:root {
    --primary-color: #F2C14E;
    --secondary-color: #FFD36B;
    --card-bg: #111111;
    --body-bg: #0A0A0A;
    --text-main: #FFF6D6;
    --border-color: #3A2A12;
    --glow-color: #FFD36B;
    --button-gradient: linear-gradient(180deg, #FFD86A 0%, #DDA11D 100%);
}

.page-khuyen-mai {
    font-family: Arial, sans-serif;
    color: var(--text-main); /* Light text on dark body background */
    background-color: var(--body-bg);
    line-height: 1.6;
}

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

.page-khuyen-mai__section-title {
    font-size: 2.5em;
    color: var(--secondary-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: 3px;
    background-color: var(--primary-color);
}

.page-khuyen-mai__text-block {
    font-size: 1.1em;
    margin-bottom: 20px;
    text-align: justify;
}

.page-khuyen-mai__hero-section {
    position: relative;
    padding-top: 10px; /* Small top padding, body handles --header-offset */
    background-color: var(--card-bg);
    overflow: hidden;
}

.page-khuyen-mai__hero-image-wrapper {
    width: 100%;
    max-height: 600px;
    overflow: hidden;
}

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

.page-khuyen-mai__hero-content {
    text-align: center;
    padding: 40px 20px;
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    margin-top: -80px; /* Pull up over the image slightly */
    position: relative;
    z-index: 1;
}

.page-khuyen-mai__main-title {
    font-size: clamp(2em, 3.5vw, 3em); /* Responsive H1 font size */
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-weight: bold;
    line-height: 1.2;
}

.page-khuyen-mai__lead-text {
    font-size: 1.2em;
    margin-bottom: 30px;
    color: var(--text-main);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.page-khuyen-mai__btn-primary,
.page-khuyen-mai__btn-secondary {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    transition: all 0.3s ease;
    text-align: center;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    max-width: 100%;
}

.page-khuyen-mai__btn-primary {
    background: var(--button-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 5px 15px rgba(242, 193, 78, 0.4);
}

.page-khuyen-mai__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(242, 193, 78, 0.6);
}

.page-khuyen-mai__btn-secondary {
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
    box-shadow: 0 0 10px rgba(255, 211, 107, 0.3);
}

.page-khuyen-mai__btn-secondary:hover {
    background-color: var(--secondary-color);
    color: var(--card-bg);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(255, 211, 107, 0.6);
}

.page-khuyen-mai__btn-lg {
    padding: 18px 40px;
    font-size: 1.2em;
}

.page-khuyen-mai__intro-section {
    padding: 60px 0;
    background-color: var(--body-bg);
}

.page-khuyen-mai__promotion-types-section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

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

.page-khuyen-mai__promotion-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-khuyen-mai__promotion-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(var(--primary-color-rgb), 0.5);
}

.page-khuyen-mai__promotion-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

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

.page-khuyen-mai__card-title {
    font-size: 1.6em;
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-weight: bold;
}

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

.page-khuyen-mai__card-button {
    display: inline-block;
    padding: 10px 20px;
    background: var(--button-gradient);
    color: #ffffff;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.95em;
    transition: background-color 0.3s ease;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    max-width: 100%;
}

.page-khuyen-mai__card-button:hover {
    opacity: 0.9;
}

.page-khuyen-mai__guide-section {
    padding: 60px 0;
    background-color: var(--body-bg);
}

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

.page-khuyen-mai__guide-steps {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.page-khuyen-mai__guide-step-item {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__step-title {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.page-khuyen-mai__step-text {
    font-size: 1.05em;
    color: var(--text-main);
    margin-bottom: 20px;
}

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

.page-khuyen-mai__guide-image {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    display: block;
}

.page-khuyen-mai__terms-note {
    text-align: center;
    font-size: 0.95em;
    color: var(--text-main);
    margin-top: 40px;
    opacity: 0.8;
}

.page-khuyen-mai__benefits-section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

.page-khuyen-mai__benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.page-khuyen-mai__benefit-item {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-khuyen-mai__benefit-title {
    font-size: 1.5em;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.page-khuyen-mai__benefit-text {
    font-size: 1em;
    color: var(--text-main);
}

.page-khuyen-mai__centered-cta {
    text-align: center;
    margin-top: 40px;
}

.page-khuyen-mai__benefit-main-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    margin-bottom: 30px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.page-khuyen-mai__faq-section {
    padding: 60px 0;
    background-color: var(--body-bg);
}

