:root {
    --primary-color: #26A9E0;
    --secondary-color: #FFFFFF;
    --text-color-dark: #333333;
    --text-color-light: #FFFFFF;
    --bg-light: #f9f9f9;
    --bg-white: #FFFFFF;
    --border-color: #e0e0e0;
    --button-login-color: #EA7C07;
}

/* Base styles for the page content */
.page-khuyen-mai {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color-dark);
}

.page-khuyen-mai__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 15px;
}

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

.page-khuyen-mai__light-bg {
    background-color: var(--bg-white);
    color: var(--text-color-dark);
}

.page-khuyen-mai__dark-bg {
    background-color: var(--primary-color);
    color: var(--text-color-light);
}

.page-khuyen-mai__section-title {
    font-size: clamp(24px, 4vw, 36px);
    font-weight: 700;
    margin-bottom: 20px;
    color: inherit; /* Inherit from parent section for contrast */
    text-align: center;
}

.page-khuyen-mai__section-description {
    font-size: 18px;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto 40px;
    text-align: center;
}

/* Hero Section */
.page-khuyen-mai__hero-section {
    position: relative;
    padding-top: 10px; /* Small top padding, assuming body handles header offset */
    margin-bottom: 40px;
    overflow: hidden;
}

.page-khuyen-mai__hero-image {
    position: relative;
    width: 100%;
    height: 600px; /* Fixed height for desktop */
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    margin-bottom: 20px;
}

.page-khuyen-mai__hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Cover for desktop */
    display: block;
}

.page-khuyen-mai__hero-content {
    text-align: center;
    padding: 20px 15px;
    max-width: 900px;
    margin: 0 auto;
}

.page-khuyen-mai__main-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--primary-color);
    line-height: 1.2;
}

.page-khuyen-mai__hero-description {
    font-size: clamp(16px, 2.5vw, 20px);
    margin-bottom: 30px;
    color: var(--text-color-dark);
}

/* CTA Buttons */
.page-khuyen-mai__cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.page-khuyen-mai__cta-buttons--center {
    justify-content: center;
}

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 30px;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    max-width: 100%; /* Ensure responsiveness */
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    text-align: center;
}

.page-khuyen-mai__btn-primary {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    border-color: var(--primary-color);
}

.page-khuyen-mai__btn-primary:hover {
    background-color: #1a8cc4; /* Darker shade of #26A9E0 */
    border-color: #1a8cc4;
}

.page-khuyen-mai__btn-secondary {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.page-khuyen-mai__btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

/* Promo Grid Section */
.page-khuyen-mai__overview-section {
    padding: 60px 0;
}

.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(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    color: var(--text-color-dark); /* Ensure text is dark on light card */
}

.page-khuyen-mai__promo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.page-khuyen-mai__promo-card img {
    width: 100%;
    height: 250px; /* Fixed height for card images */
    object-fit: cover;
    display: block;
    min-width: 200px; /* Min size requirement */
    min-height: 200px; /* Min size requirement */
}

.page-khuyen-mai__card-title {
    font-size: 20px;
    font-weight: 700;
    margin: 20px 20px 10px;
    line-height: 1.4;
}

.page-khuyen-mai__card-title a {
    color: var(--primary-color);
    text-decoration: none;
}

.page-khuyen-mai__card-title a:hover {
    text-decoration: underline;
}

.page-khuyen-mai__card-text {
    font-size: 15px;
    color: #555;
    padding: 0 20px;
    flex-grow: 1;
}

.page-khuyen-mai__card-button {
    display: block;
    text-align: center;
    padding: 12px 20px;
    margin: 20px;
    background-color: var(--primary-color);
    color: var(--text-color-light);
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
    max-width: calc(100% - 40px); /* Adjust for padding */
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
}

.page-khuyen-mai__card-button:hover {
    background-color: #1a8cc4; /* Darker shade of #26A9E0 */
}

/* Content Area */
.page-khuyen-mai__content-area {
    padding: 60px 0;
}

.page-khuyen-mai__article-body {
    max-width: 900px;
    margin: 40px auto 0;
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    color: var(--text-color-dark);
}

.page-khuyen-mai__article-body p {
    margin-bottom: 1em;
    font-size: 16px;
    line-height: 1.7;
}

.page-khuyen-mai__article-subtitle {
    font-size: 24px;
    font-weight: 700;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.page-khuyen-mai__article-figure {
    margin: 30px 0;
    text-align: center;
}

.page-khuyen-mai__article-figure img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: block;
    margin: 0 auto;
    min-width: 200px; /* Min size requirement */
    min-height: 200px; /* Min size requirement */
}

.page-khuyen-mai__article-figure figcaption {
    font-style: italic;
    font-size: 14px;
    color: #777;
    margin-top: 10px;
}

.page-khuyen-mai__article-body ul {
    list-style-type: disc;
    margin-left: 25px;
    margin-bottom: 1em;
    font-size: 16px;
}

.page-khuyen-mai__article-body ul li {
    margin-bottom: 0.5em;
}

/* FAQ Section */
.page-khuyen-mai__faq-section {
    padding: 60px 0;
}

.page-khuyen-mai__faq-list {
    margin-top: 40px;
}

details.page-khuyen-mai__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--bg-white);
  color: var(--text-color-dark);
}
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: var(--bg-light);
}
.page-khuyen-mai__faq-qtext {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--primary-color);
}
.page-khuyen-mai__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: #666;
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}
details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer {
  padding: 0 20px 20px;
  background: var(--bg-light);
  border-radius: 0 0 5px 5px;
}
details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer p {
    margin-bottom: 0;
}

