:root {
  --page-khuyen-mai-primary: #C61F1F;
  --page-khuyen-mai-secondary: #E53030;
  --page-khuyen-mai-button-gradient: linear-gradient(180deg, #FFB04A 0%, #D86A14 100%);
  --page-khuyen-mai-card-bg: #2A1212;
  --page-khuyen-mai-background: #140C0C;
  --page-khuyen-mai-text-main: #FFF1E8;
  --page-khuyen-mai-border: #6A1E1E;
  --page-khuyen-mai-gold: #F3C54D;
  --page-khuyen-mai-deep-red: #7E0D0D;
}

.page-khuyen-mai {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--page-khuyen-mai-text-main);
  background: var(--page-khuyen-mai-background);
}

.page-khuyen-mai__content-area {
  max-width: 1170px;
  margin: 0 auto;
  padding: 40px 16px;
  box-sizing: border-box;
}

.page-khuyen-mai__section-title {
  font-size: 2.5em;
  color: var(--page-khuyen-mai-gold);
  text-align: center;
  margin-bottom: 30px;
  font-weight: bold;
  line-height: 1.2;
}

.page-khuyen-mai__text-block {
  font-size: 1.1em;
  text-align: center;
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--page-khuyen-mai-text-main);
}

/* Hero Section */
.page-khuyen-mai__hero-section {
  padding-top: 10px; /* Small top padding, relying on body for header offset */
  padding-bottom: 60px;
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__hero-container {
  max-width: 1170px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 40px 16px;
  gap: 40px;
  box-sizing: border-box;
}

.page-khuyen-mai__hero-content {
  flex: 1 1 50%;
  min-width: 300px;
  text-align: left;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__main-title {
  font-size: clamp(2em, 4vw, 3.5em);
  color: var(--page-khuyen-mai-gold);
  margin-bottom: 20px;
  line-height: 1.2;
  font-weight: bold;
  max-width: 600px;
}

.page-khuyen-mai__hero-description {
  font-size: 1.2em;
  margin-bottom: 30px;
  max-width: 600px;
  color: var(--page-khuyen-mai-text-main);
}

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

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary,
.page-khuyen-mai__btn-text {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  text-align: center;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-khuyen-mai__btn-primary {
  background: var(--page-khuyen-mai-button-gradient);
  color: var(--page-khuyen-mai-text-main);
  border: none;
}

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

.page-khuyen-mai__btn-secondary {
  background: transparent;
  color: var(--page-khuyen-mai-gold);
  border: 2px solid var(--page-khuyen-mai-gold);
}

.page-khuyen-mai__btn-secondary:hover {
  background: var(--page-khuyen-mai-gold);
  color: var(--page-khuyen-mai-deep-red);
}

.page-khuyen-mai__hero-image {
  flex: 1 1 40%;
  min-width: 300px;
  text-align: center;
}

.page-khuyen-mai__hero-side-image {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  display: block;
}

/* Intro Section */
.page-khuyen-mai__intro-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
}

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

.page-khuyen-mai__feature-item {
  text-align: center;
  padding: 20px;
  background: var(--page-khuyen-mai-card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__icon-box-media {
  width: 240px;
  height: 240px;
  aspect-ratio: 1 / 1;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--page-khuyen-mai-gold);
  box-shadow: 0 0 0 8px rgba(243, 197, 77, 0.3);
}

.page-khuyen-mai__icon-box-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.page-khuyen-mai__feature-title {
  font-size: 1.5em;
  color: var(--page-khuyen-mai-gold);
  margin-bottom: 10px;
}

.page-khuyen-mai__feature-description {
  color: var(--page-khuyen-mai-text-main);
}

/* Promo Types Section */
.page-khuyen-mai__promo-types-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
  padding: 60px 0;
}

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

.page-khuyen-mai__promo-card {
  background: var(--page-khuyen-mai-card-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__promo-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

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

.page-khuyen-mai__promo-card-title {
  font-size: 1.4em;
  color: var(--page-khuyen-mai-gold);
  margin-bottom: 10px;
  line-height: 1.3;
}

