.page-khuyen-mai {
  font-family: 'Arial', sans-serif;
  color: #333333;
  background-color: #F5F7FA;
  line-height: 1.6;
}

.page-khuyen-mai__hero-section {
  position: relative;
  padding-top: 10px; /* Specific top padding, not var(--header-offset) */
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-bottom: 40px;
  background-color: #F5F7FA;
}

.page-khuyen-mai__hero-image {
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  margin-bottom: 20px;
  box-sizing: border-box;
}

.page-khuyen-mai__hero-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 16/9;
  border-radius: 8px;
}

.page-khuyen-mai__hero-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 15px;
}

.page-khuyen-mai__hero-title {
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 700;
  color: #E53935;
  margin-bottom: 20px;
  line-height: 1.2;
}

.page-khuyen-mai__hero-description {
  font-size: 1.15rem;
  margin-bottom: 30px;
  color: #333333;
}

.page-khuyen-mai__cta-button {
  display: inline-block;
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
  padding: 15px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-khuyen-mai__cta-button:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.page-khuyen-mai__cta-button--secondary {
  background: #ffffff;
  color: #E53935;
  border: 2px solid #E53935;
}

.page-khuyen-mai__cta-button--secondary:hover {
  background: #f0f0f0;
  color: #E53935;
}

.page-khuyen-mai__cta-button--light {
  background: #ffffff;
  color: #E53935;
  border: 2px solid #E53935;
}

.page-khuyen-mai__cta-button--small {
  padding: 12px 25px;
  font-size: 1rem;
}

.page-khuyen-mai__section {
  padding: 60px 0;
  background-color: #F5F7FA;
}

.page-khuyen-mai__dark-section {
  background-color: #E53935;
  color: #ffffff;
}

.page-khuyen-mai__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

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

.page-khuyen-mai__section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: #E53935;
  text-align: center;
  margin-bottom: 25px;
  line-height: 1.3;
}

.page-khuyen-mai__section-title--light {
  color: #ffffff;
}

.page-khuyen-mai__section-description {
  font-size: 1.05rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto 40px;
  color: #333333;
}

.page-khuyen-mai__section-description--light {
  color: #f0f0f0;
}

.page-khuyen-mai__content-grid {
  display: flex;
  gap: 40px;
  align-items: center;
  margin-top: 30px;
}

.page-khuyen-mai__content-grid--reverse {
  flex-direction: row-reverse;
}

.page-khuyen-mai__text-block {
  flex: 1;
}

.page-khuyen-mai__image-block {
  flex: 1;
  max-width: 50%;
  box-sizing: border-box;
}

.page-khuyen-mai__image-block img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.page-khuyen-mai__sub-title {
  font-size: 1.6rem;
  font-weight: 600;
  color: #E53935;
  margin-bottom: 20px;
}

.page-khuyen-mai__sub-title--light {
  color: #FF5A4F;
}

.page-khuyen-mai__list {
  list-style: none;
  padding: 0;
  margin-bottom: 25px;
}

.page-khuyen-mai__list li {
  margin-bottom: 10px;
  font-size: 1.05rem;
  display: flex;
  align-items: flex-start;
}

.page-khuyen-mai__list-icon {
  color: #E53935;
  font-weight: bold;
  margin-right: 10px;
  font-size: 1.2em;
  line-height: 1;
  flex-shrink: 0;
}

.page-khuyen-mai__list--light li {
  color: #ffffff;
}

.page-khuyen-mai__list--light .page-khuyen-mai__list-icon {
  color: #FF5A4F;
}

.page-khuyen-mai__note {
  font-style: italic;
  margin-top: 20px;
  margin-bottom: 25px;
  font-size: 1rem;
  color: #555555;
}

.page-khuyen-mai__note--light {
  color: #e0e0e0;
}

.page-khuyen-mai__promo-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-khuyen-mai__card {
  background-color: #FFFFFF;
  border: 1px solid #E0E0E0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-khuyen-mai__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.page-khuyen-mai__card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.page-khuyen-mai__card-content {
  padding: 25px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.page-khuyen-mai__card-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: #E53935;
  margin-bottom: 15px;
}

.page-khuyen-mai__card-text {
  font-size: 1rem;
  color: #555555;
  margin-bottom: 20px;
  flex-grow: 1;
}

.page-khuyen-mai__card-button {
  display: inline-block;
  background: #FF5A4F;
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  transition: background-color 0.3s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-khuyen-mai__card-button:hover {
  background: #E53935;
}

.page-khuyen-mai__numbered-list {
  list-style: none;
  padding: 0;
  counter-reset: step-counter;
  margin-bottom: 25px;
}

.page-khuyen-mai__numbered-list li {
  counter-increment: step-counter;
  margin-bottom: 15px;
  font-size: 1.05rem;
  padding-left: 35px;
  position: relative;
  color: #333333;
}

.page-khuyen-mai__numbered-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  background-color: #E53935;
  color: #ffffff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9em;
}

.page-khuyen-mai__list-strong {
  color: #E53935;
}

.page-khuyen-mai__faq-list {
  margin-top: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

details.page-khuyen-mai__faq-item {
  margin-bottom: 15px;
  border-radius: 8px;
  border: 1px solid #E0E0E0;
  overflow: hidden;
  background: #FFFFFF;
}

details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
}

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

details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question:hover {
  background: #f5f5f5;
}

.page-khuyen-mai__faq-qtext {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: #333333;
}

.page-khuyen-mai__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: #E53935;
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
  transition: transform 0.3s ease;
}

