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

.container {
    max-width: 1000px;
}

header h1 {
    color: #2c3e50;
    font-weight: 600;
}

.card {
    border-radius: 10px;
    border: none;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1) !important;
}

.btn-primary {
    background-color: #3498db;
    border-color: #3498db;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

.form-control:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
}

#result {
    transition: all 0.3s ease;
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

footer {
    font-size: 0.9rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    header {
        margin-top: 2rem !important;
        margin-bottom: 2rem !important;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group .form-control {
        border-radius: 0.375rem !important;
        margin-bottom: 0.5rem;
    }
    
    .input-group .btn {
        border-radius: 0.375rem !important;
        width: 100%;
    }
}