body {
    background-color: #f8f9fa;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 1rem;
}

.chat-messages {
    height: 300px;
    overflow-y: auto;
    border: 1px solid #dee2e6;
    border-radius: 0.25rem;
    padding: 1rem;
    background-color: #fff;
}

.chat-message {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.25rem;
}

.chat-message.user {
    background-color: #e3f2fd;
    text-align: right;
}

.chat-message.ai {
    background-color: #f5f5f5;
}

.navbar-brand {
    font-weight: bold;
}

.card-text {
    font-size: 1.25rem;
    font-weight: bold;
}

.table th {
    border-top: none;
    font-weight: 600;
}

#btcPrice {
    font-size: 1.5rem;
}

.pagination {
    justify-content: center;
}

/* 让卡片在移动端有更好的间距 */
.card .card-title { margin-bottom: .35rem; }

/* 更柔和的阴影与圆角 */
.card { border-radius: .5rem; }

/* navbar 轻阴影在主题中更显层次 */
.navbar { box-shadow: 0 1px 4px rgba(0,0,0,.06); }

/* 表头粘性兼容（若模板附带 table-sticky 类） */
.table-sticky thead th { position: sticky; top: 0; background: #fff; z-index: 1; }