.card {
    background: white; 
    padding: 24px;
    border-radius: 16px;                  /* 圆角边框 */
    max-width: 900px;
    margin: auto;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08); /* 阴影 */
    border: 1px solid #e5e7eb;           /* 可选，如果想更明显边框 */
}

/* ===========================================
   Header 区域 + 自适应头像 + 按钮
=========================================== */
.header {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    flex-wrap: wrap; /* PC端可换行 */
}

.profile-img {
    width: 100%;       /* 占容器宽度 */
    max-width: 150px;  /* PC端最大宽度 */
    height: auto;      /* 高度自适应 */
    border-radius: 12px;
    object-fit: cover;
    margin-bottom: 12px;
}

.header-text {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.subtitle {
    margin: 4px 0 8px 0;
}

/* 按钮容器 */
.header-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
    justify-content: flex-start; /* PC端靠左排列 */
}

/* 每个按钮及tooltip */
.header-buttons .tooltip {
    display: inline-block;
    position: relative;
    width: auto;
}

.header-buttons .btn-outline {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid #333;
    text-decoration: none;
    color: #333;
    transition: 0.2s;
    text-align: center;
}

.header-buttons .btn-outline:hover {
    background: #111;
    color: white;
    border-color: #111;
}

/* tooltip */
.tooltip .tooltiptext {
    visibility: hidden;
    width: auto;
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 4px 8px;
    border-radius: 6px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    white-space: nowrap;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* ===========================================
   Recent News 每条新闻间距
=========================================== */
.left-column .list li {
    margin-bottom: 12px; /* 每条新闻下方增加 12px 空隙，可调整 */
}
/* ===========================================
   Publications 样式
=========================================== */
.pub-list-adv {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pub-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 16px 12px;
    border-bottom: 1px solid #eee;
}

.pub-main {
    max-width: 75%;
}

.pub-title {
    display: block;
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 6px;
    color: #111;
}

.pub-authors {
    display: block;
    font-size: 13px;
    color: #555;
    margin-bottom: 4px;
}

.pub-venue {
    display: block;
    font-size: 13px;
    color: #888;
    font-style: italic;
}

.pub-links {
    display: flex;
    gap: 8px;
    margin-left: 10px;
}

.pub-btn {
    padding: 4px 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 12px;
    text-decoration: none;
    color: #333;
    transition: 0.2s;
}

.pub-btn:hover {
    background: #111;
    color: white;
    border-color: #111;
}

/* ===========================================
   响应式手机适配
=========================================== */
@media (max-width: 768px) {
    /* Header垂直排列 */
    .header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    /* 头像最大宽度 */
    .profile-img {
        max-width: 120px;
    }

    /* 按钮垂直排列，每个独占一行 */
    .header-buttons {
        flex-direction: column;
        width: 80%;
        margin: 8px auto 0 auto;
        align-items: center;
    }

    .header-buttons .tooltip {
        width: 100%;
        margin-bottom: 6px;
    }

    .header-buttons .btn-outline {
        width: 100%;
    }

    /* Publications 手机垂直排列 */
    .pub-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .pub-links {
        margin-top: 6px;
        margin-left: 0;
    }
}