.page-khuyen-mai__promo-card-description {
  font-size: 1em;
  margin-bottom: 20px;
  flex-grow: 1;
  color: var(--page-khuyen-mai-text-main);
}

/* Guide Section */
.page-khuyen-mai__guide-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
  padding: 60px 0;
}

.page-khuyen-mai__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-khuyen-mai__step-item {
  text-align: center;
  padding: 30px;
  background: var(--page-khuyen-mai-card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__step-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--page-khuyen-mai-gold);
  color: var(--page-khuyen-mai-deep-red);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2em;
  font-weight: bold;
  margin-bottom: 20px;
}

.page-khuyen-mai__step-title {
  font-size: 1.6em;
  color: var(--page-khuyen-mai-gold);
  margin-bottom: 15px;
}

.page-khuyen-mai__step-description {
  font-size: 1em;
  margin-bottom: 20px;
  flex-grow: 1;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__btn-text {
  color: var(--page-khuyen-mai-gold);
  text-decoration: underline;
  font-weight: bold;
  font-size: 1em;
  margin-top: auto;
}

.page-khuyen-mai__btn-text:hover {
  color: var(--page-khuyen-mai-primary);
}

/* Terms Section */
.page-khuyen-mai__terms-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
  padding: 60px 0;
}

.page-khuyen-mai__terms-list {
  list-style: disc;
  max-width: 800px;
  margin: 40px auto;
  padding-left: 25px;
  font-size: 1.1em;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__terms-list li {
  margin-bottom: 15px;
}

.page-khuyen-mai__terms-list strong {
  color: var(--page-khuyen-mai-gold);
}

/* Why Choose Section */
.page-khuyen-mai__why-choose-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
  padding: 60px 0;
}

.page-khuyen-mai__benefits-list {
  list-style: none;
  max-width: 800px;
  margin: 40px auto;
  padding: 0;
  font-size: 1.1em;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__benefits-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 15px;
}

.page-khuyen-mai__benefits-list li::before {
  content: '✓';
  color: var(--page-khuyen-mai-gold);
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* FAQ Section */
.page-khuyen-mai__faq-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
  padding: 60px 0;
}

.page-khuyen-mai__faq-list {
  max-width: 800px;
  margin: 40px auto 0;
}

.page-khuyen-mai__faq-item {
  background: var(--page-khuyen-mai-card-bg);
  border-radius: 8px;
  margin-bottom: 15px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--page-khuyen-mai-gold);
  cursor: pointer;
  list-style: none;
}

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

.page-khuyen-mai__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  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: 0 25px 20px;
  font-size: 1.1em;
  color: var(--page-khuyen-mai-text-main);
}

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

/* Call to Action Section */
.page-khuyen-mai__call-to-action-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
  text-align: center;
  padding: 60px 0;
}

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

/* All containers with images or content */
.page-khuyen-mai__section,
.page-khuyen-mai__card,
.page-khuyen-mai__container,
.page-khuyen-mai__hero-container,
.page-khuyen-mai__promo-card-grid,
.page-khuyen-mai__feature-grid,
.page-khuyen-mai__steps-grid,
.page-khuyen-mai__faq-list {
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

@media (max-width: 768px) {
  .page-khuyen-mai {
    font-size: 16px;
    line-height: 1.6;
  }

  .page-khuyen-mai__content-area {
    padding: 30px 15px;
  }

  .page-khuyen-mai__section-title {
    font-size: 2em;
    margin-bottom: 20px;
  }

  .page-khuyen-mai__text-block {
    font-size: 1em;
    margin-bottom: 30px;
  }

  /* HERO Section (768px) */
  .page-khuyen-mai__hero-section {
    padding-top: 10px !important;
    padding-bottom: 40px;
  }

  .page-khuyen-mai__hero-container {
    flex-direction: column;
    padding: 30px 15px;
    gap: 30px;
  }

  .page-khuyen-mai__hero-content {
    text-align: center;
    flex: 1 1 100%;
  }

  .page-khuyen-mai__main-title {
    font-size: clamp(1.8em, 7vw, 2.5em);
    margin-bottom: 15px;
  }

