:root {
    --f66-primary-color: #FF8C1A;
    --f66-secondary-color: #FFA53A;
    --f66-card-bg: #17191F;
    --f66-background: #0D0E12;
    --f66-text-main: #FFF3E6;
    --f66-border-color: #A84F0C;
    --f66-glow-color: #FFB04D;
    --f66-deep-orange: #D96800;
}

.page-khuyen-mai {
    background-color: var(--f66-background);
    color: var(--f66-text-main);
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
}

/* HERO Section */
.page-khuyen-mai__hero-section {
    padding-top: 10px; /* Small top padding, relying on shared for body padding */
    padding-bottom: 60px;
    background-color: var(--f66-background);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.page-khuyen-mai__hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    padding: 20px 15px;
}

.page-khuyen-mai__hero-content {
    flex: 1 1 45%;
    min-width: 300px;
    text-align: left;
}

.page-khuyen-mai__hero-title {
    font-size: clamp(2.2rem, 4vw, 3.5rem); /* Using clamp for H1 */
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--f66-text-main);
}

.page-khuyen-mai__hero-description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: var(--f66-text-main);
}

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

.page-khuyen-mai__hero-image {
    flex: 1 1 45%;
    min-width: 300px;
    text-align: center;
}

.page-khuyen-mai__hero-side-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(255, 140, 26, 0.4); /* Glow effect */
    display: block;
}

/* General Section Styling */
.page-khuyen-mai__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 15px;
}

.page-khuyen-mai__section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: var(--f66-primary-color);
    text-shadow: 0 0 8px rgba(255, 176, 77, 0.5); /* Glow */
}

.page-khuyen-mai__section-description {
    font-size: 1rem;
    text-align: center;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: var(--f66-text-main);
}

/* Buttons */
.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary,
.page-khuyen-mai__btn-text {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    text-align: center;
}

.page-khuyen-mai__btn-primary {
    background: linear-gradient(180deg, var(--f66-secondary-color) 0%, var(--f66-deep-orange) 100%);
    color: var(--f66-text-main);
    border: none;
    box-shadow: 0 4px 15px rgba(255, 140, 26, 0.4);
}

.page-khuyen-mai__btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 140, 26, 0.6);
}

.page-khuyen-mai__btn-secondary {
    background-color: transparent;
    color: var(--f66-primary-color);
    border: 2px solid var(--f66-primary-color);
    box-shadow: 0 4px 10px rgba(255, 140, 26, 0.2);
}

.page-khuyen-mai__btn-secondary:hover {
    background-color: var(--f66-primary-color);
    color: var(--f66-text-main);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(255, 140, 26, 0.4);
}

.page-khuyen-mai__btn-text {
    color: var(--f66-primary-color);
    background: none;
    border: none;
    padding: 0;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: underline;
}

.page-khuyen-mai__btn-text:hover {
    color: var(--f66-secondary-color);
}

/* Intro Section */
.page-khuyen-mai__intro-section {
    background-color: var(--f66-card-bg);
    padding: 60px 0;
}

/* Promo Types Section */
.page-khuyen-mai__promo-types-section {
    padding: 60px 0;
}

.page-khuyen-mai__promo-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(--f66-card-bg);
    border: 1px solid var(--f66-border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-khuyen-mai__promo-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(255, 140, 26, 0.3);
}

.page-khuyen-mai__icon-box-media {
    width: 200px; /* Fixed width for circular image */
    height: 200px; /* Fixed height for circular image */
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--f66-primary-color);
    box-shadow: 0 0 15px rgba(255, 176, 77, 0.6);
}

.page-khuyen-mai__icon-box-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    display: block;
}

.page-khuyen-mai__card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--f66-primary-color);
}

.page-khuyen-mai__card-description {
    font-size: 0.95rem;
    margin-bottom: 20px;
    color: var(--f66-text-main);
}

/* Guide Section */
.page-khuyen-mai__guide-section {
    padding: 60px 0;
    background-color: var(--f66-background);
}

.page-khuyen-mai__guide-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
    margin-top: 40px;
}

