/* Custom CSS Variables */
:root {
  --color-primary: #113B7A;
  --color-secondary: #1D5FD1;
  --button-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
  --card-bg: #10233F;
  --text-main: #F3F8FF;
  --text-secondary: #AFC4E8;
  --color-border: #244D84;
  --color-glow: #4FA8FF;
  --color-gold: #F2C14E;
  --color-divider: #1B3357;
  --color-deep-navy: #08162B;
}

/* Base Styles for Khuyến Mãi Page */
.page-khuyen-mai {
  background-color: var(--color-deep-navy); /* Dark background */
  color: var(--text-main); /* Light text for dark background */
  font-family: Arial, sans-serif;
  line-height: 1.6;
  padding-bottom: 50px; /* Ensure space above footer */
}

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

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

.page-khuyen-mai__hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: 10px; /* Small top padding, body handles header offset */
  padding-bottom: 40px;
  position: relative;
  overflow: hidden;
}

.page-khuyen-mai__hero-image-wrapper {
  width: 100%;
  max-height: 492px; /* Roughly 1920x492 aspect ratio for hero */
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

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

.page-khuyen-mai__hero-content {
  position: relative;
  z-index: 10;
  padding: 20px 20px 0;
  max-width: 800px;
}

.page-khuyen-mai__main-title {
  font-size: 3.2em;
  font-weight: bold;
  color: var(--color-gold); /* #F2C14E */
  margin-bottom: 15px;
  line-height: 1.2;
  text-shadow: 0 0 10px rgba(242, 193, 78, 0.5);
}

.page-khuyen-mai__intro-text {
  font-size: 1.2em;
  color: var(--text-secondary); /* #AFC4E8 */
  margin-bottom: 30px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.page-khuyen-mai__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
  flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
}

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.1em;
  transition: all 0.3s ease;
  max-width: 100%; /* Ensure button adapts to container */
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-khuyen-mai__btn-primary {
  background: var(--button-gradient); /* linear-gradient(180deg, #2B73F6 0%, #1144A6 100%) */
  color: var(--text-main); /* #F3F8FF */
  border: none;
  box-shadow: 0 4px 15px rgba(43, 115, 246, 0.4);
}

.page-khuyen-mai__btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(43, 115, 246, 0.6);
}

.page-khuyen-mai__btn-secondary {
  background: transparent;
  color: var(--color-glow); /* #4FA8FF */
  border: 2px solid var(--color-border); /* #244D84 */
}

.page-khuyen-mai__btn-secondary:hover {
  background: rgba(29, 95, 209, 0.2); /* Transparent secondary color */
  color: var(--color-glow); /* #4FA8FF */
  border-color: var(--color-glow); /* #4FA8FF */
  transform: translateY(-2px);
}

.page-khuyen-mai__section-title {
  font-size: 2.5em;
  color: var(--color-gold); /* #F2C14E */
  text-align: center;
  margin-bottom: 30px;
  font-weight: bold;
  text-shadow: 0 0 8px rgba(242, 193, 78, 0.3);
}

.page-khuyen-mai__text-block {
  font-size: 1.1em;
  color: var(--text-secondary); /* #AFC4E8 */
  margin-bottom: 20px;
  text-align: justify;
}

.page-khuyen-mai__overview-section,
.page-khuyen-mai__guide-section,
.page-khuyen-mai__terms-section,
.page-khuyen-mai__why-choose-section,
.page-khuyen-mai__faq-section,
.page-khuyen-mai__cta-bottom-section {
  background-color: var(--color-deep-navy); /* #08162B */
}

/* Promo Grid Section */
.page-khuyen-mai__promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.page-khuyen-mai__promo-card {
  background-color: var(--card-bg); /* #10233F */
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--color-border); /* #244D84 */
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-khuyen-mai__promo-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5);
}

.page-khuyen-mai__promo-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 20px;
  object-fit: cover;
  min-height: 200px;
}

