {
        font-size: 1.3em;
      }

      .page-4twbet__list {
        grid-template-columns: 1fr; /* Stack items on small screens */
        padding: 0;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-4twbet__list-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 15px;
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-4twbet__card-image,
      .page-4twbet__hero-image,
      .page-4twbet__partner-logo,
      .page-4twbet__social-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-4twbet__social-links {
        flex-direction: column;
        align-items: center;
      }

      .page-4twbet__faq-question {
        padding: 15px 20px;
      }

      .page-4twbet__faq-question h3 {
        font-size: 1em;
      }

      .page-4twbet__faq-answer {
        padding: 15px 20px;
      }

      .page-4twbet__app-download-title {
        font-size: 1.8em;
      }

      .page-4twbet__download-button {
        padding: 12px 25px;
        font-size: 1.1em;
      }
    }

    @media (max-width: 480px) {
      .page-4twbet__hero-title {
        font-size: 1.8em;
      }

      .page-4twbet__section-title {
        font-size: 1.8em;
      }

      .page-4twbet__floating-buttons {
        bottom: 10px;
        gap: 8px;
      }

      .page-4twbet__button {
        padding: 8px 15px;
        font-size: 0.9em;
      }
    }