.page-khuyen-mai {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333333; /* Default dark text for light background */
  background-color: var(--background-color, #ffffff);
}

.page-khuyen-mai__hero-section {
  position: relative;
  padding-top: 10px; /* Small top padding, body handles --header-offset */
  margin-bottom: 40px;
  text-align: center;
  background-color: #f0f8ff; /* Light blue tint for hero background */
  overflow: hidden;
}

.page-khuyen-mai__hero-image-wrapper {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  overflow: hidden;
}

.page-khuyen-mai__hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-khuyen-mai__hero-content {
  padding: 40px 20px;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  margin-top: -80px; /* Overlap with image slightly for visual appeal */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.page-khuyen-mai__main-title {
  font-size: 2.8em;
  font-weight: 700;
  color: #26A9E0;
  margin-bottom: 15px;
  line-height: 1.2;
}

.page-khuyen-mai__lead-text {
  font-size: 1.2em;
  color: #555555;
  margin-bottom: 30px;
}

.page-khuyen-mai__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.page-khuyen-mai__btn {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, transform 0.2s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-khuyen-mai__btn--primary {
  background-color: #26A9E0;
  color: #ffffff;
  border: 2px solid #26A9E0;
}

.page-khuyen-mai__btn--primary:hover {
  background-color: #1e8bbd;
  transform: translateY(-2px);
}

.page-khuyen-mai__btn--secondary {
  background-color: #ffffff;
  color: #26A9E0;
  border: 2px solid #26A9E0;
}

.page-khuyen-mai__btn--secondary:hover {
  background-color: #e6f7ff;
  transform: translateY(-2px);
}

.page-khuyen-mai__section {
  padding: 40px 0;
  margin-bottom: 20px;
  background-color: #ffffff;
}

.page-khuyen-mai__section--about {
  background-color: #f9f9f9;
}

.page-khuyen-mai__container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.page-khuyen-mai__container--center {
  text-align: center;
}

.page-khuyen-mai__section-title {
  font-size: 2.2em;
  color: #26A9E0;
  text-align: center;
  margin-bottom: 30px;
  font-weight: 700;
}

.page-khuyen-mai__paragraph {
  font-size: 1.05em;
  line-height: 1.7;
  margin-bottom: 1em;
  color: #444444;
}

.page-khuyen-mai__highlight {
  color: #26A9E0;
  font-weight: bold;
}

.page-khuyen-mai__promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.page-khuyen-mai__promo-card {
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 25px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.page-khuyen-mai__promo-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.page-khuyen-mai__promo-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 20px;
  display: block;
  object-fit: cover;
}

.page-khuyen-mai__promo-title {
  font-size: 1.5em;
  color: #26A9E0;
  margin-bottom: 10px;
  font-weight: 600;
}

.page-khuyen-mai__promo-description {
  font-size: 0.95em;
  color: #666666;
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.page-khuyen-mai__btn--small {
  padding: 8px 18px;
  font-size: 0.9em;
}

.page-khuyen-mai__list {
  list-style: disc;
  margin-left: 20px;
  margin-bottom: 1.5em;
  color: #444444;
}

.page-khuyen-mai__list-item {
  margin-bottom: 0.8em;
  font-size: 1.05em;
}

.page-khuyen-mai__list--checkmarks {
  list-style: none;
  padding-left: 0;
}

.page-khuyen-mai__list--checkmarks .page-khuyen-mai__list-item::before {
  content: '✓';
  color: #26A9E0;
  font-weight: bold;
  display: inline-block;
  width: 1.5em;
  margin-left: -1.5em;
}

.page-khuyen-mai__link {
  color: #EA7C07; /* Login color for links */
  text-decoration: underline;
}

.page-khuyen-mai__link:hover {
  color: #c06506;
}

.page-khuyen-mai__steps-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-top: 30px;
}

.page-khuyen-mai__step-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background-color: #f9f9f9;
  border-left: 5px solid #26A9E0;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.page-khuyen-mai__step-number {
  font-size: 1.8em;
  font-weight: bold;
  color: #26A9E0;
  background-color: #e6f7ff;
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.page-khuyen-mai__step-content {
  flex-grow: 1;
}

.page-khuyen-mai__step-title {
  font-size: 1.3em;
  color: #26A9E0;
  margin-top: 0;
  margin-bottom: 10px;
}

