:root {
    --primary-color: #FF8C1A;
    --secondary-color: #FFA53A;
    --card-bg-color: #17191F;
    --background-color: #0D0E12;
    --text-main-color: #FFF3E6;
    --border-color: #A84F0C;
    --glow-color: #FFB04D;
    --deep-orange-color: #D96800;
    --button-gradient: linear-gradient(180deg, #FFA53A 0%, #D96800 100%);
}

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

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

.page-khuyen-mai__hero-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 10px; /* Small top padding, body handles header offset */
    background-color: var(--background-color);
    overflow: hidden;
}

.page-khuyen-mai__hero-image-wrapper {
    width: 100%;
    max-height: 675px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.page-khuyen-mai__hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 40px 15px;
    max-width: 900px;
    margin-top: -80px; /* Overlap slightly for visual flow, but not text on image */
    background-color: rgba(23, 25, 31, 0.9); /* Card BG with transparency */
    border-radius: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}

.page-khuyen-mai__main-title {
    font-size: clamp(28px, 4vw, 48px); /* Use clamp for H1 */
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: 0.5px;
}

.page-khuyen-mai__hero-description {
    font-size: 18px;
    margin-bottom: 30px;
    color: var(--text-main-color);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary,
.page-khuyen-mai__card-button,
.page-khuyen-mai a[class*="button"],
.page-khuyen-mai a[class*="btn"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: normal;
    word-wrap: break-word;
    text-align: center;
    max-width: 100%;
    box-sizing: border-box;
}

.page-khuyen-mai__btn-primary {
    background: var(--button-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 15px rgba(255, 132, 26, 0.4);
}

.page-khuyen-mai__btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 132, 26, 0.6);
}

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

.page-khuyen-mai__btn-secondary:hover {
    background: rgba(255, 165, 58, 0.1);
    color: #ffffff;
}

.page-khuyen-mai__section-title {
    font-size: clamp(24px, 3.5vw, 40px);
    font-weight: 700;
    color: var(--secondary-color);
    text-align: center;
    margin-bottom: 30px;
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.page-khuyen-mai__text-block {
    font-size: 17px;
    margin-bottom: 20px;
    color: var(--text-main-color);
    text-align: justify;
}

.page-khuyen-mai__highlight {
    color: var(--primary-color);
    font-weight: 700;
}

.page-khuyen-mai__intro-section,
.page-khuyen-mai__how-to-claim,
.page-khuyen-mai__why-choose,
.page-khuyen-mai__faq-section {
    background-color: #12141a; /* Slightly lighter dark background for contrast */
    padding: 60px 0;
    color: var(--text-main-color);
}

.page-khuyen-mai__promo-categories,
.page-khuyen-mai__terms-section,
.page-khuyen-mai__cta-section {
    background-color: var(--background-color);
    padding: 60px 0;
    color: var(--text-main-color);
}

.page-khuyen-mai__promo-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    padding-bottom: 20px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.page-khuyen-mai__promo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(255, 132, 26, 0.2);
}

.page-khuyen-mai__card-image {
    width: 100%;
    height: 250px; /* Fixed height for consistency */
    object-fit: cover;
    display: block;
    margin-bottom: 15px;
}

.page-khuyen-mai__card-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--secondary-color);
    margin: 15px 15px 10px;
    flex-grow: 1;
}

.page-khuyen-mai__card-description {
    font-size: 15px;
    color: #ccc;
    margin: 0 15px 20px;
    flex-grow: 1;
}

.page-khuyen-mai__card-button {
    background: var(--button-gradient);
    color: #ffffff;
    border: none;
    margin: 0 15px;
    padding: 10px 20px;
    font-size: 15px;
}

.page-khuyen-mai__card-button:hover {
    transform: translateY(-1px);
}

.page-khuyen-mai__category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.page-khuyen-mai__steps-list {
    list-style: none;
    padding: 0;
    margin: 40px 0 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.page-khuyen-mai__step-item {
    display: flex;
    align-items: flex-start;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__step-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-right: 20px;
    flex-shrink: 0;
    line-height: 1;
}

.page-khuyen-mai__step-content {
    flex-grow: 1;
}

.page-khuyen-mai__step-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 10px;
}

.page-khuyen-mai__step-content p {
    font-size: 16px;
    color: var(--text-main-color);
    margin-bottom: 0;
}

.page-khuyen-mai__step-content p a {
    color: var(--secondary-color);
    text-decoration: underline;
}

