/* About Us Page Styles - Following design-system.md standards */

/* Section 1: Giới thiệu tổng quan */
.about-intro {
    margin-top: 6.25rem;
    margin-bottom: 6.25rem;
}

.about-intro-title {
    color: var(--mau-chu-dao);
    text-align: center;
    margin-bottom: 40px;
}

.about-intro-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.about-intro-image img {
    border-radius: 20px;
    object-fit: cover;
}

/* Section 2: Vision - Mission */
.about-vision-mission {
    margin-top: 6.25rem;
    margin-bottom: 6.25rem;
    background-color: #f5f8f9;
    padding: 100px 0;
}

.about-vision-mission-title {
    color: var(--mau-chu-dao);
    text-align: center;
    margin-bottom: 40px;
}

.about-vision-card,
.about-mission-card {
    background: #ffffff;
    padding: 40px;
    border-radius: 20px;
    height: 100%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s ease;
}

.about-vision-card:hover,
.about-mission-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.about-vision-icon,
.about-mission-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--mau-phu1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.about-vision-icon i,
.about-mission-icon i {
    font-size: 30px;
    color: #ffffff;
}

.about-vision-heading,
.about-mission-heading {
    color: var(--mau-chu-dao);
    margin-bottom: 20px;
}

/* Section 3: Lịch sử hình thành */
.about-history {
    margin-top: 6.25rem;
    margin-bottom: 6.25rem;
}

.about-history-title {
    color: var(--mau-chu-dao);
    text-align: center;
    margin-bottom: 40px;
}

.about-history-timeline {
    position: relative;
    padding-left: 60px;
}

.about-history-timeline::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: #e6e7e8;
}

.about-history-item {
    position: relative;
    margin-bottom: 60px;
    padding-left: 40px;
}

.about-history-item:last-child {
    margin-bottom: 0;
}

.about-history-year {
    position: absolute;
    left: -64px;
    top: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--mau-phu1);
    border: 4px solid var(--mau-chu-dao);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.about-history-year-text {
    font-family: var(--font-primary);
    font-weight: 800;
    font-size: 16px;
    color: var(--mau-chu-dao);
}

.about-history-content {
    background: #ffffff;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.about-history-item-title {
    color: var(--mau-chu-dao);
    margin-bottom: 12px;
}

/* Section 4: Đội ngũ lãnh đạo (Hidden) */
.about-leadership {
    margin-top: 6.25rem;
    margin-bottom: 6.25rem;
}

.about-leadership-title {
    color: var(--mau-chu-dao);
    text-align: center;
    margin-bottom: 40px;
}

.about-leader-card {
    background: #ffffff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    cursor: pointer;
}

.about-leader-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px);
}

.about-leader-image {
    border-radius: 20px 20px 0 0;
    object-fit: cover;
    height: 300px;
}

.about-leader-info {
    padding: 24px;
}

.about-leader-name {
    color: var(--mau-chu-dao);
    margin-bottom: 8px;
}

.about-leader-position {
    color: var(--mau-phu1);
    font-weight: 600;
    margin-bottom: 12px;
}

.about-leader-bio {
    color: #242424;
}

/* Section 5: Đối tác */
.about-partners {
    margin-top: 6.25rem;
    margin-bottom: 6.25rem;
    background-color: #f5f8f9;
    padding: 100px 0;
}

.about-partners-title {
    color: var(--mau-chu-dao);
    text-align: center;
    margin-bottom: 60px;
}

.about-partners-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 40px 50px;
    max-width: 1200px;
    margin: 0 auto;
}

.about-partner-item {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    padding: 20px 30px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.about-partner-item:hover {
    transform: translateY(-3px);
}

.about-partner-logo {
    max-width: 140px;
    max-height: 80px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.about-partner-item:hover .about-partner-logo {
    filter: grayscale(0%);
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 991px) {
    .about-partners-grid {
        gap: 30px 35px;
    }

    .about-partner-item {
        padding: 15px 20px;
    }

    .about-partner-logo {
        max-width: 120px;
        max-height: 70px;
    }

    .about-vision-mission,
    .about-partners {
        padding: 60px 0;
    }

    .about-history-timeline {
        padding-left: 40px;
    }

    .about-history-item {
        padding-left: 20px;
    }

    .about-history-year {
        left: -44px;
        width: 32px;
        height: 32px;
    }

    .about-history-year-text {
        font-size: 12px;
    }
}

@media (max-width: 567px) {
    .about-partners-grid {
        gap: 25px 30px;
    }

    .about-partner-item {
        padding: 12px 15px;
    }

    .about-partner-logo {
        max-width: 100px;
        max-height: 60px;
    }

    .about-partners-title {
        margin-bottom: 40px;
    }

    .about-vision-card,
    .about-mission-card {
        padding: 24px;
        margin-bottom: 24px;
    }

    .about-history-content {
        padding: 16px;
    }
}