/* 自定义样式 */
body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar-brand {
    font-weight: 600;
}

.card {
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    border: none;
}

.card-header {
    background-color: #4e73df;
    color: white;
    border-radius: 10px 10px 0 0 !important;
    padding: 15px 20px;
}

.btn-primary {
    background-color: #4e73df;
    border-color: #4e73df;
}

.btn-primary:hover {
    background-color: #3a5bbf;
    border-color: #3a5bbf;
}

.assignment-list {
    list-style-type: none;
    padding-left: 0;
}

.assignment-list li {
    padding: 10px 15px;
    border-bottom: 1px solid #eee;
    transition: background-color 0.2s;
}

.assignment-list li:hover {
    background-color: #f8f9fa;
}

.assignment-list li:last-child {
    border-bottom: none;
}

.login-container {
    max-width: 500px;
    margin: 0 auto;
    padding-top: 50px;
}

.upload-area {
    border: 2px dashed #ddd;
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 20px;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: #4e73df;
    background-color: #f8faff;
}

.day-badge {
    font-size: 1.1rem;
    padding: 8px 15px;
    background-color: #4e73df;
}

/* 筛选表单样式 */
.filter-card {
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.filter-card .card-header {
    background-color: #f8f9fa;
    color: #495057;
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .filter-form .col-md-4 {
        margin-bottom: 15px;
    }
}

/* 删除模态框样式 */
#deleteModal .modal-header {
    border-bottom: none;
  }
  
  #deleteModal .modal-footer {
    border-top: none;
    justify-content: space-between;
  }
  
  #deleteModal .btn-danger {
    background-color: #dc3545;
    border-color: #dc3545;
  }
  
  #deleteModal .btn-danger:hover {
    background-color: #bb2d3b;
    border-color: #bb2d3b;
  }