/* style/giai-ma-keo-da-ga.css */

:root {
    --primary-color: #017439;
    --secondary-color: #FFFFFF;
    --text-color-dark: #333333;
    --text-color-light: #ffffff;
    --button-register-bg: #C30808;
    --button-login-bg: #C30808;
    --button-register-text: #FFFF00;
    --button-login-text: #FFFF00;
    --border-color: #e0e0e0;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
}

.page-giai-ma-keo-da-ga {
    font-family: 'Arial', sans-serif;
    color: var(--text-color-dark);
    background-color: var(--secondary-color); /* Body background is white, so text is dark */
    line-height: 1.6;
}

.page-giai-ma-keo-da-ga__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.page-giai-ma-keo-da-ga__top-section {
    padding-top: var(--spacing-sm); /* Small top padding, body handles header offset */
    padding-bottom: var(--spacing-lg);
    text-align: center;
    background-color: var(--secondary-color);
}

.page-giai-ma-keo-da-ga__main-title {
    font-size: clamp(2em, 4vw, 2.8em); /* Clamp for responsive H1, not fixed large size */
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.page-giai-ma-keo-da-ga__intro-text {
    font-size: 1.1em;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-color-dark);
}

.page-giai-ma-keo-da-ga__top-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.page-giai-ma-keo-da-ga__btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.3s ease, transform 0.2s ease;
    max-width: 100%;
    box-sizing: border-box;
    white-space: normal;
    word-wrap: break-word;
    text-align: center;
}

.page-giai-ma-keo-da-ga__btn--register {
    background-color: var(--button-register-bg);
    color: var(--button-register-text);
    border: 2px solid var(--button-register-bg);
}

.page-giai-ma-keo-da-ga__btn--register:hover {
    background-color: darken(var(--button-register-bg), 10%);
    transform: translateY(-2px);
}

.page-giai-ma-keo-da-ga__btn--login {
    background-color: var(--button-login-bg);
    color: var(--button-login-text);
    border: 2px solid var(--button-login-bg);
}

.page-giai-ma-keo-da-ga__btn--login:hover {
    background-color: darken(var(--button-login-bg), 10%);
    transform: translateY(-2px);
}

.page-giai-ma-keo-da-ga__btn--primary {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    border: 2px solid var(--primary-color);
}

.page-giai-ma-keo-da-ga__btn--primary:hover {
    background-color: darken(var(--primary-color), 10%);
    transform: translateY(-2px);
}

.page-giai-ma-keo-da-ga__btn--secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.page-giai-ma-keo-da-ga__btn--secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    transform: translateY(-2px);
}

.page-giai-ma-keo-da-ga__article-section {
    padding: var(--spacing-lg) 0;
    background-color: var(--secondary-color);
}

.page-giai-ma-keo-da-ga__article-wrap {
    max-width: 1150px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.page-giai-ma-keo-da-ga__content-block {
    margin-bottom: var(--spacing-lg) * 1.5;
}

.page-giai-ma-keo-da-ga__heading-2 {
    font-size: 2em;
    color: var(--primary-color);
    margin-top: var(--spacing-lg) * 2;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
}

.page-giai-ma-keo-da-ga__heading-3 {
    font-size: 1.5em;
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.page-giai-ma-keo-da-ga p {
    margin-bottom: var(--spacing-md);
    color: var(--text-color-dark);
}

.page-giai-ma-keo-da-ga ul {
    list-style-type: disc;
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-color-dark);
}

.page-giai-ma-keo-da-ga ul li {
    margin-bottom: var(--spacing-sm) / 2;
}

.page-giai-ma-keo-da-ga__figure {
    margin: var(--spacing-lg) auto;
    text-align: center;
    max-width: 100%;
}

.page-giai-ma-keo-da-ga__figure img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
}

.page-giai-ma-keo-da-ga__figcaption {
    font-style: italic;
    font-size: 0.9em;
    color: #666;
    margin-top: var(--spacing-sm);
}

.page-giai-ma-keo-da-ga__info-card {
    background-color: #f9f9f9;
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--primary-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
    color: var(--text-color-dark);
}

.page-giai-ma-keo-da-ga__card-title {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.page-giai-ma-keo-da-ga__promo-box {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    padding: var(--spacing-lg);
    border-radius: 10px;
    text-align: center;
    margin: var(--spacing-lg) 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.page-giai-ma-keo-da-ga__promo-title {
    font-size: 2em;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    color: var(--text-color-light);
}

.page-giai-ma-keo-da-ga__promo-box p {
    font-size: 1.1em;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color-light);
}

.page-giai-ma-keo-da-ga__button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.page-giai-ma-keo-da-ga__button-group--bottom {
    margin-top: var(--spacing-lg) * 2;
}

.page-giai-ma-keo-da-ga__faq-question {
    font-size: 1.2em;
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    cursor: pointer;
    padding-left: 20px;
    position: relative;
}