/* Call to Action Section */
.page-khuyen-mai__call-to-action {
    padding: 60px 0;
    text-align: center;
}

/* Global image responsiveness */
.page-khuyen-mai img {
    max-width: 100%;
    height: auto;
    display: block;
    object-fit: cover; /* Default for all images unless specifically overridden */
}

/* --- Responsive Styles --- */

/* For screens smaller than 1024px (tablet landscape and smaller) */
@media (max-width: 1024px) {
    .page-khuyen-mai__hero-image {
        height: 500px;
    }
    .page-khuyen-mai__overview-section,
    .page-khuyen-mai__content-area,
    .page-khuyen-mai__faq-section,
    .page-khuyen-mai__call-to-action {
        padding: 40px 0;
    }
    .page-khuyen-mai__promo-grid {
        gap: 20px;
    }
    .page-khuyen-mai__promo-card img {
        height: 220px;
    }
    .page-khuyen-mai__article-body {
        padding: 30px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(28px, 4.5vw, 42px);
    }
    .page-khuyen-mai__hero-description {
        font-size: clamp(15px, 2.2vw, 18px);
    }
}

/* For screens smaller than 849px (important for hero object-fit) */
@media (max-width: 849px) {
    .page-khuyen-mai__hero-image img {
        object-fit: contain !important; /* Prevent cropping on smaller screens */
        aspect-ratio: unset !important; /* Allow natural aspect ratio */
    }
}

/* For screens smaller than 768px (mobile) */
@media (max-width: 768px) {
    /* HERO 主图区域 */
    .page-khuyen-mai__hero-section {
        padding-top: 10px; /* Small top padding, not var(--header-offset) */
        margin-bottom: 30px;
    }
    .page-khuyen-mai__hero-image {
        height: 300px;
        margin-bottom: 15px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(26px, 7vw, 36px);
        margin-bottom: 10px;
    }
    .page-khuyen-mai__hero-description {
        font-size: clamp(14px, 3.5vw, 16px);
        margin-bottom: 20px;
    }
    .page-khuyen-mai__cta-buttons {
        flex-direction: column; /* Stack buttons vertically */
        gap: 15px;
        width: 100%; /* Ensure container takes full width */
        max-width: 100%;
        box-sizing: border-box;
        padding: 0 15px; /* Add padding to container */
    }
    /* 按钮与按钮容器 */
    .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: 12px 15px;
        font-size: 16px;
    }
    .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;
    }

    /* 产品展示图区域 / Promo Grid */
    .page-khuyen-mai__overview-section,
    .page-khuyen-mai__content-area,
    .page-khuyen-mai__faq-section,
    .page-khuyen-mai__call-to-action {
        padding: 30px 0;
    }
    .page-khuyen-mai__container {
        padding: 0 15px;
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    .page-khuyen-mai__promo-grid {
        grid-template-columns: 1fr; /* Single column for mobile */
        gap: 20px;
        overflow-x: hidden; /* Prevent horizontal scroll */
    }
    .page-khuyen-mai__promo-card {
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    .page-khuyen-mai__promo-card img {
        height: 200px;
        min-width: unset;
        min-height: unset;
    }
    .page-khuyen-mai__card-title {
        font-size: 18px;
        margin: 15px 15px 8px;
    }
    .page-khuyen-mai__card-text {
        font-size: 14px;
        padding: 0 15px;
    }
    .page-khuyen-mai__card-button {
        margin: 15px;
        max-width: calc(100% - 30px);
    }

    /* 装饰主标题 + 长文 SEO 区 */
    .page-khuyen-mai__section-title {
        font-size: clamp(22px, 6vw, 28px);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__section-description {
        font-size: 15px;
        margin-bottom: 25px;
        max-width: 100%;
        padding: 0 10px;
    }
    .page-khuyen-mai__article-body {
        padding: 20px;
        margin-top: 20px;
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    .page-khuyen-mai__article-body p,
    .page-khuyen-mai__article-body ul {
        font-size: 15px;
        line-height: 1.6;
    }
    .page-khuyen-mai__article-subtitle {
        font-size: 20px;
        margin-top: 25px;
        margin-bottom: 10px;
    }
    .page-khuyen-mai__article-figure {
        margin: 20px 0;
    }
    .page-khuyen-mai__article-figure img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        min-width: unset;
        min-height: unset;
    }
    .page-khuyen-mai__article-figure figcaption {
        font-size: 13px;
    }

    /* 通用图片与容器 */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        box-sizing: border-box;
    }
    .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;
    }

    /* FAQ Section */
    details.page-khuyen-mai__faq-item summary.page-khuyen-mai__faq-question { padding: 15px; }
    .page-khuyen-mai__faq-qtext { font-size: 15px; }
    details.page-khuyen-mai__faq-item .page-khuyen-mai__faq-answer { padding: 0 15px 15px; }
    .page-khuyen-mai__faq-toggle {
        font-size: 20px;
        width: 24px;
        margin-left: 10px;
    }
}