:root {
      --go9f-primary-color: #e44d26; /* Cam đỏ */
      --go9f-secondary-color: #f7a600; /* Vàng cam */
      --go9f-dark-bg: #1a1a1a;
      --go9f-light-bg: #2a2a2a;
      --go9f-text-color: #ffffff;
      --go9f-grey-text: #cccccc;
      --go9f-border-color: #444444;
      --go9f-button-hover: #ff6a3d;
      --header-offset: 122px; /* Fallback if not provided by shared.css */
    }

    /* Base styles for the page-go9f scope */
    .page-go9f {
      font-family: 'Arial', sans-serif;
      color: var(--go9f-text-color);
      background-color: var(--go9f-dark-bg);
      line-height: 1.6;
      overflow-x: hidden;
      padding-top: var(--header-offset, 122px); /* Fallback to 122px if --header-offset is not defined in shared.css */
    }

    .page-go9f__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    .page-go9f__section {
      padding: 60px 20px;
      margin-bottom: 20px;
      background-color: var(--go9f-light-bg);
      border-radius: 10px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      text-align: center;
    }

    .page-go9f__section:nth-of-type(even) {
      background-color: var(--go9f-dark-bg);
    }

    .page-go9f__title {
      color: var(--go9f-primary-color);
      font-size: 2.8em;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .page-go9f__subtitle {
      color: var(--go9f-secondary-color);
      font-size: 1.8em;
      margin-bottom: 15px;
    }

    .page-go9f__text {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: var(--go9f-grey-text);
    }

    /* Hero Section */
    .page-go9f__hero-section {
      background: linear-gradient(135deg, var(--go9f-dark-bg) 0%, #3a0000 100%);
      padding: 10px 0 80px 0; /* Adjusted padding-top to avoid double offset */
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .page-go9f__hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      padding: 20px;
    }

    .page-go9f__hero-title {
      font-size: 3.5em;
      color: var(--go9f-secondary-color);
      margin-bottom: 25px;
      line-height: 1.2;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-go9f__hero-description {
      font-size: 1.4em;
      color: var(--go9f-text-color);
      margin-bottom: 40px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    }

    .page-go9f__hero-image {
      width: 100%;
      max-width: 800px;
      height: auto;
      border-radius: 15px;
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
      margin-top: 30px;
      object-fit: cover;
    }

    /* Floating Buttons */
    .page-go9f__floating-buttons {
      position: fixed;
      top: 50%;
      right: 15px;
      transform: translateY(-50%);
      display: flex;
      flex-direction: column;
      gap: 15px;
      z-index: 1000;
    }

    .page-go9f__floating-button {
      background-color: var(--go9f-primary-color);
      color: var(--go9f-text-color);
      padding: 12px 20px;
      border-radius: 30px;
      font-weight: bold;
      text-align: center;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
      transition: background-color 0.3s ease, transform 0.2s ease;
      font-size: 1.1em;
      min-width: 120px;
    }

    .page-go9f__floating-button:hover {
      background-color: var(--go9f-button-hover);
      transform: scale(1.05);
    }

    /* Product Grid */
    .page-go9f__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      padding: 30px 0;
    }

    .page-go9f__product-card {
      background-color: var(--go9f-dark-bg);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease;
      text-align: left;
      border: 1px solid var(--go9f-border-color);
    }

    .page-go9f__product-card:hover {
      transform: translateY(-8px);
    }

    .page-go9f__product-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      border-bottom: 1px solid var(--go9f-border-color);
    }

    .page-go9f__product-info {
      padding: 20px;
    }

    .page-go9f__product-name {
      font-size: 1.5em;
      color: var(--go9f-primary-color);
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-go9f__product-description {
      font-size: 0.95em;
      color: var(--go9f-grey-text);
      line-height: 1.5;
    }

    /* Features Section */
    .page-go9f__features-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      padding: 30px 0;
      list-style: none;
      margin: 0;
    }

    .page-go9f__feature-item {
      background-color: var(--go9f-dark-bg);
      border-radius: 10px;
      padding: 25px;
      text-align: center;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      border: 1px solid var(--go9f-border-color);
      transition: background-color 0.3s ease;
      box-sizing: border-box; /* Crucial for responsive list items */
    }

    .page-go9f__feature-item:hover {
      background-color: #333333;
    }

    .page-go9f__feature-icon {
      width: 250px; /* Increased size from 64px */
      height: 200px; /* Increased size from 64px */
      object-fit: contain;
      margin-bottom: 15px;
    }

    .page-go9f__feature-title {
      font-size: 1.4em;
      color: var(--go9f-secondary-color);
      margin-bottom: 10px;
      font-weight: bold;
    }

    .page-go9f__feature-description {
      font-size: 1em;
      color: var(--go9f-grey-text);
    }

    /* Providers/Payments Grid */
    .page-go9f__logo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      padding: 30px 0;
    }

