.page-cong-dong {
    font-family: Arial, sans-serif;
    color: #1F2D3D; /* Text Main */
    background-color: #F4F7FB; /* Background */
}

.page-cong-dong__hero-section {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 10px; /* Adjusted for header offset */
    overflow: hidden;
    box-sizing: border-box;
}

.page-cong-dong__hero-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    max-height: 600px;
}

.page-cong-dong__hero-content {
    position: relative;
    z-index: 1;
    padding: 40px 20px;
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    transform: translateY(-50px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.page-cong-dong__hero-title {
    font-size: 2.8em;
    font-weight: 700;
    color: #2F6BFF;
    margin-bottom: 20px;
    line-height: 1.2;
}

.page-cong-dong__hero-description {
    font-size: 1.1em;
    color: #1F2D3D;
    margin-bottom: 30px;
    line-height: 1.6;
}

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

.page-cong-dong__btn-primary,
.page-cong-dong__btn-secondary {
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05em;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    max-width: 100%;
    white-space: normal;
    word-wrap: break-word;
}

.page-cong-dong__btn-primary {
    background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
    color: #ffffff;
    border: none;
}

.page-cong-dong__btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(47, 107, 255, 0.4);
}

.page-cong-dong__btn-secondary {
    background-color: #ffffff;
    color: #2F6BFF;
    border: 2px solid #2F6BFF;
}

.page-cong-dong__btn-secondary:hover {
    background-color: #F4F7FB;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(47, 107, 255, 0.2);
}

.page-cong-dong__section-spacing {
    padding: 80px 0;
}

.page-cong-dong__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.page-cong-dong__section-title {
    font-size: 2.2em;
    font-weight: 700;
    color: #2F6BFF;
    text-align: center;
    margin-bottom: 20px;
}

.page-cong-dong__section-subtitle {
    font-size: 1.1em;
    color: #1F2D3D;
    text-align: center;
    margin-bottom: 40px;
    line-height: 1.6;
}

.page-cong-dong__text-block {
    font-size: 1em;
    line-height: 1.7;
    color: #1F2D3D;
    margin-bottom: 20px;
}

.page-cong-dong__about-section .page-cong-dong__content-wrapper {
    display: flex;
    align-items: center;
    gap: 40px;
}

.page-cong-dong__about-section .page-cong-dong__text-block {
    flex: 1;
}

.page-cong-dong__image-content {
    flex: 1;
    max-width: 50%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.page-cong-dong__dark-section {
    background-color: #2F6BFF;
    color: #ffffff;
}

.page-cong-dong__dark-section .page-cong-dong__section-title,
.page-cong-dong__dark-section .page-cong-dong__section-subtitle,
.page-cong-dong__dark-section .page-cong-dong__card-title,
.page-cong-dong__dark-section .page-cong-dong__card-description {
    color: #ffffff;
}

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

.page-cong-dong__activity-card {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-cong-dong__activity-card .page-cong-dong__card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 20px;
}

.page-cong-dong__activity-card .page-cong-dong__card-title {
    font-size: 1.4em;
    font-weight: 700;
    color: #2F6BFF;
    margin-bottom: 15px;
}

.page-cong-dong__activity-card .page-cong-dong__card-description {
    font-size: 0.95em;
    line-height: 1.6;
    color: #1F2D3D;
    margin-bottom: 20px;
    flex-grow: 1;
}

.page-cong-dong__btn-text {
    color: #2F6BFF;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.page-cong-dong__btn-text:hover {
    text-decoration: underline;
    color: #4A8BFF;
}

.page-cong-dong__benefit-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.page-cong-dong__benefit-item {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-cong-dong__benefit-icon {
    width: 60px;
    height: 60px;
    object-fit: contain;
    margin-bottom: 20px;
}

.page-cong-dong__benefit-heading {
    font-size: 1.3em;
    font-weight: 700;
    color: #2F6BFF;
    margin-bottom: 10px;
}

.page-cong-dong__benefit-text {
    font-size: 0.95em;
    line-height: 1.6;
    color: #1F2D3D;
}

.page-cong-dong__join-guide-section.page-cong-dong__dark-bg {
    background-color: #2F6BFF; /* Main Color */
    color: #ffffff;
}

.page-cong-dong__join-guide-section .page-cong-dong__section-title,
.page-cong-dong__join-guide-section .page-cong-dong__section-subtitle {
    color: #ffffff;
}

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

.page-cong-dong__step-card {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.page-cong-dong__step-number {
    font-size: 2.5em;
    font-weight: 700;
    color: #A5C4FF; /* Glow */
    margin-bottom: 15px;
    display: block;
}

.page-cong-dong__step-title {
    font-size: 1.4em;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 10px;
}

.page-cong-dong__step-description {
    font-size: 0.95em;
    line-height: 1.6;
    color: #ffffff;
}

.page-cong-dong__cta-bottom {
    text-align: center;
    margin-top: 60px;
}

.page-cong-dong__news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.page-cong-dong__news-card {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.page-cong-dong__news-card .page-cong-dong__card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.page-cong-dong__news-card .page-cong-dong__card-title {
    font-size: 1.25em;
    font-weight: 700;
    color: #2F6BFF;
    padding: 20px 20px 10px;
    line-height: 1.4;
    flex-grow: 1;
}

.page-cong-dong__news-card .page-cong-dong__card-title a {
    color: inherit;
    text-decoration: none;
}

.page-cong-dong__news-card .page-cong-dong__card-title a:hover {
    text-decoration: underline;
}

.page-cong-dong__news-card .page-cong-dong__card-meta {
    font-size: 0.85em;
    color: #6FA3FF;
    padding: 0 20px;
    margin-bottom: 10px;
}

