:root {
      --primary-color: #e44d26; /* Màu cam đậm */
      --secondary-color: #f7b731; /* Màu vàng cam */
      --text-color: #333;
      --light-text-color: #f0f0f0;
      --background-dark: #1a1a1a;
      --background-light: #f9f9f9;
      --card-background: #ffffff;
      --border-color: #ddd;
      --hover-color: #ff6f42;
      --transition-speed: 0.3s ease;
      --header-offset: 122px; /* Fallback/default for header height */
    }

    .page-ph-n-th-ng-s-ng-b-c {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--text-color);
      background-color: var(--background-light);
      padding-top: 10px; /* Small padding, assuming body handles main header offset */
    }

    .page-ph-n-th-ng-s-ng-b-c__section {
      padding: 40px 15px;
      margin-bottom: 20px;
      border-radius: 8px;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      box-sizing: border-box;
    }

    .page-ph-n-th-ng-s-ng-b-c__section--dark {
      background-color: var(--background-dark);
      color: var(--light-text-color);
    }

    .page-ph-n-th-ng-s-ng-b-c__section--light {
      background-color: var(--card-background);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    .page-ph-n-th-ng-s-ng-b-c__heading-1 {
      font-size: 2.5em;
      color: var(--primary-color);
      text-align: center;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .page-ph-n-th-ng-s-ng-b-c__heading-2 {
      font-size: 2em;
      color: var(--primary-color);
      text-align: center;
      margin-bottom: 25px;
      font-weight: 600;
    }

    .page-ph-n-th-ng-s-ng-b-c__heading-3 {
      font-size: 1.5em;
      color: var(--primary-color);
      margin-bottom: 15px;
      font-weight: 500;
    }

    .page-ph-n-th-ng-s-ng-b-c__text-center {
      text-align: center;
    }

    .page-ph-n-th-ng-s-ng-b-c__paragraph {
      margin-bottom: 15px;
      font-size: 1.1em;
      line-height: 1.8;
    }

    .page-ph-n-th-ng-s-ng-b-c__image-container {
      text-align: center;
      margin: 30px 0;
    }

    .page-ph-n-th-ng-s-ng-b-c__image {
      max-width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
      display: block;
      margin: 0 auto;
    }

    .page-ph-n-th-ng-s-ng-b-c__button {
      display: inline-block;
      background-color: var(--primary-color);
      color: var(--light-text-color);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color var(--transition-speed);
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-ph-n-th-ng-s-ng-b-c__button:hover {
      background-color: var(--hover-color);
    }

    .page-ph-n-th-ng-s-ng-b-c__list {
      list-style: none;
      padding: 0;
      margin: 20px 0;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .page-ph-n-th-ng-s-ng-b-c__list-item {
      background-color: var(--card-background);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 20px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      transition: transform var(--transition-speed);
      box-sizing: border-box;
    }

    .page-ph-n-th-ng-s-ng-b-c__list-item:hover {
      transform: translateY(-5px);
    }

    .page-ph-n-th-ng-s-ng-b-c__list-item h3 {
      color: var(--primary-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    /* FAQ Section Styles */
    .page-ph-n-th-ng-s-ng-b-c__faq-section {
      background-color: var(--background-light);
      padding: 40px 15px;
      max-width: 1200px;
      margin: 20px auto;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      box-sizing: border-box;
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-item {
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 10px;
      padding-bottom: 10px;
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      padding: 15px 0;
      transition: background-color var(--transition-speed);
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-question:hover {
      background-color: #f0f0f0;
      border-radius: 5px;
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-question h3 {
      margin: 0;
      color: var(--text-color);
      font-size: 1.2em;
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click on parent */
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: var(--primary-color);
      margin-left: 15px;
      pointer-events: none; /* Prevent toggle icon from blocking click on parent */
    }

    .page-ph-n-th-ng-s-ng-b-c__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(--text-color);
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-item.active .page-ph-n-th-ng-s-ng-b-c__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 15px !important;
      opacity: 1;
    }

    .page-ph-n-th-ng-s-ng-b-c__faq-item.active .page-ph-n-th-ng-s-ng-b-c__faq-toggle {
      content: '−'; /* Changed by JS */
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-ph-n-th-ng-s-ng-b-c__heading-1 {
        font-size: 2em;
      }

      .page-ph-n-th-ng-s-ng-b-c__heading-2 {
        font-size: 1.6em;
      }

      .page-ph-n-th-ng-s-ng-b-c__heading-3 {
        font-size: 1.3em;
      }

      .page-ph-n-th-ng-s-ng-b-c__paragraph {
        font-size: 1em;
      }

      .page-ph-n-th-ng-s-ng-b-c__section {
        padding: 20px 10px;
      }

      .page-ph-n-th-ng-s-ng-b-c__list {
        grid-template-columns: 1fr;
        gap: 15px;
      }

      .page-ph-n-th-ng-s-ng-b-c__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-ph-n-th-ng-s-ng-b-c__list-item p {
        word-break: break-word !important;
      }

      .page-ph-n-th-ng-s-ng-b-c__faq-section {
        padding: 20px 10px;
      }

      .page-ph-n-th-ng-s-ng-b-c__faq-question h3 {
        font-size: 1.1em;
      }

      .page-ph-n-th-ng-s-ng-b-c__faq-toggle {
        font-size: 1.3em;
      }
      
      .page-ph-n-th-ng-s-ng-b-c__image-container {
        margin: 20px 0;
      }

      .page-ph-n-th-ng-s-ng-b-c__image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
    }