/* style/khuyen-mai.css */

:root {
  --primary-color: #C91F17;
  --secondary-color: #E53935;
  --button-gradient: linear-gradient(180deg, #FFD86A 0%, #E6B800 100%);
  --card-bg: #D32F2F;
  --section-bg: #B71C1C;
  --text-main-color: #FFF5E1;
  --border-color: #F2B544;
  --glow-color: #FFCC66;
  --gold-color: #F4D34D;
  --deep-red-color: #7A0E0E;
}

.page-khuyen-mai {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--text-main-color); /* Ensure high contrast with dark background */
  background-color: var(--section-bg); /* Main content background */
}

.page-khuyen-mai__container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 20px;
  box-sizing: border-box;
}

/* Hero Section */
.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: var(--deep-red-color);
  color: var(--text-main-color);
  overflow: hidden;
}

.page-khuyen-mai__hero-image-wrap {
  width: 100%;
  overflow: hidden;
  position: relative;
}

.page-khuyen-mai__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: brightness(0.7); /* Slightly darken image for text readability, not changing color */
}

.page-khuyen-mai__hero-content {
  padding: 40px 20px;
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, rgba(var(--deep-red-color), 0.8), var(--deep-red-color));
  margin-top: -5px; /* Slight overlap with image for visual flow */
}

.page-khuyen-mai__main-title {
  font-size: clamp(2em, 4vw, 3.2em);
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--gold-color);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  line-height: 1.2;
}

.page-khuyen-mai__subtitle {
  font-size: 1.15em;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-main-color);
}

.page-khuyen-mai__cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.page-khuyen-mai__btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  text-align: center;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-khuyen-mai__btn-primary {
  background: var(--button-gradient);
  color: #333333; /* Dark text on light gold button for contrast */
  border: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

.page-khuyen-mai__btn-secondary {
  background-color: var(--primary-color);
  color: var(--text-main-color);
  border: 2px solid var(--border-color);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__btn-secondary:hover {
  background-color: var(--secondary-color);
  border-color: var(--gold-color);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

/* General Section Styling */
.page-khuyen-mai__section {
  padding: 60px 0;
  margin-bottom: 20px;
  background-color: var(--section-bg);
  border-bottom: 1px solid rgba(var(--border-color), 0.2);
}

.page-khuyen-mai__section:last-of-type {
  border-bottom: none;
}

.page-khuyen-mai__section-title {
  font-size: 2.2em;
  font-weight: 700;
  color: var(--gold-color);
  text-align: center;
  margin-bottom: 30px;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
}

.page-khuyen-mai__sub-title {
  font-size: 1.6em;
  font-weight: 600;
  color: var(--gold-color);
  margin-top: 40px;
  margin-bottom: 20px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__text-block {
  font-size: 1.05em;
  margin-bottom: 20px;
  color: var(--text-main-color);
}

.page-khuyen-mai__list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 20px;
}

.page-khuyen-mai__list-item {
  position: relative;
  padding-left: 25px;
  margin-bottom: 10px;
  font-size: 1.05em;
  color: var(--text-main-color);
}

.page-khuyen-mai__list-item::before {
  content: '✔';
  position: absolute;
  left: 0;
  color: var(--gold-color);
  font-weight: bold;
}

.page-khuyen-mai__image-figure {
  margin: 30px auto;
  max-width: 800px;
  text-align: center;
  background-color: var(--deep-red-color);
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.page-khuyen-mai__content-image {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
  margin: 0 auto;
}

.page-khuyen-mai__image-caption {
  font-size: 0.9em;
  color: rgba(var(--text-main-color), 0.8);
  margin-top: 10px;
}

/* Promo Grid */
.page-khuyen-mai__promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-khuyen-mai__promo-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text-main-color);
}

.page-khuyen-mai__promo-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
}

.page-khuyen-mai__card-title {
  font-size: 1.4em;
  font-weight: 700;
  color: var(--gold-color);
  margin-bottom: 15px;
}