.page-khuyen-mai__card-title {
  font-size: 1.6em;
  color: var(--color-gold); /* #F2C14E */
  margin-bottom: 15px;
  font-weight: bold;
}

.page-khuyen-mai__card-description {
  font-size: 1em;
  color: var(--text-secondary); /* #AFC4E8 */
  margin-bottom: 20px;
  flex-grow: 1;
  text-align: justify;
}

.page-khuyen-mai__btn-small {
  padding: 10px 20px;
  font-size: 0.95em;
  margin-top: auto; /* Push button to bottom */
}

/* Guide Section */
.page-khuyen-mai__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 30px;
  margin-bottom: 40px;
}

.page-khuyen-mai__step-card {
  background-color: var(--card-bg); /* #10233F */
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  text-align: center;
  border: 1px solid var(--color-border); /* #244D84 */
}

.page-khuyen-mai__step-icon {
  background: var(--button-gradient); /* linear-gradient(180deg, #2B73F6 0%, #1144A6 100%) */
  color: var(--text-main); /* #F3F8FF */
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2em;
  font-weight: bold;
  margin: 0 auto 20px;
  box-shadow: 0 0 15px rgba(43, 115, 246, 0.5);
}

.page-khuyen-mai__step-title {
  font-size: 1.5em;
  color: var(--color-gold); /* #F2C14E */
  margin-bottom: 10px;
}

.page-khuyen-mai__step-description {
  font-size: 1em;
  color: var(--text-secondary); /* #AFC4E8 */
  margin-bottom: 20px;
}

.page-khuyen-mai__guide-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  margin-top: 20px;
  min-height: 200px;
  object-fit: cover;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Terms Section */
.page-khuyen-mai__terms-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
}

.page-khuyen-mai__terms-item {
  background-color: var(--card-bg); /* #10233F */
  border: 1px solid var(--color-border); /* #244D84 */
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 15px;
  font-size: 1.1em;
  color: var(--text-secondary); /* #AFC4E8 */
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__terms-item strong {
  color: var(--text-main); /* #F3F8FF */
}

.page-khuyen-mai__btn-full-width {
  width: 100%;
  display: block;
  margin-top: 30px;
}

/* Why Choose Section */
.page-khuyen-mai__advantage-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.page-khuyen-mai__advantage-item {
  background-color: var(--card-bg); /* #10233F */
  border: 1px solid var(--color-border); /* #244D84 */
  border-radius: 8px;
  padding: 20px;
  font-size: 1.1em;
  color: var(--text-secondary); /* #AFC4E8 */
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__advantage-item strong {
  color: var(--text-main); /* #F3F8FF */
  display: block;
  margin-bottom: 10px;
}

/* FAQ Section */
.page-khuyen-mai__faq-list {
  margin-top: 30px;
}

.page-khuyen-mai__faq-item {
  background-color: var(--card-bg); /* #10233F */
  border: 1px solid var(--color-border); /* #244D84 */
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  cursor: pointer;
  font-size: 1.2em;
  color: var(--text-main); /* #F3F8FF */
  font-weight: bold;
  background-color: var(--card-bg); /* #10233F */
  border-bottom: 1px solid transparent; /* default */
  transition: background-color 0.3s ease;
}

.page-khuyen-mai__faq-question:hover {
  background-color: rgba(20, 35, 63, 0.8); /* Slightly lighter on hover */
}

.page-khuyen-mai__faq-qtext {
  flex-grow: 1;
}

.page-khuyen-mai__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  margin-left: 15px;
  transition: transform 0.3s ease;
  color: var(--color-gold); /* #F2C14E */
}

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

.page-khuyen-mai__faq-answer {
  padding: 0 20px 20px;
  font-size: 1em;
  color: var(--text-secondary); /* #AFC4E8 */
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease-out, padding 0.5s ease-out;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-answer {
  max-height: 500px; /* Adjust as needed for content */
  padding-top: 10px;
  padding-bottom: 20px;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-question {
  border-bottom: 1px solid var(--color-divider); /* #1B3357 */
}

