body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    background-color: #f9f9f9;
    color: #333;
}

.header {
    background-color: #7a0019;
    color: white;
    padding: 40px 20px 20px;
    text-align: center;
}

.header h1 {
    margin: 0;
    font-size: 2rem;
}

.back-link {
    display: inline-block;
    margin-top: 10px;
    color: #ffcc33;
    text-decoration: none;
    font-size: 1rem;
}

.back-link:hover {
    text-decoration: underline;
}

main {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.committee-group {
    margin-bottom: 60px;
    clear: both;
}

.committee-group h3 {
    font-size: 1.5rem;
    color: #1a237e;
    border-left: 4px solid #1a237e;
    padding-left: 12px;
    margin-bottom: 24px;
}

.cards-container {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-top: 10px;
}

.committee-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    width: 260px;
    text-align: center;
    padding: 16px;
    box-sizing: border-box;
    transition: transform 0.3s;
}

.committee-card:hover {
    transform: translateY(-4px);
}

.committee-card img {
    width: 180px;               /* 调整头像大小，可根据需要修改 */
    height: 180px;
    object-fit: cover;
    border-radius: 50%;         /* 让头像变成圆形 */
    border: 4px solid white;    /* 白色圆环边框 */
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1); /* 可选：轻微阴影 */
    margin-bottom: 1rem;
}

.committee-card h4 {
    margin: 8px 0 4px;
    font-size: 1.1rem;
    color: #0d47a1;
}

.committee-card p {
    margin: 2px 0;
    font-size: 0.95rem;
    color: #555;
}

.committee-email {
    font-size: 0.85rem;
    color: var(--umn-maroon);
    margin-top: 4px;
    word-break: break-all;
}

.committee-email a {
    color: var(--umn-maroon);
    text-decoration: none;
}

.committee-email a:hover {
    text-decoration: underline;
}

#backToTop {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: #7a0019;
    color: #ffcc33;
    cursor: pointer;
    padding: 10px 16px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

#backToTop:hover {
    background-color: #ffcc33;
    color: #7a0019;
}

@media (max-width: 768px) {
    .committee-group {
        flex-direction: column;
        align-items: center;
    }

    .committee-card {
        width: 90%;
        max-width: 300px;
        margin: 10px 0;
    }
}