.page-khuyen-mai__card-text {
  font-size: 1em;
  color: var(--text-main-color);
  margin-bottom: 25px;
}

.page-khuyen-mai__btn-card {
  background: var(--button-gradient);
  color: #333333;
  border: none;
  width: 100%;
  padding: 10px 20px;
}

.page-khuyen-mai__btn-card:hover {
  filter: brightness(1.1);
}

.page-khuyen-mai__btn-inline {
  margin-top: 20px;
}

/* Step List */
.page-khuyen-mai__step-list {
  list-style: none;
  padding: 0;
  margin: 40px 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-khuyen-mai__step-item {
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: flex-start;
  gap: 20px;
  border: 1px solid var(--border-color);
  color: var(--text-main-color);
}

.page-khuyen-mai__step-number {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 45px;
  height: 45px;
  min-width: 45px;
  border-radius: 50%;
  background: var(--button-gradient);
  color: #333333; /* Dark text on gold number */
  font-size: 1.5em;
  font-weight: 700;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__step-title {
  font-size: 1.3em;
  font-weight: 700;
  color: var(--gold-color);
  margin-bottom: 10px;
}

.page-khuyen-mai__step-text {
  font-size: 1em;
  color: var(--text-main-color);
}

.page-khuyen-mai__cta-buttons--bottom {
  margin-top: 50px;
}

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

.page-khuyen-mai__faq-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 15px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  color: var(--text-main-color);
}

.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: var(--gold-color);
  cursor: pointer;
  list-style: none; /* Hide default marker for summary */
}

.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;
  color: var(--gold-color);
}

.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: 1em;
  color: var(--text-main-color);
  line-height: 1.6;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, opacity 0.4s ease-out;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-answer {
  opacity: 1;
  max-height: 500px; /* Sufficiently large for content */
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .page-khuyen-mai__main-title {
    font-size: clamp(2em, 5vw, 3em);
  }

  .page-khuyen-mai__section-title {
    font-size: 2em;
  }

  .page-khuyen-mai__promo-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .page-khuyen-mai__step-list {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

@media (max-width: 768px) {
  /* 1. 顶区标题 + 双 CTA */
  .page-khuyen-mai__hero-section {
    padding-top: 10px !important; /* Ensure small top padding */
    margin-bottom: 20px;
  }

  .page-khuyen-mai__hero-content {
    padding: 30px 15px;
  }

  .page-khuyen-mai__main-title {
    font-size: clamp(1.8em, 7vw, 2.5em);
    margin-bottom: 10px;
  }

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

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

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

  /* 2. 单栏长文容器 */
  .page-khuyen-mai__container,
  .page-khuyen-mai__section,
  .page-khuyen-mai__promo-card,
  .page-khuyen-mai__step-item,
  .page-khuyen-mai__faq-item {
    padding-left: 15px !important;
    padding-right: 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

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

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

  .page-khuyen-mai__sub-title {
    font-size: 1.4em;
    margin-top: 30px;
    margin-bottom: 15px;
  }

  .page-khuyen-mai__text-block, 
  .page-khuyen-mai__list-item, 
  .page-khuyen-mai__card-text, 
  .page-khuyen-mai__step-text, 
  .page-khuyen-mai__faq-answer p {
    font-size: 0.95em;
  }

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

  .page-khuyen-mai__promo-card {
    padding: 25px;
  }

  /* 3. 通用图片与 figure */
  .page-khuyen-mai img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-khuyen-mai__image-figure {
    padding: 5px;
    margin: 20px auto;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  /* 4. 按钮与按钮容器 (already handled in general .page-khuyen-mai__btn) */
  .page-khuyen-mai__cta-buttons--bottom {
    flex-direction: column;
    gap: 15px;
    padding: 0 15px;
  }

  /* 5. FAQ 区块 */
  .page-khuyen-mai__faq-question {
    padding: 15px 20px;
    font-size: 1.05em;
  }

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

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

  .page-khuyen-mai__step-item {
    padding: 25px;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .page-khuyen-mai__step-number {
    margin-bottom: 15px;
  }
}