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

details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer {
  padding: 0 20px 20px;
  background: #f9f9f9;
  border-radius: 0 0 8px 8px;
  color: #555555;
  font-size: 1rem;
}

.page-khuyen-mai__faq-answer p {
  margin: 0;
}

.page-khuyen-mai__support-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-top: 60px;
  padding: 30px;
  background-color: #FFFFFF;
  border-radius: 10px;
  border: 1px solid #E0E0E0;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.page-khuyen-mai__support-image {
  width: 150px;
  height: auto;
  margin-bottom: 20px;
}

.page-khuyen-mai__support-text {
  font-size: 1.1rem;
  margin-bottom: 30px;
  color: #333333;
  max-width: 600px;
}

.page-khuyen-mai__button-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 40px;
  width: 100%;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  box-sizing: border-box;
  overflow: hidden;
}

.page-khuyen-mai__button-group .page-khuyen-mai__cta-button {
  flex: 1;
  max-width: 300px;
  text-align: center;
}

/* General image responsiveness */
.page-khuyen-mai img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-khuyen-mai__section,
.page-khuyen-mai__card,
.page-khuyen-mai__container {
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
}

/* --- Mobile Responsive Styles (max-width: 768px) --- */
@media (max-width: 768px) {
  .page-khuyen-mai {
    font-size: 15px;
  }

  /* HERO 主图区域 */
  .page-khuyen-mai__hero-section {
    padding-top: 10px; /* Specific top padding for mobile */
    padding-bottom: 30px;
  }

  .page-khuyen-mai__hero-image img {
    object-fit: contain !important;
    aspect-ratio: unset !important;
    border-radius: 0;
  }

  .page-khuyen-mai__hero-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
  }

  .page-khuyen-mai__hero-description {
    font-size: 1rem;
    margin-bottom: 25px;
  }

  .page-khuyen-mai__cta-button {
    padding: 12px 20px;
    font-size: 1rem;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

  .page-khuyen-mai__section {
    padding: 40px 0;
  }

  .page-khuyen-mai__section-title {
    font-size: 1.6rem;
    margin-bottom: 20px;
    padding: 0 15px;
  }

  .page-khuyen-mai__section-description {
    font-size: 0.95rem;
    margin-bottom: 30px;
    padding: 0 15px;
  }

  /* 内容区图片与容器 */
  .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,
  .page-khuyen-mai__content-grid,
  .page-khuyen-mai__promo-cards-grid,
  .page-khuyen-mai__faq-list,
  .page-khuyen-mai__support-cta,
  .page-khuyen-mai__button-group {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-khuyen-mai__content-grid {
    flex-direction: column;
    gap: 30px;
  }

  .page-khuyen-mai__content-grid--reverse {
    flex-direction: column;
  }

  .page-khuyen-mai__image-block {
    max-width: 100%;
  }

  .page-khuyen-mai__sub-title {
    font-size: 1.4rem;
  }

  .page-khuyen-mai__list li,
  .page-khuyen-mai__numbered-list li {
    font-size: 1rem;
    padding-left: 30px;
  }

  .page-khuyen-mai__numbered-list li::before {
    width: 24px;
    height: 24px;
    font-size: 0.8em;
  }

  /* 产品展示图区域 (promo-cards-grid) */
  .page-khuyen-mai__promo-cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    overflow-x: hidden; /* Ensure no horizontal scroll */
  }

  .page-khuyen-mai__card-title {
    font-size: 1.2rem;
  }

  .page-khuyen-mai__card-text {
    font-size: 0.95rem;
  }

  .page-khuyen-mai__card-button {
    font-size: 0.9rem;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

  /* FAQ 区域 */
  details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question {
    padding: 15px;
  }

  .page-khuyen-mai__faq-qtext {
    font-size: 1rem;
  }

  .page-khuyen-mai__faq-toggle {
    font-size: 20px;
    width: 24px;
  }

  details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer {
    padding: 0 15px 15px;
  }

  .page-khuyen-mai__support-cta {
    padding: 20px;
  }

  .page-khuyen-mai__support-image {
    width: 120px;
  }

  .page-khuyen-mai__support-text {
    font-size: 1rem;
  }

  /* 按钮与按钮容器 */
  .page-khuyen-mai__button-group {
    flex-direction: column;
    gap: 15px;
    max-width: 100% !important;
    width: 100% !important;
  }

  .page-khuyen-mai__button-group .page-khuyen-mai__cta-button {
    max-width: 100% !important;
    width: 100% !important;
  }
}

/* --- Tablet Responsive Styles (max-width: 1024px) --- */
@media (max-width: 1024px) and (min-width: 769px) {
  .page-khuyen-mai__hero-title {
    font-size: 3rem;
  }

  .page-khuyen-mai__hero-description {
    font-size: 1.1rem;
  }

  .page-khuyen-mai__section-title {
    font-size: 2.2rem;
  }

  .page-khuyen-mai__promo-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-khuyen-mai__content-grid {
    flex-direction: column;
    gap: 30px;
  }

  .page-khuyen-mai__content-grid--reverse {
    flex-direction: column;
  }

  .page-khuyen-mai__image-block {
    max-width: 80%;
    margin: 0 auto;
  }

  .page-khuyen-mai__button-group {
    flex-wrap: wrap;
    padding: 0 15px;
  }

  .page-khuyen-mai__button-group .page-khuyen-mai__cta-button {
    flex: none;
    width: calc(50% - 10px);
  }
}