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

  .page-khuyen-mai__cta-buttons {
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 100%;
    padding: 0 15px;
    box-sizing: border-box;
  }

  .page-khuyen-mai__btn-primary,
  .page-khuyen-mai__btn-secondary {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding: 12px 15px;
  }

  .page-khuyen-mai__hero-image {
    flex: 1 1 100%;
    width: 100%;
  }
  
  .page-khuyen-mai__hero-side-image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  /* Module 1 (Intro Section - Feature Grid) (768px) */
  .page-khuyen-mai__feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-khuyen-mai__icon-box-media {
    width: 200px;
    height: 200px;
    margin-bottom: 15px;
  }

  /* Promo Types Section (768px) */
  .page-khuyen-mai__promo-types-section {
    padding: 40px 0;
  }

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

  .page-khuyen-mai__promo-card-image {
    height: 180px;
  }

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

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

  .page-khuyen-mai__promo-card-description {
    font-size: 0.95em;
  }

  /* Guide Section (768px) */
  .page-khuyen-mai__guide-section {
    padding: 40px 0;
  }

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

  .page-khuyen-mai__step-item {
    padding: 20px;
  }

  .page-khuyen-mai__step-icon {
    width: 50px;
    height: 50px;
    font-size: 1.8em;
    margin-bottom: 15px;
  }

  .page-khuyen-mai__step-title {
    font-size: 1.4em;
  }

  /* Terms Section (768px) */
  .page-khuyen-mai__terms-section {
    padding: 40px 0;
  }

  .page-khuyen-mai__terms-list {
    font-size: 1em;
    margin-top: 30px;
    padding-left: 20px;
  }

  /* Why Choose Section (768px) */
  .page-khuyen-mai__why-choose-section {
    padding: 40px 0;
  }

  .page-khuyen-mai__benefits-list {
    font-size: 1em;
    margin-top: 30px;
  }

  /* FAQ Section (768px) */
.page-khuyen-mai__faq-section {
  padding: 40px 0;
}

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

.page-khuyen-mai__faq-question {
  padding: 15px 20px;
  font-size: 1.1em;
}

.page-khuyen-mai__faq-answer {
  padding: 0 20px 15px;
  font-size: 1em;
}

  /* Call to Action Section (768px) */
  .page-khuyen-mai__call-to-action-section {
    padding: 40px 0;
  }

  /* Universal image sizing for mobile */
  .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__hero-container,
  .page-khuyen-mai__promo-card-grid,
  .page-khuyen-mai__feature-grid,
  .page-khuyen-mai__steps-grid,
  .page-khuyen-mai__faq-list {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }
}

/* Color Contrast Enforcement (assuming dark body bg, text-main is light) */
.page-khuyen-mai__hero-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__intro-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__promo-types-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__guide-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__terms-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__why-choose-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__faq-section {
  background: var(--page-khuyen-mai-deep-red);
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__call-to-action-section {
  background: var(--page-khuyen-mai-background);
  color: var(--page-khuyen-mai-text-main);
}

/* Ensure specific elements have appropriate colors */
.page-khuyen-mai p,
.page-khuyen-mai li,
.page-khuyen-mai__feature-description,
.page-khuyen-mai__promo-card-description,
.page-khuyen-mai__step-description,
.page-khuyen-mai__faq-answer {
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__card,
.page-khuyen-mai__feature-item,
.page-khuyen-mai__promo-card,
.page-khuyen-mai__step-item,
.page-khuyen-mai__faq-item {
  background: var(--page-khuyen-mai-card-bg);
  color: var(--page-khuyen-mai-text-main);
}

.page-khuyen-mai__section-title,
.page-khuyen-mai__feature-title,
.page-khuyen-mai__promo-card-title,
.page-khuyen-mai__step-title,
.page-khuyen-mai__faq-question,
.page-khuyen-mai__btn-secondary {
  color: var(--page-khuyen-mai-gold);
}
.page-khuyen-mai__btn-primary {
  color: var(--page-khuyen-mai-text-main);
}
.page-khuyen-mai__step-icon {
  background: var(--page-khuyen-mai-gold);
  color: var(--page-khuyen-mai-deep-red);
}