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

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

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

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

.page-khuyen-mai__section-title {
    font-size: 36px;
    font-weight: bold;
    color: var(--gold-color);
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 10px;
}

.page-khuyen-mai__section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--gold-color);
    border-radius: 2px;
}

.page-khuyen-mai__text-block {
    font-size: 18px;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-main-color);
}

.page-khuyen-mai__text-link {
    color: var(--gold-color);
    text-decoration: underline;
    transition: color 0.3s ease;
}

.page-khuyen-mai__text-link:hover {
    color: var(--glow-color);
}

/* HERO Section */
.page-khuyen-mai__hero-section {
    position: relative;
    padding-top: 10px; /* Small top padding, body handles header offset */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    text-align: center;
    min-height: 500px;
    background-color: var(--deep-red-color);
}

.page-khuyen-mai__hero-image-wrapper {
    width: 100%;
    height: auto;
    max-height: 600px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page-khuyen-mai__hero-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
    aspect-ratio: 16/9;
}

.page-khuyen-mai__hero-content {
    padding: 30px 15px;
    max-width: 900px;
    z-index: 1;
    color: var(--text-main-color);
}

.page-khuyen-mai__hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 900;
    color: var(--gold-color);
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.page-khuyen-mai__hero-description {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.page-khuyen-mai__btn-primary {
    display: inline-block;
    background: var(--button-gradient);
    color: #000000; /* Dark text for gold button */
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    font-size: 18px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.page-khuyen-mai__btn-secondary {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--text-main-color);
    padding: 12px 25px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    transition: background-color 0.3s ease, transform 0.3s ease;
    border: 2px solid var(--gold-color);
    cursor: pointer;
}

.page-khuyen-mai__btn-secondary:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Intro Section */
.page-khuyen-mai__intro-section .page-khuyen-mai__text-block {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* Promotion Types Section */
.page-khuyen-mai__dark-section {
    background-color: var(--deep-red-color);
    color: var(--text-main-color);
}

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

.page-khuyen-mai__type-item {
    background-color: var(--card-bg-color);
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color-custom);
}

.page-khuyen-mai__type-title {
    font-size: 24px;
    color: var(--gold-color);
    margin-bottom: 15px;
}

.page-khuyen-mai__type-description {
    font-size: 16px;
    color: var(--text-main-color);
}

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

.page-khuyen-mai__promo-card {
    background-color: var(--card-bg-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color-custom);
}

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

.page-khuyen-mai__card-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.page-khuyen-mai__card-title {
    font-size: 20px;
    color: var(--gold-color);
    margin-bottom: 10px;
    line-height: 1.3;
}

.page-khuyen-mai__card-description {
    font-size: 15px;
    color: var(--text-main-color);
    margin-bottom: 20px;
    flex-grow: 1;
}

/* Guide Section */
.page-khuyen-mai__guide-container {
    display: flex;
    align-items: center;
    gap: 40px;
}

.page-khuyen-mai__guide-content {
    flex: 1;
}

.page-khuyen-mai__guide-image-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page-khuyen-mai__guide-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__guide-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.page-khuyen-mai__guide-list li {
    background-color: rgba(255, 255, 255, 0.1);
    margin-bottom: 10px;
    padding: 15px 20px;
    border-radius: 8px;
    font-size: 17px;
    color: var(--text-main-color);
    border-left: 5px solid var(--gold-color);
}

.page-khuyen-mai__guide-list li strong {
    color: var(--gold-color);
}

/* Terms Section */
.page-khuyen-mai__terms-container {
    display: flex;
    align-items: center;
    gap: 40px;
}

.page-khuyen-mai__terms-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    flex: 1;
}

.page-khuyen-mai__terms-content {
    flex: 1;
}

.page-khuyen-mai__terms-content .page-khuyen-mai__text-block {
    text-align: left;
}

/* Benefits Section */
.page-khuyen-mai__benefits-list {
    list-style: none;
    padding: 0;
    margin-top: 30px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.page-khuyen-mai__benefits-list li {
    background-color: var(--card-bg-color);
    margin-bottom: 15px;
    padding: 18px 25px;
    border-radius: 8px;
    font-size: 17px;
    color: var(--text-main-color);
    border-left: 5px solid var(--gold-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.page-khuyen-mai__benefits-list li strong {
    color: var(--gold-color);
}

/* FAQ Section */
details.page-khuyen-mai__faq-item {
    margin-bottom: 15px;
    border-radius: 5px;
    border: 1px solid var(--border-color-custom);
    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;
}

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(--deep-red-color);
}

.page-khuyen-mai__faq-qtext {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    text-align: left;
    color: var(--gold-color);
}

