/* 自定义样式 */
body {
    padding-top: 56px; /* 为固定的导航栏留出空间 */
    position: relative;
}

html {
    scroll-behavior: smooth; /* 实现平滑滚动 */
}

/* 头部英雄区域样式 */
.hero-section {
    padding: 100px 0;
    background: linear-gradient(rgba(40, 50, 70, 0.7), rgba(40, 50, 70, 0.7)), url('beijing-bg.jpg'); /* 使用一个北京相关的背景图, 并加上深色遮罩 */
    background-size: cover;
    background-position: center;
    color: white;
}

.hero-section h1 {
    font-weight: 700;
}

/* 区域标题通用样式 */
.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-weight: 300;
    font-size: 2.5rem;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #0d6efd; /* Bootstrap primary color */
}

/* 委员会副标题样式 */
.committee-subtitle {
    margin-top: 30px;
    margin-bottom: 20px;
    font-weight: 400;
    color: #343a40;
    border-left: 4px solid #0d6efd;
    padding-left: 15px;
}

/* 委员会成员卡片样式 */
.card {
    border: 1px solid #e9ecef;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.card small {
    color: #6c757d;
}

/* TPC 折叠列表样式 */
.accordion-button:not(.collapsed) {
    color: #0c63e4;
    background-color: #e7f1ff;
}