.page-khuyen-mai__guide-steps {
    flex: 1 1 55%;
    min-width: 300px;
}

.page-khuyen-mai__guide-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.page-khuyen-mai__guide-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--f66-primary-color);
    line-height: 1;
    flex-shrink: 0;
}

.page-khuyen-mai__guide-heading {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 5px;
    color: var(--f66-primary-color);
}

.page-khuyen-mai__guide-text {
    font-size: 0.95rem;
    color: var(--f66-text-main);
    margin-top: 5px;
}

.page-khuyen-mai__guide-image {
    flex: 1 1 35%;
    min-width: 300px;
    text-align: center;
}

.page-khuyen-mai__guide-illustration {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(255, 140, 26, 0.4);
    display: block;
}

.page-khuyen-mai__cta-wrapper {
    text-align: center;
    margin-top: 50px;
}

/* Terms Section */
.page-khuyen-mai__terms-section {
    padding: 60px 0;
    background-color: var(--f66-card-bg);
}

.page-khuyen-mai__terms-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
    margin-top: 40px;
}

.page-khuyen-mai__terms-list {
    flex: 1 1 55%;
    min-width: 300px;
    list-style: none;
    padding: 0;
}

.page-khuyen-mai__terms-item {
    font-size: 1rem;
    color: var(--f66-text-main);
    margin-bottom: 15px;
    position: relative;
    padding-left: 25px;
}

.page-khuyen-mai__terms-item::before {
    content: '✔';
    color: var(--f66-primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.page-khuyen-mai__terms-image {
    flex: 1 1 35%;
    min-width: 300px;
    text-align: center;
}

.page-khuyen-mai__terms-illustration {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(255, 140, 26, 0.4);
    display: block;
}

/* Why Choose Section */
.page-khuyen-mai__why-choose-section {
    padding: 60px 0;
    background-color: var(--f66-background);
}

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

.page-khuyen-mai__reason-card {
    background-color: var(--f66-card-bg);
    border: 1px solid var(--f66-border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.page-khuyen-mai__reason-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--f66-primary-color);
}

.page-khuyen-mai__reason-description {
    font-size: 0.95rem;
    color: var(--f66-text-main);
}

/* FAQ Section */
.page-khuyen-mai__faq-section {
    padding: 60px 0;
    background-color: var(--f66-card-bg);
}

.page-khuyen-mai__faq-list {
    max-width: 900px;
    margin: 40px auto 0;
}

.page-khuyen-mai__faq-item {
    background-color: var(--f66-background);
    border: 1px solid var(--f66-border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--f66-primary-color);
    cursor: pointer;
    background-color: var(--f66-background);
    user-select: none;
    list-style: none; /* For details/summary */
}

.page-khuyen-mai__faq-question::-webkit-details-marker {
    display: none; /* Hide default marker */
}

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

.page-khuyen-mai__faq-toggle {
    font-size: 1.8rem;
    line-height: 1;
    margin-left: 15px;
    color: var(--f66-secondary-color);
    transition: transform 0.3s ease;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-toggle {
    transform: rotate(45deg); /* Rotate '+' to 'x' or similar */
}

.page-khuyen-mai__faq-answer {
    padding: 0 25px 20px;
    font-size: 1rem;
    color: var(--f66-text-main);
    line-height: 1.6;
}

.page-khuyen-mai__faq-answer p {
    margin-bottom: 10px;
}

.page-khuyen-mai__faq-answer a {
    color: var(--f66-primary-color);
    text-decoration: underline;
}

.page-khuyen-mai__faq-answer a:hover {
    color: var(--f66-secondary-color);
}

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

.page-khuyen-mai__section,
.page-khuyen-mai__card,
.page-khuyen-mai__container,
.page-khuyen-mai__promo-card,
.page-khuyen-mai__reason-card {
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
    overflow: hidden; /* Ensure content doesn't overflow */
}

