/* Tổng quan và biến CSS */
    :root {
      --page-100usdt-primary-color: #007bff; /* Xanh dương */
      --page-100usdt-secondary-color: #6c757d; /* Xám */
      --page-100usdt-accent-color: #ffc107; /* Vàng */
      --page-100usdt-background-light: #f8f9fa; /* Trắng nhạt */
      --page-100usdt-background-dark: #343a40; /* Đen xám */
      --page-100usdt-text-light: #ffffff; /* Trắng */
      --page-100usdt-text-dark: #212529; /* Đen đậm */
      --page-100usdt-border-color: #dee2e6; /* Xám viền */
      --page-100usdt-padding-section: 60px 20px;
      --page-100usdt-max-width: 1200px;
    }

    /* Đảm bảo rằng body đã có padding-top từ shared.css để tránh header bị che */
    /* Nếu shared.css không có, uncomment dòng sau: */
    /* .page-100usdt { padding-top: var(--header-offset, 122px); } */

    .page-100usdt {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-100usdt-text-dark);
      overflow-x: hidden; /* Ngăn chặn tràn ngang */
    }

    .page-100usdt__container {
      max-width: var(--page-100usdt-max-width);
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-100usdt__section {
      padding: var(--page-100usdt-padding-section);
      text-align: center;
    }

    .page-100usdt__section--light {
      background-color: var(--page-100usdt-background-light);
    }

    .page-100usdt__section--dark {
      background-color: var(--page-100usdt-background-dark);
      color: var(--page-100usdt-text-light);
    }

    .page-100usdt__heading {
      font-size: 2.5em;
      margin-bottom: 20px;
      color: var(--page-100usdt-primary-color);
    }

    .page-100usdt__section--dark .page-100usdt__heading {
      color: var(--page-100usdt-accent-color);
    }

    .page-100usdt__subheading {
      font-size: 1.8em;
      margin-bottom: 15px;
      color: var(--page-100usdt-text-dark);
    }

    .page-100usdt__section--dark .page-100usdt__subheading {
      color: var(--page-100usdt-text-light);
    }

    .page-100usdt__paragraph {
      font-size: 1.1em;
      margin-bottom: 20px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-100usdt__button {
      display: inline-block;
      padding: 15px 30px;
      font-size: 1.2em;
      font-weight: bold;
      color: var(--page-100usdt-text-light);
      background-color: var(--page-100usdt-primary-color);
      border: none;
      border-radius: 5px;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.3s ease, transform 0.2s ease;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .page-100usdt__button:hover {
      background-color: #0056b3; /* Darker blue */
      transform: translateY(-2px);
    }

    .page-100usdt__button--accent {
      background-color: var(--page-100usdt-accent-color);
      color: var(--page-100usdt-text-dark);
    }

    .page-100usdt__button--accent:hover {
      background-color: #e0a800; /* Darker yellow */
    }

    /* Hero Section */
    .page-100usdt__hero-section {
      background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('[GALLERY:hero:1920x1080:betting,casino,modern,100usdt]') no-repeat center center / cover;
      color: var(--page-100usdt-text-light);
      padding: 100px 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 60vh;
      position: relative;
      padding-top: calc(100px + 10px); /* Small top padding for aesthetics, assuming body handles header offset */
    }

    .page-100usdt__hero-content {
      max-width: 900px;
      text-align: center;
    }

    .page-100usdt__hero-title {
      font-size: 3.5em;
      margin-bottom: 20px;
      color: var(--page-100usdt-accent-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-100usdt__hero-description {
      font-size: 1.3em;
      margin-bottom: 30px;
      color: var(--page-100usdt-text-light);
    }

    /* Features Section */
    .page-100usdt__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
      text-align: left;
    }

    .page-100usdt__feature-item {
      background-color: var(--page-100usdt-text-light);
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      box-sizing: border-box; /* Quan trọng cho responsive */
    }

    .page-100usdt__feature-item:hover {
      transform: translateY(-5px);
    }

    .page-100usdt__feature-icon {
      width: 150px; /* Tăng kích thước ảnh */
      height: 150px;
      margin-bottom: 20px;
      object-fit: contain;
      border-radius: 8px; /* Bo tròn nhẹ */
      max-width: 100%;
      height: auto;
    }

    .page-100usdt__feature-title {
      font-size: 1.5em;
      margin-bottom: 10px;
      color: var(--page-100usdt-primary-color);
    }

    .page-100usdt__feature-description {
      font-size: 1em;
      color: var(--page-100usdt-secondary-color);
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* How It Works Section */
    .page-100usdt__steps-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 40px;
    }

    .page-100usdt__step-item {
      background-color: var(--page-100usdt-text-light);
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
      width: calc(33% - 20px);
      min-width: 280px;
      max-width: 350px;
      text-align: center;
      position: relative;
      box-sizing: border-box; /* Quan trọng cho responsive */
    }

    .page-100usdt__step-number {
      font-size: 2.5em;
      font-weight: bold;
      color: var(--page-100usdt-primary-color);
      margin-bottom: 15px;
      display: block;
    }

