/* 全局字体与背景 */
body {
    background-color: #f4f6f9; /* 柔和的灰蓝色背景 */
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #333;
}

/* 导航栏美化 */
.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    background: linear-gradient(90deg, #0d6efd 0%, #0a58ca 100%); /* 渐变蓝 */
}
.navbar-brand, .nav-link, .btn-link {
    color: #fff !important;
    font-weight: 500;
}
.navbar .btn-outline-light:hover {
    color: #0d6efd !important;
}

/* 卡片美化 */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    overflow: hidden;
}

/* 鼠标悬停卡片上浮效果 */
.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

/* 表格美化 */
.table thead th {
    background-color: #e9ecef;
    border-bottom: 2px solid #dee2e6;
    color: #495057;
}

/* 按钮微调 */
.btn {
    border-radius: 8px;
    padding: 8px 16px;
    font-weight: 500;
}

/* 登录页专用背景 */
.login-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
}