.page-khuyen-mai__terms-list,
.page-khuyen-mai__benefits-list {
    list-style: none;
    padding-left: 0;
    margin-top: 30px;
    margin-bottom: 30px;
}

.page-khuyen-mai__terms-list li,
.page-khuyen-mai__benefits-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    font-size: 16px;
    color: var(--text-main-color);
}

.page-khuyen-mai__terms-list li::before,
.page-khuyen-mai__benefits-list li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: 1.2em;
    line-height: 1;
}

.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(--card-bg-color);
}
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;
  color: var(--secondary-color);
  font-weight: 600;
}
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: rgba(255, 165, 58, 0.05);
}
.page-khuyen-mai__faq-qtext {
  flex: 1;
  font-size: 16px;
  line-height: 1.5;
  text-align: left;
}
.page-khuyen-mai__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  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: #12141a; /* Slightly lighter for answer background */
  border-radius: 0 0 5px 5px;
  color: var(--text-main-color);
}

.page-khuyen-mai__faq-answer p {
    margin: 0;
    font-size: 15px;
}

.page-khuyen-mai__faq-answer a {
    color: var(--secondary-color);
    text-decoration: underline;
}

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

/* Mobile responsiveness */
@media (max-width: 1024px) {
    .page-khuyen-mai__hero-content {
        margin-top: -60px;
        padding: 30px 15px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(26px, 3.8vw, 44px);
    }
    .page-khuyen-mai__hero-description {
        font-size: 17px;
    }
    .page-khuyen-mai__section-title {
        font-size: clamp(22px, 3.2vw, 36px);
    }
    .page-khuyen-mai__text-block {
        font-size: 16px;
    }
    .page-khuyen-mai__promo-card {
        padding-bottom: 15px;
    }
    .page-khuyen-mai__card-image {
        height: 200px;
    }
    .page-khuyen-mai__card-title {
        font-size: 20px;
    }
    .page-khuyen-mai__card-description {
        font-size: 14px;
    }
    .page-khuyen-mai__card-button {
        padding: 9px 18px;
        font-size: 14px;
    }
    .page-khuyen-mai__step-number {
        font-size: 32px;
    }
    .page-khuyen-mai__step-title {
        font-size: 22px;
    }
    .page-khuyen-mai__faq-qtext {
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    /* 1. Top section padding */
    .page-khuyen-mai__hero-section {
        padding-top: 10px; /* Small top padding, body handles header offset */
    }

    /* 2. Layouts for multi-column sections to single column */
    .page-khuyen-mai__hero-content {
        margin-top: -40px;
        padding: 25px 15px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(24px, 6vw, 36px);
    }
    .page-khuyen-mai__hero-description {
        font-size: 16px;
    }
    .page-khuyen-mai__hero-cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    .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-left: 15px;
        padding-right: 15px;
    }
    .page-khuyen-mai__promo-categories .page-khuyen-mai__container {
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-khuyen-mai__category-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-khuyen-mai__promo-card {
        padding-bottom: 10px;
    }
    .page-khuyen-mai__card-image {
        height: 180px;
    }
    .page-khuyen-mai__card-title {
        font-size: 18px;
        margin: 10px 10px 8px;
    }
    .page-khuyen-mai__card-description {
        font-size: 14px;
        margin: 0 10px 15px;
    }
    .page-khuyen-mai__card-button {
        padding: 8px 15px;
        font-size: 14px;
        margin: 0 10px;
    }
    .page-khuyen-mai__steps-list {
        gap: 20px;
    }
    .page-khuyen-mai__step-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 20px;
    }
    .page-khuyen-mai__step-number {
        margin-right: 0;
        margin-bottom: 15px;
    }
    .page-khuyen-mai__step-title {
        font-size: 20px;
    }
    .page-khuyen-mai__faq-section .page-khuyen-mai__container {
        padding-left: 15px;
        padding-right: 15px;
    }

    /* 3. General image and container responsiveness */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-khuyen-mai__container,
    .page-khuyen-mai__hero-image-wrapper,
    .page-khuyen-mai__hero-content,
    .page-khuyen-mai__promo-card,
    .page-khuyen-mai__step-item,
    .page-khuyen-mai__faq-item {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-khuyen-mai__hero-image-wrapper,
    .page-khuyen-mai__hero-content {
        padding-left: 0;
        padding-right: 0;
    }

    /* 4. Buttons: Handled above with general button styles */

    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__cta-buttons,
    .page-khuyen-mai__hero-cta-buttons {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden;
        flex-wrap: wrap !important;
        gap: 10px;
        flex-direction: column;
    }
}