.page-khuyen-mai__faq-toggle {
    font-size: 24px;
    font-weight: bold;
    color: var(--gold-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: var(--deep-red-color);
    border-radius: 0 0 5px 5px;
    color: var(--text-main-color);
}

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

/* Conclusion CTA Section */
.page-khuyen-mai__conclusion-cta {
    text-align: center;
    padding: 60px 0;
    background-color: var(--deep-red-color);
}

.page-khuyen-mai__conclusion-cta .page-khuyen-mai__section-title {
    color: var(--gold-color);
}

.page-khuyen-mai__conclusion-cta .page-khuyen-mai__text-block {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 30px;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .page-khuyen-mai__hero-title {
        font-size: clamp(2rem, 4.5vw, 4rem);
    }
    .page-khuyen-mai__hero-description {
        font-size: clamp(1rem, 1.8vw, 1.3rem);
    }
    .page-khuyen-mai__section-title {
        font-size: 32px;
    }
    .page-khuyen-mai__type-grid,
    .page-khuyen-mai__promotion-grid {
        gap: 20px;
    }
    .page-khuyen-mai__guide-container,
    .page-khuyen-mai__terms-container {
        flex-direction: column;
        text-align: center;
    }
    .page-khuyen-mai__guide-image-wrapper, .page-khuyen-mai__terms-image {
        order: -1; /* Image above text on smaller screens */
        margin-bottom: 20px;
    }
    .page-khuyen-mai__terms-content .page-khuyen-mai__text-block {
        text-align: center;
    }
}

@media (max-width: 768px) {
    /* HERO Section */
    .page-khuyen-mai__hero-section {
        padding-top: 10px; /* Small top padding, body handles header offset */
        min-height: 400px;
    }
    .page-khuyen-mai__hero-image {
        object-fit: contain !important;
        aspect-ratio: unset !important;
        max-height: 300px;
    }
    .page-khuyen-mai__hero-title {
        font-size: clamp(1.8rem, 8vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__hero-description {
        font-size: clamp(0.9rem, 3.5vw, 1.1rem);
        margin-bottom: 20px;
    }
    .page-khuyen-mai__btn-primary {
        padding: 12px 25px;
        font-size: 16px;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        white-space: normal !important;
        word-wrap: break-word !important;
    }

    /* General Sections */
    .page-khuyen-mai__section {
        padding: 30px 0;
    }
    .page-khuyen-mai__container {
        padding: 0 15px;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__section-title {
        font-size: 28px;
        margin-bottom: 30px;
    }
    .page-khuyen-mai__text-block {
        font-size: 16px;
    }

    /* Promotion Types Section */
    .page-khuyen-mai__type-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-khuyen-mai__type-title {
        font-size: 20px;
    }

    /* Featured Promotions Section */
    .page-khuyen-mai__promotion-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-khuyen-mai__promo-card {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__card-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-khuyen-mai__card-title {
        font-size: 18px;
    }
    .page-khuyen-mai__card-description {
        font-size: 14px;
    }
    .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: 10px 15px;
        font-size: 15px;
    }

    /* Guide Section */
    .page-khuyen-mai__guide-container {
        flex-direction: column;
        gap: 20px;
    }
    .page-khuyen-mai__guide-list li {
        font-size: 15px;
        padding: 12px 15px;
    }
    .page-khuyen-mai__guide-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    /* Terms Section */
    .page-khuyen-mai__terms-container {
        flex-direction: column;
        gap: 20px;
    }
    .page-khuyen-mai__terms-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    /* Benefits Section */
    .page-khuyen-mai__benefits-list li {
        font-size: 15px;
        padding: 15px 20px;
    }

    /* 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; }

    /* Conclusion CTA Section */
    .page-khuyen-mai__conclusion-cta {
        padding: 40px 0;
    }
    .page-khuyen-mai__conclusion-cta .page-khuyen-mai__text-block {
        margin-bottom: 20px;
    }

    /* Ensure all images and containers are responsive */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        display: block;
    }
    .page-khuyen-mai__section,
    .page-khuyen-mai__card,
    .page-khuyen-mai__container,
    .page-khuyen-mai__hero-content,
    .page-khuyen-mai__guide-content,
    .page-khuyen-mai__terms-content,
    .page-khuyen-mai__type-item,
    .page-khuyen-mai__promo-card,
    .page-khuyen-mai__benefits-list li,
    .page-khuyen-mai__faq-item {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    /* Remove explicit padding-left/right for elements that already have it from parent container */
    .page-khuyen-mai__hero-content,
    .page-khuyen-mai__guide-content,
    .page-khuyen-mai__terms-content {
        padding-left: 0;
        padding-right: 0;
    }
    .page-khuyen-mai__card-content {
        padding: 15px;
    }
    .page-khuyen-mai__type-item {
        padding: 20px;
    }
}