.page-khuyen-mai__step-description {
  font-size: 1em;
  color: #555555;
}

.page-khuyen-mai__cta-buttons--center {
  margin-top: 40px;
}

.page-khuyen-mai__section--faq {
  background-color: #f0f8ff;
}

.page-khuyen-mai__faq-list {
  margin-top: 30px;
}

.page-khuyen-mai__faq-item {
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  margin-bottom: 15px;
  overflow: hidden;
}

.page-khuyen-mai__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  font-size: 1.15em;
  font-weight: 600;
  color: #333333;
  cursor: pointer;
  background-color: #ffffff;
  border-bottom: 1px solid #eeeeee;
  list-style: none; /* For <summary> tag */
}

.page-khuyen-mai__faq-question::-webkit-details-marker {
  display: none;
}

.page-khuyen-mai__faq-question:hover {
  background-color: #f5f5f5;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-question {
  border-bottom: 1px solid #dddddd;
}

.page-khuyen-mai__faq-toggle {
  font-size: 1.5em;
  font-weight: bold;
  color: #26A9E0;
  transition: transform 0.3s ease;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-toggle {
  transform: rotate(45deg);
}

.page-khuyen-mai__faq-answer {
  padding: 15px 25px 20px 25px;
  font-size: 1em;
  color: #555555;
  line-height: 1.7;
  border-top: 1px solid #f0f0f0;
}

.page-khuyen-mai__faq-answer .page-khuyen-mai__paragraph:last-child {
  margin-bottom: 0;
}

.page-khuyen-mai__copyright-section {
  background-color: #26A9E0;
  padding: 20px 0;
  text-align: center;
  margin-top: 40px;
}

.page-khuyen-mai__copyright-text {
  color: #ffffff;
  font-size: 0.9em;
  margin: 0;
}

/* --- Mobile Responsiveness (max-width: 768px) --- */
@media (max-width: 768px) {
  .page-khuyen-mai__hero-section {
    padding-top: 10px !important; /* Ensure small top padding on mobile */
    margin-bottom: 20px;
  }

  .page-khuyen-mai__hero-content {
    padding: 25px 15px;
    margin-top: -60px; /* Adjust overlap for smaller screens */
  }

  .page-khuyen-mai__main-title {
    font-size: 1.8em;
    margin-bottom: 10px;
  }

  .page-khuyen-mai__lead-text {
    font-size: 1em;
    margin-bottom: 20px;
  }

  .page-khuyen-mai__cta-buttons {
    flex-direction: column;
    gap: 10px;
    padding: 0 15px;
  }

  .page-khuyen-mai__btn,
  .page-khuyen-mai__btn--primary,
  .page-khuyen-mai__btn--secondary,
  .page-khuyen-mai a[class*="button"],
  .page-khuyen-mai a[class*="btn"] {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-khuyen-mai__section {
    padding: 25px 0;
    margin-bottom: 15px;
  }

  .page-khuyen-mai__container {
    padding: 0 15px;
  }

  .page-khuyen-mai__section-title {
    font-size: 1.6em;
    margin-bottom: 20px;
  }

  .page-khuyen-mai__paragraph,
  .page-khuyen-mai__list-item,
  .page-khuyen-mai__step-description,
  .page-khuyen-mai__promo-description,
  .page-khuyen-mai__faq-answer {
    font-size: 0.95em;
  }

  .page-khuyen-mai__promo-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-khuyen-mai__promo-card {
    padding: 20px;
  }

  .page-khuyen-mai__promo-image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  .page-khuyen-mai__promo-title {
    font-size: 1.3em;
  }

  .page-khuyen-mai__steps-list {
    gap: 20px;
  }

  .page-khuyen-mai__step-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 15px;
  }

  .page-khuyen-mai__step-number {
    margin-bottom: 10px;
  }

  .page-khuyen-mai__step-title {
    font-size: 1.2em;
  }

  .page-khuyen-mai__faq-question {
    padding: 15px 20px;
    font-size: 1em;
  }

  .page-khuyen-mai__faq-answer {
    padding: 10px 20px 15px 20px;
  }

  .page-khuyen-mai__copyright-section {
    padding: 15px 0;
  }

  .page-khuyen-mai img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  .page-khuyen-mai__section,
  .page-khuyen-mai__card,
  .page-khuyen-mai__container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-khuyen-mai__cta-buttons,
  .page-khuyen-mai__button-group,
  .page-khuyen-mai__btn-container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important;
    gap: 10px;
  }

  .page-khuyen-mai__cta-buttons {
    display: flex;
    flex-direction: column; /* Ensure vertical stacking on mobile */
  }
}