/* CTA Bottom Section */
.page-khuyen-mai__cta-bottom-content {
  text-align: center;
  padding: 50px 20px;
  background-color: var(--card-bg); /* #10233F */
  border-radius: 12px;
  border: 1px solid var(--color-border); /* #244D84 */
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  margin-top: 40px;
}

.page-khuyen-mai__btn-large {
  padding: 16px 40px;
  font-size: 1.2em;
  margin-top: 30px;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .page-khuyen-mai__main-title {
    font-size: 2.8em;
  }

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

@media (max-width: 768px) {
  .page-khuyen-mai__container {
    padding: 0 15px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-khuyen-mai__section {
    padding: 30px 0;
  }

  .page-khuyen-mai__hero-section {
    padding-top: 10px !important; /* Small top padding, body handles header offset */
    padding-bottom: 30px;
  }

  .page-khuyen-mai__main-title {
    font-size: 2.2em !important;
    margin-bottom: 10px;
  }

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

  .page-khuyen-mai__cta-buttons {
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
  }

  .page-khuyen-mai__btn-primary,
  .page-khuyen-mai__btn-secondary {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-khuyen-mai__section-title {
    font-size: 1.8em !important;
    margin-bottom: 20px;
  }

  .page-khuyen-mai__text-block {
    font-size: 0.95em;
  }

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

  .page-khuyen-mai__promo-card,
  .page-khuyen-mai__step-card,
  .page-khuyen-mai__terms-item,
  .page-khuyen-mai__advantage-item,
  .page-khuyen-mai__faq-item {
    padding: 20px;
  }

  .page-khuyen-mai__promo-image,
  .page-khuyen-mai__guide-image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    min-height: 200px !important;
    box-sizing: border-box !important;
  }

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

  .page-khuyen-mai__card-description,
  .page-khuyen-mai__step-description,
  .page-khuyen-mai__terms-item,
  .page-khuyen-mai__advantage-item,
  .page-khuyen-mai__faq-answer p {
    font-size: 0.9em;
  }

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

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

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

  .page-khuyen-mai__faq-answer {
    padding: 0 20px 15px;
  }

  .page-khuyen-mai__cta-bottom-content {
    padding: 40px 15px;
  }

  .page-khuyen-mai__btn-large {
    padding: 14px 30px;
    font-size: 1.1em;
  }
}

@media (max-width: 480px) {
  .page-khuyen-mai__main-title {
    font-size: 1.8em !important;
  }
  .page-khuyen-mai__section-title {
    font-size: 1.6em !important;
  }
  .page-khuyen-mai__hero-content {
    padding: 15px 10px 0;
  }
  .page-khuyen-mai__cta-buttons {
    gap: 10px;
  }
  .page-khuyen-mai__btn-primary,
  .page-khuyen-mai__btn-secondary {
    padding: 12px 15px;
    font-size: 0.9em;
  }
  .page-khuyen-mai__promo-card,
  .page-khuyen-mai__step-card,
  .page-khuyen-mai__terms-item,
  .page-khuyen-mai__advantage-item,
  .page-khuyen-mai__faq-item {
    padding: 15px;
  }
  .page-khuyen-mai__card-title {
    font-size: 1.2em;
  }
  .page-khuyen-mai__step-title {
    font-size: 1.1em;
  }
  .page-khuyen-mai__faq-question {
    font-size: 1em;
  }
  .page-khuyen-mai__faq-answer {
    padding: 0 15px 10px;
  }
  .page-khuyen-mai__cta-bottom-content {
    padding: 30px 15px;
  }
  .page-khuyen-mai__btn-large {
    padding: 12px 25px;
    font-size: 1em;
  }
}