/* Media Queries for Mobile (max-width: 768px) */
@media (max-width: 768px) {
    /* HERO Section */
    .page-khuyen-mai__hero-section {
        padding-top: 10px !important; /* Ensure small padding, not header-offset */
        padding-bottom: 40px;
    }
    .page-khuyen-mai__hero-container {
        flex-direction: column;
        text-align: center;
        padding: 20px 15px;
    }
    .page-khuyen-mai__hero-content {
        text-align: center;
        flex: 1 1 100%;
    }
    .page-khuyen-mai__hero-title {
        font-size: clamp(2rem, 8vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__hero-description {
        font-size: 1rem;
        margin-bottom: 25px;
    }
    .page-khuyen-mai__hero-cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    .page-khuyen-mai__btn-primary,
    .page-khuyen-mai__btn-secondary {
        max-width: 100% !important;
        width: 100% !important;
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    .page-khuyen-mai__hero-image {
        flex: 1 1 100%;
        margin-top: 30px;
    }
    .page-khuyen-mai__hero-side-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    /* General Section Titles and Descriptions */
    .page-khuyen-mai__section-title {
        font-size: clamp(1.6rem, 7vw, 2.2rem);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__section-description {
        font-size: 0.9rem;
        margin-bottom: 30px;
    }
    .page-khuyen-mai__container {
        padding: 30px 15px;
    }

    /* Promo Types Section (Module 1 circular images) */
    .page-khuyen-mai__promo-grid {
        grid-template-columns: 1fr; /* Single column */
        gap: 20px;
    }
    .page-khuyen-mai__promo-card {
        padding: 25px;
    }
    .page-khuyen-mai__icon-box-media {
        width: 180px; /* Keep circular for mobile */
        height: 180px;
        margin-bottom: 15px;
    }
    .page-khuyen-mai__icon-box-media img {
        width: 100% !important;
        height: 100% !important;
    }
    .page-khuyen-mai__card-title {
        font-size: 1.3rem;
    }
    .page-khuyen-mai__card-description {
        font-size: 0.9rem;
    }

    /* Guide Section */
    .page-khuyen-mai__guide-content {
        flex-direction: column-reverse; /* Image above steps on mobile */
        gap: 30px;
    }
    .page-khuyen-mai__guide-steps {
        flex: 1 1 100%;
    }
    .page-khuyen-mai__guide-item {
        gap: 15px;
        margin-bottom: 25px;
    }
    .page-khuyen-mai__guide-number {
        font-size: 2rem;
    }
    .page-khuyen-mai__guide-heading {
        font-size: 1.2rem;
    }
    .page-khuyen-mai__guide-text {
        font-size: 0.9rem;
    }
    .page-khuyen-mai__guide-image {
        flex: 1 1 100%;
    }
    .page-khuyen-mai__guide-illustration {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-khuyen-mai__cta-wrapper {
        margin-top: 40px;
    }

    /* Terms Section */
    .page-khuyen-mai__terms-content {
        flex-direction: column;
        gap: 30px;
    }
    .page-khuyen-mai__terms-list,
    .page-khuyen-mai__terms-image {
        flex: 1 1 100%;
    }
    .page-khuyen-mai__terms-item {
        font-size: 0.95rem;
        padding-left: 20px;
    }
    .page-khuyen-mai__terms-illustration {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    /* Why Choose Section */
    .page-khuyen-mai__why-choose-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-khuyen-mai__reason-card {
        padding: 25px;
    }
    .page-khuyen-mai__reason-title {
        font-size: 1.3rem;
    }
    .page-khuyen-mai__reason-description {
        font-size: 0.9rem;
    }

    /* FAQ Section */
    .page-khuyen-mai__faq-list {
        margin-top: 30px;
    }
    .page-khuyen-mai__faq-question {
        padding: 15px 20px;
        font-size: 1rem;
    }
    .page-khuyen-mai__faq-toggle {
        font-size: 1.5rem;
    }
    .page-khuyen-mai__faq-answer {
        padding: 0 20px 15px;
        font-size: 0.9rem;
    }

    /* Universal image and container sizing for mobile */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
    .page-khuyen-mai__section,
    .page-khuyen-mai__card,
    .page-khuyen-mai__container,
    .page-khuyen-mai__promo-card,
    .page-khuyen-mai__reason-card {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
    .page-khuyen-mai__hero-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;
    }
    .page-khuyen-mai__hero-cta-buttons {
        flex-direction: column;
    }
}