    .page-go9f__logo-item {
      background-color: var(--go9f-dark-bg);
      border-radius: 8px;
      padding: 15px;
      display: flex;
      justify-content: center;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
      border: 1px solid var(--go9f-border-color);
      transition: transform 0.2s ease;
      min-height: 100px;
      box-sizing: border-box; /* Crucial for responsive list items */
    }

    .page-go9f__logo-item:hover {
      transform: translateY(-5px);
    }

    .page-go9f__logo-image {
      max-width: 100%;
      max-height: 80px;
      object-fit: contain;
      filter: grayscale(100%) brightness(1.5); /* Allowed for stylistic effect, not color change */
      transition: filter 0.3s ease;
    }

    .page-go9f__logo-item:hover .page-go9f__logo-image {
      filter: grayscale(0%) brightness(1);
    }

    /* FAQ Section */
    .page-go9f__faq-section {
      text-align: left;
    }

    .page-go9f__faq-list {
      list-style: none;
      padding: 0;
      margin: 30px 0;
    }

    .page-go9f__faq-item {
      background-color: var(--go9f-dark-bg);
      margin-bottom: 15px;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--go9f-border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    .page-go9f__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: var(--go9f-light-bg);
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }

    .page-go9f__faq-question:hover {
      background-color: #333333;
    }

    .page-go9f__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--go9f-text-color);
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-go9f__faq-toggle {
      font-size: 1.8em;
      color: var(--go9f-primary-color);
      font-weight: bold;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click */
    }

    .page-go9f__faq-item.active .page-go9f__faq-toggle {
      transform: rotate(45deg); /* Transforms '+' to 'x' or similar effect */
    }

    .page-go9f__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      color: var(--go9f-grey-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: 1em;
      line-height: 1.6;
    }

    .page-go9f__faq-item.active .page-go9f__faq-answer {
      max-height: 2000px !important; /* Sufficiently large value */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 1024px) {
      .page-go9f__hero-title {
        font-size: 3em;
      }
      .page-go9f__hero-description {
        font-size: 1.2em;
      }
      .page-go9f__title {
        font-size: 2.4em;
      }
      .page-go9f__subtitle {
        font-size: 1.6em;
      }
    }

    @media (max-width: 768px) {
      .page-go9f__hero-section {
        padding: 10px 0 60px 0;
      }
      .page-go9f__hero-title {
        font-size: 2.5em;
      }
      .page-go9f__hero-description {
        font-size: 1.1em;
      }
      .page-go9f__section {
        padding: 40px 15px;
      }
      .page-go9f__title {
        font-size: 2em;
      }
      .page-go9f__subtitle {
        font-size: 1.4em;
      }
      .page-go9f__text {
        font-size: 1em;
      }

      /* Floating buttons for mobile */
      .page-go9f__floating-buttons {
        flex-direction: row;
        width: 100%;
        bottom: 0;
        top: auto;
        left: 0;
        right: 0;
        transform: none;
        padding: 10px;
        background-color: rgba(26, 26, 26, 0.9);
        box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.3);
        justify-content: space-around;
        gap: 10px;
        border-top-left-radius: 10px;
        border-top-right-radius: 10px;
      }

      .page-go9f__floating-button {
        flex: 1;
        padding: 10px 15px;
        font-size: 1em;
        min-width: unset;
      }

      /* Responsive list items for product grid */
      .page-go9f__product-grid {
        grid-template-columns: 1fr;
        padding: 20px 0;
      }
      .page-go9f__product-card {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      /* Responsive list items for features list */
      .page-go9f__features-list {
        grid-template-columns: 1fr;
        padding: 20px 0;
      }
      .page-go9f__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px;
      }
      .page-go9f__feature-icon {
        width: 200px; /* Adjust for mobile */
        height: 150px; /* Adjust for mobile */
      }

      /* Responsive list items for logo grid */
      .page-go9f__logo-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        padding: 20px 0;
      }
      .page-go9f__logo-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 10px;
        min-height: 80px;
      }
      .page-go9f__logo-image {
        max-height: 60px;
      }

      /* FAQ adjustments for mobile */
      .page-go9f__faq-question {
        padding: 15px 20px;
      }
      .page-go9f__faq-question h3 {
        font-size: 1.1em;
      }
      .page-go9f__faq-answer {
        padding: 15px 20px;
      }
      .page-go9f__faq-item.active .page-go9f__faq-answer {
        padding: 15px 20px !important;
      }
    }

    @media (max-width: 480px) {
      .page-go9f__hero-title {
        font-size: 2em;
      }
      .page-go9f__hero-description {
        font-size: 0.95em;
      }
      .page-go9f__title {
        font-size: 1.8em;
      }
      .page-go9f__subtitle {
        font-size: 1.2em;
      }
      .page-go9f__floating-button {
        padding: 8px 12px;
        font-size: 0.9em;
      }
      .page-go9f__faq-question h3 {
        font-size: 1em;
      }
      .page-go9f__faq-answer {
        font-size: 0.9em;
      }
    }