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

.page-khuyen-mai__faq-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 2px 8px 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: 1.2em;
    font-weight: bold;
    color: var(--secondary-color);
    cursor: pointer;
    list-style: none; /* For <summary> tag */
    -webkit-touch-callout: none; /* Disable callout on iOS */
    -webkit-user-select: none;   /* Disable text selection on iOS */
    -khtml-user-select: none;    /* Disable text selection on Konqueror HTML */
    -moz-user-select: none;      /* Disable text selection on Firefox */
    -ms-user-select: none;       /* Disable text selection on Internet Explorer/Edge */
    user-select: none;           /* Disable text selection on modern browsers */
}

.page-khuyen-mai__faq-question::-webkit-details-marker {
    display: none;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-question {
    border-bottom: 1px solid var(--border-color);
}

.page-khuyen-mai__faq-toggle {
    font-size: 1.5em;
    transition: transform 0.3s ease;
}

.page-khuyen-mai__faq-item[open] .page-khuyen-mai__faq-toggle {
    transform: rotate(45deg);
}

.page-khuyen-mai__faq-answer {
    padding: 15px 25px 25px 25px;
    font-size: 1.05em;
    color: var(--text-main);
}

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

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

.page-khuyen-mai__faq-link:hover {
    color: var(--secondary-color);
}

.page-khuyen-mai__final-cta-section {
    padding: 60px 0 80px 0;
    background-color: var(--card-bg);
    text-align: center;
}

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

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

/* Common button responsive styles */
.page-khuyen-mai__cta-buttons,
.page-khuyen-mai__button-group,
.page-khuyen-mai__btn-container {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

@media (max-width: 1024px) {
    .page-khuyen-mai__section-title {
        font-size: 2em;
    }

    .page-khuyen-mai__lead-text {
        font-size: 1.1em;
    }

    .page-khuyen-mai__hero-content {
        margin-top: -60px;
        padding: 30px 15px;
    }

    .page-khuyen-mai__promotion-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
    }

    .page-khuyen-mai__promotion-image {
        height: 200px;
    }

    .page-khuyen-mai__card-title {
        font-size: 1.4em;
    }

    .page-khuyen-mai__guide-content {
        flex-direction: column;
        align-items: center;
    }

    .page-khuyen-mai__guide-steps {
        width: 100%;
    }

    .page-khuyen-mai__guide-image-wrapper {
        width: 100%;
        max-width: 600px;
        margin-top: 30px;
    }

    .page-khuyen-mai__benefits-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
    }

    .page-khuyen-mai__benefit-title {
        font-size: 1.3em;
    }
}

@media (max-width: 768px) {
    .page-khuyen-mai__container {
        padding: 15px;
    }

    .page-khuyen-mai__hero-section {
        padding-top: 10px !important;
    }

    .page-khuyen-mai__hero-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-khuyen-mai__hero-content {
        margin-top: -40px;
        padding: 25px 10px;
    }

    .page-khuyen-mai__main-title {
        font-size: clamp(1.8em, 7vw, 2.5em);
    }

    .page-khuyen-mai__lead-text {
        font-size: 1em;
    }

    .page-khuyen-mai__cta-buttons {
        flex-direction: column;
        gap: 15px;
        padding-left: 15px;
        padding-right: 15px;
    }

    .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"] {
        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__section-title {
        font-size: 1.8em;
        margin-bottom: 30px;
    }

    .page-khuyen-mai__promotion-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .page-khuyen-mai__promotion-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-khuyen-mai__card-title {
        font-size: 1.3em;
    }

    .page-khuyen-mai__guide-content {
        gap: 30px;
    }

    .page-khuyen-mai__guide-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-khuyen-mai__benefits-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .page-khuyen-mai__benefit-title {
        font-size: 1.2em;
    }

    .page-khuyen-mai__benefit-main-image {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-khuyen-mai__faq-question {
        font-size: 1.1em;
        padding: 18px 20px;
    }

    .page-khuyen-mai__faq-answer {
        padding: 12px 20px 20px 20px;
        font-size: 1em;
    }

    .page-khuyen-mai__btn-lg {
        padding: 15px 30px;
        font-size: 1.1em;
    }

    /* Ensure all content containers are constrained */
    .page-khuyen-mai__intro-section .page-khuyen-mai__container,
    .page-khuyen-mai__promotion-types-section .page-khuyen-mai__container,
    .page-khuyen-mai__guide-section .page-khuyen-mai__container,
    .page-khuyen-mai__benefits-section .page-khuyen-mai__container,
    .page-khuyen-mai__faq-section .page-khuyen-mai__container,
    .page-khuyen-mai__final-cta-section .page-khuyen-mai__container {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }
}