.page-giai-ma-keo-da-ga__faq-question::before {
    content: 'Q.';
    position: absolute;
    left: 0;
    color: #C30808;
    font-weight: 700;
}

.page-giai-ma-keo-da-ga__faq-answer {
    margin-left: 20px;
    margin-bottom: var(--spacing-md);
    padding-left: 10px;
    border-left: 3px solid var(--border-color);
    color: var(--text-color-dark);
}

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

/* Tablet and Mobile */
@media (max-width: 1024px) {
    .page-giai-ma-keo-da-ga__main-title {
        font-size: clamp(1.8em, 5vw, 2.5em);
    }

    .page-giai-ma-keo-da-ga__intro-text {
        font-size: 1em;
    }

    .page-giai-ma-keo-da-ga__heading-2 {
        font-size: 1.8em;
    }

    .page-giai-ma-keo-da-ga__heading-3 {
        font-size: 1.3em;
    }

    .page-giai-ma-keo-da-ga__promo-title {
        font-size: 1.8em;
    }

    .page-giai-ma-keo-da-ga__promo-box p {
        font-size: 1em;
    }

    .page-giai-ma-keo-da-ga__btn {
        padding: 10px 20px;
    }
}

/* Mobile-specific styles (max-width: 768px) */
@media (max-width: 768px) {
    /* 1. Top section (title + CTA) */
    .page-giai-ma-keo-da-ga__top-section {
        padding-top: var(--spacing-sm) !important; /* Small top padding */
        padding-bottom: var(--spacing-md);
    }

    .page-giai-ma-keo-da-ga__main-title {
        font-size: clamp(1.5em, 7vw, 2em) !important; /* Smaller on mobile */
        margin-bottom: var(--spacing-sm);
    }

    .page-giai-ma-keo-da-ga__intro-text {
        font-size: 0.95em;
        margin-bottom: var(--spacing-md);
        padding: 0 10px;
    }

    .page-giai-ma-keo-da-ga__top-cta {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: 0 var(--spacing-md);
    }

    /* 2. Single column long article containers */
    .page-giai-ma-keo-da-ga__article-wrap {
        padding: 0 var(--spacing-sm) !important;
    }

    .page-giai-ma-keo-da-ga__content-block {
        margin-bottom: var(--spacing-lg);
    }

    .page-giai-ma-keo-da-ga__heading-2 {
        font-size: 1.5em !important;
        margin-top: var(--spacing-lg);
        margin-bottom: var(--spacing-sm);
    }

    .page-giai-ma-keo-da-ga__heading-3 {
        font-size: 1.2em !important;
        margin-top: var(--spacing-md);
        margin-bottom: var(--spacing-sm) / 2;
    }

    .page-giai-ma-keo-da-ga p,
    .page-giai-ma-keo-da-ga ul li,
    .page-giai-ma-keo-da-ga__figcaption,
    .page-giai-ma-keo-da-ga__info-card p,
    .page-giai-ma-keo-da-ga__promo-box p,
    .page-giai-ma-keo-da-ga__faq-answer {
        font-size: 1em;
    }

    .page-giai-ma-keo-da-ga__info-card,
    .page-giai-ma-keo-da-ga__promo-box {
        padding: var(--spacing-md) !important;
        margin: var(--spacing-md) 0 !important;
    }

    .page-giai-ma-keo-da-ga__card-title {
        font-size: 1.1em !important;
    }

    .page-giai-ma-keo-da-ga__promo-title {
        font-size: 1.5em !important;
        margin-bottom: var(--spacing-sm);
    }

    /* 3. General images and figures */
    .page-giai-ma-keo-da-ga img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-giai-ma-keo-da-ga__figure {
        margin: var(--spacing-md) auto;
        padding: 0;
    }

    /* Ensure all content containers are responsive */
    .page-giai-ma-keo-da-ga__section,
    .page-giai-ma-keo-da-ga__card,
    .page-giai-ma-keo-da-ga__container {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* 4. Buttons and button containers */
    .page-giai-ma-keo-da-ga__btn,
    .page-giai-ma-keo-da-ga a[class*="button"],
    .page-giai-ma-keo-da-ga 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-giai-ma-keo-da-ga__button-group {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: 0 var(--spacing-md);
    }

    .page-giai-ma-keo-da-ga__button-group--bottom {
        margin-top: var(--spacing-lg);
    }

    /* 5. FAQ blocks */
    .page-giai-ma-keo-da-ga__faq-question {
        font-size: 1.1em !important;
        margin-top: var(--spacing-md);
        padding-left: 15px;
    }

    .page-giai-ma-keo-da-ga__faq-question::before {
        left: -5px;
    }

    .page-giai-ma-keo-da-ga__faq-answer {
        margin-left: 15px;
        padding-left: 8px;
    }
}