/* 按钮 */
.btn-primary {
    background: #007bff;
    color: #fff !important;
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 14px;
}
.btn-primary:hover {
    background: #0069d9;
}

/* 语言按钮 */
.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 5px 12px;
    margin-left: 8px;
    background: #fff;
    color: #333;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.2s;
}
.lang-btn:hover {
    background: #f5f5f5;
    border-color: #ccc;
}

/* 卡片 */
.card {
    background: #fff;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    transition: transform 0.2s;
}
.card:hover {
    transform: translateY(-3px);
}