body {
    background: #f5f7fa;
    font-family: "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

.container-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 24px;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.page-header a {
    color: white;
    text-decoration: none;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    margin-bottom: 20px;
}

.card-header {
    background: white;
    border-bottom: 1px solid #f0f0f0;
    padding: 16px 20px;
    font-weight: 600;
    border-radius: 12px 12px 0 0 !important;
}

.table th {
    font-weight: 600;
    color: #555;
    border-top: none;
    background: #fafbfc;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

.status-未开始 { background: #e0e0e0; color: #616161; }
.status-进行中 { background: #fff3e0; color: #f57c00; }
.status-已完成 { background: #e8f5e9; color: #388e3c; }

.btn-action {
    padding: 4px 14px;
    font-size: 13px;
    border-radius: 6px;
    margin-right: 4px;
}

.modal-content {
    border-radius: 12px;
    border: none;
}

.modal-header {
    background: #f8f9fa;
    border-radius: 12px 12px 0 0;
}

.form-label {
    font-weight: 500;
    font-size: 14px;
    margin-bottom: 6px;
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    padding: 8px 12px;
}

.form-control:focus, .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.progress-bar {
    font-weight: bold;
}

.list-group-item {
    border-left: none;
    border-right: none;
}