    .page-100usdt__step-title {
      font-size: 1.4em;
      margin-bottom: 10px;
      color: var(--page-100usdt-text-dark);
    }

    .page-100usdt__step-description {
      font-size: 1em;
      color: var(--page-100usdt-secondary-color);
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* About Section */
    .page-100usdt__about-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 30px;
      margin-top: 40px;
      text-align: left;
    }

    .page-100usdt__about-text {
      flex: 1;
      min-width: 300px;
    }

    .page-100usdt__about-image-wrapper {
      flex: 1;
      min-width: 300px;
      text-align: center;
      box-sizing: border-box; /* Responsive */
    }

    .page-100usdt__about-image {
      max-width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    /* Call to Action Section */
    .page-100usdt__cta-section {
      background-color: var(--page-100usdt-primary-color);
      color: var(--page-100usdt-text-light);
      padding: var(--page-100usdt-padding-section);
    }

    .page-100usdt__cta-title {
      font-size: 2.8em;
      margin-bottom: 20px;
      color: var(--page-100usdt-text-light);
    }

    .page-100usdt__cta-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    /* FAQ Section */
    .page-100usdt__faq-list {
      margin-top: 40px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
      text-align: left;
    }

    .page-100usdt__faq-item {
      background-color: var(--page-100usdt-text-light);
      border: 1px solid var(--page-100usdt-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    }

    .page-100usdt__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 25px;
      cursor: pointer;
      background-color: var(--page-100usdt-background-light);
      font-size: 1.2em;
      font-weight: bold;
      color: var(--page-100usdt-text-dark);
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-100usdt__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-100usdt-text-dark);
      pointer-events: none; /* Ngăn chặn h3 chặn sự kiện click */
    }

    .page-100usdt__faq-question:hover {
      background-color: #e9ecef;
    }

    .page-100usdt__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--page-100usdt-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Ngăn chặn icon chặn sự kiện click */
    }

    .page-100usdt__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 0.3s ease;
      color: var(--page-100usdt-secondary-color);
      font-size: 1em;
      line-height: 1.8;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-100usdt__faq-item.active .page-100usdt__faq-answer {
      max-height: 2000px !important; /* Đủ lớn để chứa mọi nội dung */
      padding: 20px 25px !important;
      opacity: 1;
    }

    .page-100usdt__faq-item.active .page-100usdt__faq-toggle {
      transform: rotate(45deg); /* Chuyển '+' thành 'x' hoặc '-' */
    }

    /* Responsive */
    @media (max-width: 992px) {
      .page-100usdt__hero-title {
        font-size: 2.8em;
      }

      .page-100usdt__hero-description {
        font-size: 1.1em;
      }

      .page-100usdt__heading {
        font-size: 2em;
      }

      .page-100usdt__subheading {
        font-size: 1.5em;
      }

      .page-100usdt__cta-title {
        font-size: 2.2em;
      }

      .page-100usdt__about-content {
        flex-direction: column;
      }

      .page-100usdt__step-item {
        width: calc(50% - 20px);
      }
    }

    @media (max-width: 768px) {
      .page-100usdt__hero-section {
        padding: 80px 15px;
        min-height: 50vh;
        padding-top: calc(80px + 10px); /* Small top padding for aesthetics, assuming body handles header offset */
      }

      .page-100usdt__hero-title {
        font-size: 2.2em;
      }

      .page-100usdt__hero-description {
        font-size: 1em;
      }

      .page-100usdt__section {
        padding: 40px 15px;
      }

      .page-100usdt__heading {
        font-size: 1.8em;
      }

      .page-100usdt__subheading {
        font-size: 1.3em;
      }

      .page-100usdt__paragraph {
        font-size: 0.95em;
      }

      .page-100usdt__button {
        padding: 12px 25px;
        font-size: 1.1em;
      }

      .page-100usdt__features-grid,
      .page-100usdt__steps-list {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-100usdt__feature-item,
      .page-100usdt__step-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px;
      }

      .page-100usdt__cta-title {
        font-size: 1.8em;
      }

      .page-100usdt__cta-description {
        font-size: 1em;
      }

      /* FAQ Responsive */
      .page-100usdt__faq-question {
        padding: 15px 20px;
        font-size: 1.1em;
      }

      .page-100usdt__faq-question h3 {
        font-size: 1.1em;
      }

      .page-100usdt__faq-answer {
        padding: 0 20px;
        font-size: 0.95em;
      }

      .page-100usdt__faq-item.active .page-100usdt__faq-answer {
        padding: 15px 20px !important;
      }
    }

    @media (max-width: 480px) {
      .page-100usdt__hero-title {
        font-size: 1.8em;
      }

      .page-100usdt__hero-description {
        font-size: 0.9em;
      }

      .page-100usdt__heading {
        font-size: 1.5em;
      }

      .page-100usdt__subheading {
        font-size: 1.2em;
      }

      .page-100usdt__button {
        padding: 10px 20px;
        font-size: 1em;
      }
    }