:root {
    --color-primary: #113B7A;
    --color-secondary: #1D5FD1;
    --color-button-gradient-top: #2B73F6;
    --color-button-gradient-bottom: #1144A6;
    --color-card-bg: #10233F;
    --color-text-main: #F3F8FF;
    --color-text-secondary: #AFC4E8;
    --color-border: #244D84;
    --color-glow: #4FA8FF;
    --color-gold: #F2C14E;
    --color-divider: #1B3357;
    --color-deep-navy: #08162B; /* Body background color */
}

.page-khuyen-mai {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text-main); /* Light text for dark body background */
    background-color: transparent; /* Body background is handled by shared.css */
}

/* Hero Section */
.page-khuyen-mai__hero-section {
    padding-top: 10px; /* Small top padding, not --header-offset */
    padding-bottom: 60px;
    background-color: var(--color-deep-navy); /* Dark background for hero section */
    color: var(--color-text-main);
}

.page-khuyen-mai__hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    padding: 20px 16px;
}

.page-khuyen-mai__hero-content {
    flex: 1 1 50%;
    min-width: 300px;
}

.page-khuyen-mai__main-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem); /* Responsive font size */
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--color-gold); /* Using gold for main title for prominence */
}

.page-khuyen-mai__description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: var(--color-text-secondary);
}

.page-khuyen-mai__cta-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    white-space: normal; /* Allow text wrapping */
    word-wrap: break-word; /* Allow text wrapping */
    box-sizing: border-box;
    max-width: 100%;
}

.page-khuyen-mai__btn-primary {
    background: linear-gradient(180deg, var(--color-button-gradient-top) 0%, var(--color-button-gradient-bottom) 100%);
    color: var(--color-text-main);
    border: 2px solid transparent;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

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

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

.page-khuyen-mai__hero-image {
    flex: 1 1 40%;
    text-align: center;
    min-width: 300px;
}

.page-khuyen-mai__hero-side-image {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

/* General Section Styles */
.page-khuyen-mai__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 16px;
    box-sizing: border-box;
}

.page-khuyen-mai__section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: var(--color-gold);
}

.page-khuyen-mai__section-description {
    font-size: 1.1rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
    color: var(--color-text-secondary);
}

/* Promo Grid Section */
.page-khuyen-mai__promo-grid-section {
    background-color: var(--color-deep-navy);
    padding: 60px 0;
}

.page-khuyen-mai__promo-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.page-khuyen-mai__promo-card {
    background-color: var(--color-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border);
}

.page-khuyen-mai__promo-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

.page-khuyen-mai__promo-card-image {
    width: 100%;
    height: 220px; /* Fixed height for consistency */
    object-fit: cover;
    display: block;
}

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

.page-khuyen-mai__promo-card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.3;
}

.page-khuyen-mai__promo-card-title a {
    color: var(--color-gold);
    text-decoration: none;
    transition: color 0.3s ease;
}

.page-khuyen-mai__promo-card-title a:hover {
    color: var(--color-glow);
}

.page-khuyen-mai__promo-card-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.page-khuyen-mai__promo-card-date {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 15px;
}

.page-khuyen-mai__btn-text {
    display: inline-block;
    color: var(--color-button-gradient-top);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.page-khuyen-mai__btn-text:hover {
    color: var(--color-glow);
    text-decoration: underline;
}

/* Guide Section */
.page-khuyen-mai__guide-section {
    padding: 80px 0;
    background-color: var(--color-deep-navy);
}

.page-khuyen-mai__guide-layout {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 50px;
}

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

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

.page-khuyen-mai__guide-side-image {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.page-khuyen-mai__guide-steps {
    list-style: none;
    padding: 0;
    margin-top: 30px;
    counter-reset: step-counter;
}

.page-khuyen-mai__guide-step-item {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 20px 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease;
}

.page-khuyen-mai__guide-step-item:hover {
    transform: translateX(5px);
}

.page-khuyen-mai__guide-step-title {
    font-size: 1.3rem;
    color: var(--color-gold);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-khuyen-mai__guide-step-title::before {
    content: counter(step-counter);
    counter-increment: step-counter;
    background: linear-gradient(180deg, var(--color-button-gradient-top) 0%, var(--color-button-gradient-bottom) 100%);
    color: var(--color-text-main);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
}

.page-khuyen-mai__guide-step-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* FAQ Section */
.page-khuyen-mai__faq-section {
    padding: 80px 0;
    background-color: var(--color-deep-navy);
}

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

.page-khuyen-mai__faq-item {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: 0 4px 15px 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: 1.2rem;
    font-weight: 600;
    color: var(--color-gold);
    cursor: pointer;
    list-style: none; /* Hide default details marker */
    position: relative;
}

