/* 基础变量与重置 */
:root {
    --primary-color: #0b164a;
    --accent-color: #1a73e8;
    --text-main: #333333;
    --text-light: #666666;
    --bg-gray: #f8f9fa;
    --border-color: #eaeaea;
}

/* 修改为单列布局 */
.speakers-grid {
    display: flex;
    flex-direction: column;
    gap: 30px; /* 卡片之间的间距稍微拉大 */
    margin-bottom: 40px;
}

/* 成员卡片 - Flex 布局 */
.speaker-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px; /* 单列卡片圆角可以稍微大一点 */
    padding: 30px; /* 内边距增大 */
    display: flex;
    gap: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    align-items: flex-start;
}

    .speaker-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }

/* 成员图片 */
.speaker-photo {
    flex-shrink: 0;
    width: 180px; /* 单列布局下，图片可以进一步放大 */
    height: 220px;
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--bg-gray);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

    .speaker-photo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }

/* 文字内容区 */
.speaker-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.speaker-name {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 4px;
    font-weight: bold;
}

.speaker-affiliation {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 16px;
}

/* 折叠功能核心 CSS */
.speaker-bio {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7; /* 单列布局行长增加，行高调大更易读 */
    /* 默认限制显示 4 行 */
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: all 0.3s ease;
}

    /* 展开状态：取消行数限制 */
    .speaker-bio.expanded {
        display: block;
        -webkit-line-clamp: unset;
    }

    .speaker-bio strong {
        color: var(--text-main);
        font-weight: 600;
    }

/* 展开/收起按钮 */
.toggle-btn {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--accent-color);
    cursor: pointer;
    font-weight: bold;
    background: none;
    border: none;
    padding: 0;
    text-align: left;
    transition: color 0.2s;
}

    .toggle-btn:hover {
        color: var(--primary-color);
        text-decoration: underline;
    }

/* 移动端适配 */
@media (max-width: 768px) {
    .top-bar .container {
        flex-direction: column;
        text-align: center;
    }

    .page-title {
        font-size: 1.6rem;
        padding: 30px 0 15px;
    }

    .speaker-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 20px;
    }

    .speaker-photo {
        width: 150px;
        height: 190px;
        margin-bottom: 16px;
    }

    .speaker-info {
        align-items: center; /* 居中名字和头衔 */
        width: 100%;
    }

    .speaker-bio {
        text-align: left; /* 简介长文在手机端保持左对齐更好读 */
        margin-top: 12px;
        width: 100%;
    }

    .toggle-btn {
        text-align: left;
        width: 100%;
    }
}