.page-cong-dong__news-card .page-cong-dong__card-description {
    font-size: 0.9em;
    line-height: 1.6;
    color: #1F2D3D;
    padding: 0 20px 20px;
    flex-grow: 1;
}

.page-cong-dong__news-card .page-cong-dong__btn-text {
    display: block;
    text-align: right;
    padding: 0 20px 20px;
    margin-top: auto;
}

.page-cong-dong__view-all {
    text-align: center;
}

.page-cong-dong__faq-list {
    margin-top: 40px;
}

.page-cong-dong__faq-item {
    background-color: #ffffff;
    border: 1px solid #D6E2FF; /* Border */
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
}

.page-cong-dong__faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    font-size: 1.1em;
    font-weight: 600;
    color: #1F2D3D;
    cursor: pointer;
    background-color: #f9fbfd;
    border-bottom: 1px solid #D6E2FF;
}

.page-cong-dong__faq-item[open] .page-cong-dong__faq-question {
    border-bottom: 1px solid #D6E2FF;
}

.page-cong-dong__faq-qtext {
    flex-grow: 1;
    color: #1F2D3D;
}

.page-cong-dong__faq-toggle {
    font-size: 1.5em;
    font-weight: 600;
    color: #2F6BFF;
    margin-left: 20px;
    line-height: 1;
}

.page-cong-dong__faq-item[open] .page-cong-dong__faq-toggle {
    content: '−';
}

.page-cong-dong__faq-answer {
    padding: 20px;
    font-size: 0.95em;
    line-height: 1.7;
    color: #1F2D3D;
}

.page-cong-dong__faq-answer p {
    margin-bottom: 10px;
}

.page-cong-dong__faq-answer a {
    color: #2F6BFF;
    text-decoration: underline;
}

.page-cong-dong__cta-final {
    background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
    text-align: center;
    color: #ffffff;
}

.page-cong-dong__cta-final .page-cong-dong__section-title,
.page-cong-dong__cta-final .page-cong-dong__section-subtitle {
    color: #ffffff;
}

.page-cong-dong__btn-large {
    padding: 18px 40px;
    font-size: 1.2em;
    border-radius: 10px;
}

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

.page-cong-dong__section,
.page-cong-dong__card,
.page-cong-dong__container,
.page-cong-dong__content-wrapper {
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

/* --- Mobile Styles (max-width: 768px) --- */
@media (max-width: 768px) {
    .page-cong-dong {
        font-size: 16px;
        line-height: 1.6;
    }

    .page-cong-dong__hero-section {
        padding-top: 10px !important;
    }

    .page-cong-dong__hero-image {
        object-fit: contain !important;
        max-height: none !important;
        aspect-ratio: unset !important;
    }

    .page-cong-dong__hero-content {
        padding: 30px 15px;
        transform: translateY(-30px);
        margin: 0 15px;
        width: calc(100% - 30px);
    }

    .page-cong-dong__hero-title {
        font-size: 1.8em;
        margin-bottom: 15px;
    }

    .page-cong-dong__hero-description {
        font-size: 1em;
        margin-bottom: 20px;
    }

    .page-cong-dong__cta-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .page-cong-dong__btn-primary,
    .page-cong-dong__btn-secondary {
        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-cong-dong__section-spacing {
        padding: 40px 0;
    }

    .page-cong-dong__container {
        padding: 0 15px;
    }

    .page-cong-dong__section-title {
        font-size: 1.8em;
        margin-bottom: 15px;
    }

    .page-cong-dong__section-subtitle {
        font-size: 1em;
        margin-bottom: 30px;
    }

    .page-cong-dong__about-section .page-cong-dong__content-wrapper {
        flex-direction: column;
        gap: 30px;
    }

    .page-cong-dong__image-content {
        max-width: 100%;
    }

    .page-cong-dong__activity-grid,
    .page-cong-dong__benefit-list,
    .page-cong-dong__guide-steps,
    .page-cong-dong__news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-cong-dong__activity-card .page-cong-dong__card-image {
        height: 180px;
    }

    .page-cong-dong__activity-card .page-cong-dong__card-title,
    .page-cong-dong__benefit-heading,
    .page-cong-dong__step-title {
        font-size: 1.2em;
    }

    .page-cong-dong__news-card .page-cong-dong__card-title {
        font-size: 1.1em;
        padding: 15px 15px 8px;
    }

    .page-cong-dong__news-card .page-cong-dong__card-meta,
    .page-cong-dong__news-card .page-cong-dong__card-description {
        padding: 0 15px;
    }

    .page-cong-dong__news-card .page-cong-dong__btn-text {
        padding: 0 15px 15px;
    }

    .page-cong-dong__faq-question {
        padding: 15px;
        font-size: 1em;
    }

    .page-cong-dong__faq-toggle {
        font-size: 1.2em;
    }

    .page-cong-dong__faq-answer {
        padding: 15px;
        font-size: 0.9em;
    }

    .page-cong-dong__cta-bottom {
        margin-top: 40px;
    }

    .page-cong-dong__btn-large {
        padding: 15px 30px;
        font-size: 1.1em;
    }

    /* General image and container responsiveness */
    .page-cong-dong img {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }

    .page-cong-dong__section,
    .page-cong-dong__card,
    .page-cong-dong__container,
    .page-cong-dong__content-wrapper {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 15px;
        padding-right: 15px;
    }

    /* Button container mobile adaptation */
    .page-cong-dong__cta-buttons,
    .page-cong-dong__button-group,
    .page-cong-dong__btn-container {
        max-width: 100% !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding-left: 0;
        padding-right: 0;
        flex-wrap: wrap !important;
        gap: 10px;
    }

    .page-cong-dong__cta-buttons {
        display: flex;
        flex-direction: column;
    }
}

/* No winner list or game grid specific rules for this page as per requirements */