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

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

.page-khuyen-mai__faq-toggle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-glow);
    margin-left: 15px;
    transition: transform 0.3s ease;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-toggle {
    transform: rotate(45deg); /* Change + to X or rotate it */
}

.page-khuyen-mai__faq-answer {
    padding: 0 25px 20px;
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.4s ease-out;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-answer {
    max-height: 500px; /* Adjust as needed for content */
    transition: max-height 0.5s ease-in;
}

.page-khuyen-mai__faq-answer p {
    margin: 0;
    padding-top: 10px;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .page-khuyen-mai__hero-container {
        flex-direction: column;
        text-align: center;
    }

    .page-khuyen-mai__hero-content {
        order: 2; /* Content below image on smaller screens */
    }

    .page-khuyen-mai__hero-image {
        order: 1; /* Image above content on smaller screens */
    }

    .page-khuyen-mai__main-title,
    .page-khuyen-mai__description,
    .page-khuyen-mai__section-title,
    .page-khuyen-mai__section-description {
        text-align: center;
    }

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

    .page-khuyen-mai__guide-layout {
        flex-direction: column;
        text-align: center;
    }

    .page-khuyen-mai__guide-content {
        order: 2;
    }

    .page-khuyen-mai__guide-image {
        order: 1;
    }

    .page-khuyen-mai__guide-step-title {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    /* HERO Section */
    .page-khuyen-mai__hero-section {
        padding-top: 10px !important; /* Ensure small top padding */
        padding-bottom: 40px;
    }
    .page-khuyen-mai__hero-container {
        padding: 15px;
        gap: 25px;
    }
    .page-khuyen-mai__main-title {
        font-size: clamp(2rem, 8vw, 2.5rem);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__description {
        font-size: 1rem;
        margin-bottom: 25px;
    }
    .page-khuyen-mai__cta-buttons {
        flex-direction: column; /* Stack buttons vertically */
        gap: 10px;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 15px; /* Add padding to container */
    }
    .page-khuyen-mai__btn-primary,
    .page-khuyen-mai__btn-secondary {
        max-width: 100% !important;
        width: 100% !important;
        padding: 12px 20px;
        font-size: 1rem;
        white-space: normal !important;
        word-wrap: break-word !important;
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__hero-side-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
    }

    /* General Section Styles */
    .page-khuyen-mai__container {
        padding: 20px 15px !important;
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__section-title {
        font-size: clamp(1.8rem, 7vw, 2.2rem);
        margin-bottom: 15px;
    }
    .page-khuyen-mai__section-description {
        font-size: 0.95rem;
        margin-bottom: 30px;
    }

    /* Promo Grid Section */
    .page-khuyen-mai__promo-grid-section {
        padding: 40px 0;
    }
    .page-khuyen-mai__promo-cards {
        grid-template-columns: 1fr; /* Single column for promo cards */
        gap: 20px;
    }
    .page-khuyen-mai__promo-card-image {
        height: 180px; /* Adjust height for mobile */
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important; /* Ensure responsiveness */
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__promo-card-content {
        padding: 20px;
    }
    .page-khuyen-mai__promo-card-title {
        font-size: 1.3rem;
    }
    .page-khuyen-mai__promo-card-text {
        font-size: 0.9rem;
    }

    /* Guide Section */
    .page-khuyen-mai__guide-section {
        padding: 50px 0;
    }
    .page-khuyen-mai__guide-layout {
        gap: 30px;
    }
    .page-khuyen-mai__guide-side-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
    }
    .page-khuyen-mai__guide-step-item {
        padding: 15px 20px;
    }
    .page-khuyen-mai__guide-step-title {
        font-size: 1.1rem;
        flex-direction: column; /* Stack step number and title */
        gap: 5px;
    }
    .page-khuyen-mai__guide-step-title::before {
        width: 25px;
        height: 25px;
        font-size: 0.9rem;
    }
    .page-khuyen-mai__guide-step-text {
        font-size: 0.9rem;
    }

    /* FAQ Section */
    .page-khuyen-mai__faq-section {
        padding: 50px 0;
    }
    .page-khuyen-mai__faq-question {
        padding: 15px 20px;
        font-size: 1.1rem;
    }
    .page-khuyen-mai__faq-toggle {
        font-size: 1.3rem;
    }
    .page-khuyen-mai__faq-answer {
        padding: 0 20px 15px;
        font-size: 0.9rem;
    }

    /* Universal image responsive for content area */
    .page-khuyen-mai img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
    }
    .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;
    }
}